diff --git a/index.html b/index.html
index 99ed87b..d1cf3e7 100644
--- a/index.html
+++ b/index.html
@@ -30,7 +30,6 @@
 </head>
 
 <body>
-
 	<!-- <body oncontextmenu="return false"> -->
 	<div id='guns'></div>
 	<div id='field'></div>
@@ -77,34 +76,82 @@
 	<canvas id="canvas"></canvas>
 	<!-- **********  intro page ***********************************************
 ******************************************************************************* -->
+
+	<!-- <div id="build-details">
+		<div class="build-grid-module"></div>
+		<details>
+			<summary>build</summary>
+			<div id="details-div">
+
+			</div>
+		</details>
+	</div> -->
+	<div id="build-grid">
+
+	</div>
+	<button type="button" id="build-button">builds</button>
+
+
+
+	<!-- <div id="build">
+		<details>
+			<summary>builds</summary>
+
+		</details>
+	</div> -->
+
+
 	<div id="controls">
 		<details>
-			<summary>info</summary>
+			<summary>about</summary>
 			<div id="details-div">
+				<div style="line-height: 150%;">
+					<label for="difficulty-select" title="effects: number of mobs, damage done by mobs, damage done to mobs, mob speed">combat difficulty:</label>
+					<select name="difficulty-select" id="difficulty-select">
+						<option value="easy">easy</option>
+						<option value="0" selected>normal</option>
+						<option value="4">hard</option>
+						<option value="8">why...</option>
+					</select>
+					<br>
+					<label for="body-damage" title="allow damage from heavy, fast moving blocks">collision damage from blocks:</label>
+					<input type="checkbox" id="body-damage" name="body-damage" checked style="width:16px; height:16px;">
+					<br>
+					<label for="fps-select" title="use this to slow the game down">frames per second cap:</label>
+					<select name="fps-select" id="fps-select">
+						<option value="max">no fps cap</option>
+						<option value="72" selected>72 fps cap</option>
+						<option value="60">60 fps cap</option>
+						<option value="45">45 fps cap</option>
+						<option value="30">30 fps cap</option>
+					</select>
+				</div>
+				<br><br>
+
 				<table>
 					<tr>
-						<td>FIRE</td>
+						<th>FIRE</th>
 						<td>left mouse</td>
 						<td></td>
 					</tr>
 					<tr>
-						<td>FIELD</td>
+						<th>FIELD</th>
 						<td>right mouse / spacebar</td>
 					</tr>
 					<tr>
-						<td>MOVE</td>
+						<th>MOVE</th>
 						<td>WASD / arrows</td>
 					</tr>
 					<tr>
-						<td>GUNS</td>
+						<th>GUNS</th>
 						<td>Q / E / mouse wheel</td>
 					</tr>
 					<tr>
-						<td>ZOOM</td>
+						<th>ZOOM</th>
 						<td>+ / -</td>
 					</tr>
 					<tr>
-						<td>PAUSE</td>
+						<th>PAUSE</th>
 						<td>P</td>
 					</tr>
 					<!-- <tr>
@@ -140,35 +187,9 @@
 				<a href="https://github.com/landgreen/n-gon">Github</a> hosts the source code for n-gon.<br> It's written in JavaScript, CSS, and HTML.
 				<br>
 				<br>
-				N-gon is also on <a href="https://lilgreenland.itch.io/n-gon">itch.io</a>.
+				n-gon is also hosted at <a href="https://lilgreenland.itch.io/n-gon">itch.io</a>.
+				<br>
 				<br>
-			</div>
-		</details>
-	</div>
-
-	<div id="settings">
-		<details>
-			<summary>settings</summary>
-			<div id="details-div">
-				<label for="body-damage" title="allow damage from heavy, fast moving blocks">block collision damage:</label>
-				<input type="checkbox" id="body-damage" name="body-damage" checked>
-				<br><br>
-				<label for="difficulty-select" title="effects: number of mobs, damage done by mobs, damage done to mobs, mob speed">combat difficulty:</label>
-				<select name="difficulty-select" id="difficulty-select">
-					<option value="easy">easy</option>
-					<option value="0" selected>normal</option>
-					<option value="4">hard</option>
-					<option value="8">why...</option>
-				</select>
-				<br><br>
-				<label for="fps-select" title="use this to slow the game down">FPS cap:</label>
-				<select name="fps-select" id="fps-select">
-					<option value="max">no fps cap</option>
-					<option value="72" selected>72 fps cap</option>
-					<option value="60">60 fps cap</option>
-					<option value="45">45 fps cap</option>
-					<option value="30">30 fps cap</option>
-				</select>
 			</div>
 		</details>
 	</div>
diff --git a/js/bullets.js b/js/bullets.js
index ccf2d1b..eedebab 100644
--- a/js/bullets.js
+++ b/js/bullets.js
@@ -19,7 +19,12 @@ const b = {
   modExtraDmg: null,
   annihilation: null,
   fullHeal: null,
-  modSquirrelFx: 1,
+  modSquirrelFx: null,
+  modIsCrit: null,
+  modMoreDrops: null,
+  isModLowHealthDmg: null,
+  isModFarAwayDmg: null,
+  isModMonogamy: null,
   setModDefaults() {
     b.modCount = 0;
     b.modFireRate = 1;
@@ -37,6 +42,11 @@ const b = {
     b.modAnnihilation = false;
     b.isModFullHeal = false;
     b.modSquirrelFx = 1;
+    b.modIsCrit = false;
+    b.modMoreDrops = 0;
+    b.isModLowHealthDmg = false;
+    b.isModFarAwayDmg = false;
+    b.isModMonogamy = false;
     mech.Fx = 0.015;
     mech.jumpForce = 0.38;
     mech.throwChargeRate = 2;
@@ -47,17 +57,17 @@ const b = {
   },
   mods: [{
       name: "depleted uranium rounds",
-      description: "your <strong class='color-b'>bullets</strong> are larger and do more physical <span class='color-d'>damage</span>",
+      description: "your <strong>bullets</strong> are 10% larger<br>increased momentum and physical <strong class='color-d'>damage</strong>",
       have: false, //0
       effect: () => {
         //good for guns that do mostly projectile damage:
         //testing at 1.08:  spray(point blank)(+0.25), one shot(+0.16), wave beam(point blank)(+0.14)
-        b.modBulletSize = 1.07;
+        b.modBulletSize = 1.1;
       }
     },
     {
       name: "auto-loading heuristics",
-      description: "your rate of fire is 15% higher",
+      description: "your <strong>rate of fire</strong> is 15% higher",
       have: false, //1
       effect: () => { //good for guns with extra ammo: needles, M80, rapid fire, flak, super balls
         b.modFireRate = 0.85
@@ -65,7 +75,7 @@ const b = {
     },
     {
       name: "desublimated ammunition",
-      description: "use 50% less <strong class='color-b'>ammo</strong> when <strong>crouching</strong>",
+      description: "use 50% less <strong>ammo</strong> when <strong>crouching</strong>",
       have: false, //2
       effect: () => { //good with guns that have less ammo: one shot, grenades, missiles, super balls, spray
         b.modNoAmmo = 1
@@ -73,7 +83,7 @@ const b = {
     },
     {
       name: "Lorentzian topology",
-      description: "your <strong class='color-b'>bullets</strong> last 40% longer",
+      description: "your <strong>bullets</strong> last 40% <strong>longer</strong>",
       have: false, //3
       effect: () => { //good with: drones, super balls, spore, missiles, wave beam(range), rapid fire(range), flak(range)
         b.isModBulletsLastLonger = 1.40
@@ -81,7 +91,7 @@ const b = {
     },
     {
       name: "anti-matter cores",
-      description: "the radius of your <strong class='color-e'>explosions</strong> is doubled<br><span style='opacity:0.3;'>be careful</span>",
+      description: "the <strong>radius</strong> of your <strong class='color-e'>explosions</strong> is doubled<br><strong style='opacity:0.3;'>be careful</strong>",
       have: false, //4
       effect: () => { //at 1.4 gives a flat 40% increase, and increased range,  balanced by limited guns and self damage
         //testing at 1.3: grenade(+0.3), missiles, flak, M80
@@ -90,7 +100,7 @@ const b = {
     },
     {
       name: "ceramic plating",
-      description: "you take no damage from area effects<br>immune to <strong class='color-e'>explosions</strong> and enemy fields",
+      description: "<strong>immune</strong> to <strong class='color-e'>explosions</strong> and enemy fields",
       have: false, //5
       effect: () => {
         b.isModAoEImmunity = true; //good for guns with explosions
@@ -98,7 +108,7 @@ const b = {
     },
     {
       name: "ablative synthesis",
-      description: "after taking <span class='color-d'>damage</span>, there is a chance that your damaged parts will be rebuilt as <strong class='color-b'>drones</strong>",
+      description: "rebuild your broken parts as <strong>drones</strong><br>chance to occur after taking <strong class='color-d'>damage</strong>",
       have: false, //6
       effect: () => { //makes dangerous situations more survivable
         b.isModDroneOnDamage = true;
@@ -106,7 +116,7 @@ const b = {
     },
     {
       name: "zoospore vector",
-      description: "when an enemy <span style='color: #888;'>dies</span> it has a 20% chance to release <strong class='color-s'>spores</strong>",
+      description: "enemies can discharge <strong class='color-s'>spores</strong> on <strong>death</strong><br><strong class='color-s'>spores</strong> seek out enemies",
       have: false, //7
       effect: () => { //good late game maybe?
         b.modSpores = 0.20;
@@ -114,16 +124,15 @@ const b = {
     },
     {
       name: "field siphon",
-      description: "regenerate <span class='color-f'>field energy</span> proportional to your <span class='color-d'>damage</span> done",
+      description: "gain <strong class='color-f'>energy</strong> proportional to <strong class='color-d'>damage</strong> done",
       have: false, //8
       effect: () => { //good with laser, and all fields
-
-        b.modEnergySiphon = 0.2;
+        b.modEnergySiphon = 0.15;
       }
     },
     {
       name: "entropy transfer",
-      description: "<span class='color-h'>heal</span> proportional to your <span class='color-d'>damage</span> done",
+      description: "<strong class='color-h'>heal</strong> proportional to <strong class='color-d'>damage</strong> done",
       have: false, //9
       effect: () => { //good with guns that overkill: one shot, grenade
         b.modHealthDrain = 0.01;
@@ -131,7 +140,7 @@ const b = {
     },
     {
       name: "quantum immortality",
-      description: "after you <strong style='color: #606;'>die</strong> continue in an <em>alternate reality</em><br>guns, ammo, and field are randomized",
+      description: "after <strong>dying</strong>, continue in an <em>alternate reality</em><br>guns, ammo, and field are randomized",
       have: false, //10
       effect: () => {
         b.modIsImmortal = true;
@@ -139,7 +148,7 @@ const b = {
     },
     {
       name: "fluoroantimonic acid",
-      description: "your bullets do extra chemical <span class='color-d'>damage</span> each time they make contact",
+      description: "each bullet does extra chemical <strong class='color-d'>damage</strong>",
       have: false, //11
       effect: () => { //good with guns that fire many bullets at low speeds, minigun, drones, junk-bots, shotgun, superballs, wavebeam
         b.modExtraDmg = 0.1
@@ -147,7 +156,7 @@ const b = {
     },
     {
       name: "annihilation",
-      description: "after you touch any enemy, they are <strong class='color-l'>annihilated</strong><br><em>touching enemies <span class='color-d'>damages</span> you, but <span class='color-d'>destroys</span> them</em>",
+      description: "after <strong>touching</strong> enemies, they are annihilated",
       have: false, //12
       effect: () => { //good with mods that heal: superconductive healing, entropy transfer 
         b.modAnnihilation = true
@@ -155,17 +164,16 @@ const b = {
     },
     {
       name: "recursive healing",
-      description: "<span class='color-h'>heals</span> bring you to full health",
+      description: "<strong class='color-h'>healing</strong> power ups bring you to <strong>full health</strong>",
       have: false, //13
-      effect: () => { // good with ablative synthesis, electrostatic field
-        b.isModFullHeal = true
+      effect: () => { // good with ablative synthesis, melee builds
       }
     },
     {
       name: "Gauss rifle",
-      description: "<span style='color:#f0f;'>magnetically</span> <strong>launch blocks</strong> at much higher speeds<br>carry more massive blocks<br><em>hold right click to charge up a throw and release to fire</em>",
+      description: "<strong>launch blocks</strong> at much higher speeds<br>carry more massive blocks",
       have: false, //14
-      effect: () => { // good with ablative synthesis, electrostatic field
+      effect: () => { // good with guns that run out of ammo
         b.isModFullHeal = true
         mech.throwChargeRate = 4;
         mech.throwChargeMax = 150;
@@ -174,15 +182,54 @@ const b = {
     },
     {
       name: "squirrel-cage rotor",
-      description: "jump higher and move faster",
+      description: "your legs produce 20% more force<br><strong>jump</strong> higher and <strong>move</strong> faster",
       have: false, //15
-      effect: () => { // 
+      effect: () => { // good with melee builds, content skipping builds
         b.modSquirrelFx = 1.2;
         mech.Fx = 0.015 * b.modSquirrelFx;
         mech.jumpForce = 0.38 * 1.1;
       }
     },
-
+    {
+      name: "fracture analysis",
+      description: "<strong>6x</strong> physical <strong class='color-d'>damage</strong> to unaware enemies<br><em>enemies aware of you have a health bar</em>",
+      have: false, //16
+      effect: () => { // good with high damage guns that strike from a distance: rail gun, drones, flechettes, spores, grenade, vacuum bomb
+        b.modIsCrit = true;
+      }
+    },
+    {
+      name: "kinetic bombardment",
+      description: "do extra <strong class='color-d'>damage</strong> from farther away<br><em>up to 50% increase at about 30 steps away</em>",
+      have: false, //17
+      effect: () => { // good with annihilation, melee builds
+        b.isModFarAwayDmg = true; //used in mob.damage()
+      }
+    },
+    {
+      name: "quasistatic equilibrium",
+      description: "do extra <strong class='color-d'>damage</strong> at low health<br><em>up to 50% increase when near death</em>",
+      have: false, //18
+      effect: () => { // good with annihilation, melee builds
+        b.isModLowHealthDmg = true; //used in mob.damage()
+      }
+    },
+    {
+      name: "Bayesian inference",
+      description: "<strong>20%</strong> chance for double <strong>power ups</strong> to drop",
+      have: false, //19
+      effect: () => { // good with long term planning
+        b.modMoreDrops = 0.20;
+      }
+    },
+    {
+      name: "monogamy",
+      description: "equipping your first gun reduces <strong class='color-d'>damage</strong> taken<br>scales by <strong>7%</strong> for each gun in your inventory",
+      have: false, //20
+      effect: () => { // good with long term planning
+        b.isModMonogamy = true
+      }
+    },
   ],
   giveMod(i) {
     b.mods[i].effect(); //give specific mod
@@ -226,7 +273,7 @@ const b = {
         }
       } else {
         mech.fireCDcycle = mech.cycle + 30; //cooldown
-        // game.makeTextLog("<div style='font-size:140%;'>NO AMMO</div><span class = 'box'>E</span> / <span class = 'box'>Q</span>", 200);
+        // game.makeTextLog("<div style='font-size:140%;'>NO AMMO</div><strong class = 'box'>E</strong> / <strong class = 'box'>Q</strong>", 200);
         game.replaceTextLog = true;
         game.makeTextLog("<div style='font-size:140%;'>NO AMMO</div> <p style='font-size:90%;'><strong>Q</strong>, <strong>E</strong>, and <strong>mouse wheel</strong> change weapons</p>", 200);
       }
@@ -496,7 +543,7 @@ const b = {
   },
   guns: [{
       name: "laser", //0
-      description: "fire a  <span style='color:#f00;'>beam</span> of coherent light<br>reflects off walls at 75% intensity<br>uses  <span class='color-f'>energy</span> instead of ammunition",
+      description: "emit a beam of <strong class='color-d'>damaging</strong> coherent light<br>uses  <strong class='color-f'>energy</strong> instead of ammunition",
       ammo: 0,
       // ammoPack: 350,
       ammoPack: Infinity,
@@ -658,17 +705,18 @@ const b = {
     },
     {
       name: "rail gun", //1
-      description: "<strong>hold left mouse</strong> to charge and release to fire<br>charging repels small enemies<br><em>crouching charges quicker and reduces recoil</em>",
+      description: "magnetically launch a dense rod<br><strong>hold left mouse</strong> to charge and <strong>repel</strong> enemies",
       ammo: 0,
       ammoPack: 12,
       have: false,
       isStarterGun: false,
       fire() {
         const me = bullet.length;
-        bullet[me] = Bodies.rectangle(9, -90, 0.01 * b.modBulletSize, 0.0017 * b.modBulletSize, {
-          // density: 0.0015,			//frictionAir: 0.01,			//restitution: 0,
-          angle: 0,
-          friction: 0.5,
+        bullet[me] = Bodies.rectangle(0, 0, 0.012 * b.modBulletSize, 0.0022 * b.modBulletSize, {
+          density: 0.002, //0.001 is normal
+          //frictionAir: 0.01,			//restitution: 0,
+          // angle: 0,
+          // friction: 0.5,
           frictionAir: 0,
           dmg: 3 + b.modExtraDmg, //damage done in addition to the damage from momentum
           classType: "bullet",
@@ -698,7 +746,7 @@ const b = {
                 y: mech.pos.y
               })
               Matter.Body.setAngle(this, mech.angle)
-              const speed = 80
+              const speed = 85
               Matter.Body.setVelocity(this, {
                 x: mech.Vx / 2 + speed * this.charge * Math.cos(mech.angle),
                 y: mech.Vy / 2 + speed * this.charge * Math.sin(mech.angle)
@@ -714,6 +762,7 @@ const b = {
               for (let i = 0, len = body.length; i < len; ++i) {
                 const SUB = Matter.Vector.sub(body[i].position, mech.pos)
                 const DISTANCE = Matter.Vector.magnitude(SUB)
+
                 if (DISTANCE < RANGE) {
                   const DEPTH = Math.max(RANGE - DISTANCE, 100)
                   const FORCE = Matter.Vector.mult(Matter.Vector.normalise(SUB), 0.005 * Math.sqrt(DEPTH) * Math.sqrt(body[i].mass))
@@ -732,8 +781,6 @@ const b = {
               //     mob[i].force.y += FORCE.y
               //   }
               // }
-
-
             } else { // charging on mouse down
               mech.fireCDcycle = Infinity //can't fire until mouse is released
               if (mech.crouch) {
@@ -750,7 +797,9 @@ const b = {
                 // if (DISTANCE < RANGE) {
                 //   Matter.Body.setVelocity(mob[i], Matter.Vector.rotate(mob[i].velocity, 0.1))
                 // }
+                // const DRAIN = 0.0002  //&& mech.fieldMeter > DRAIN
                 if (DISTANCE < RANGE) {
+                  // mech.fieldMeter -= DRAIN + mech.fieldRegen;
                   const DEPTH = RANGE - DISTANCE
                   const FORCE = Matter.Vector.mult(Matter.Vector.normalise(SUB), 0.000000001 * DEPTH * DEPTH * DEPTH * Math.sqrt(mob[i].mass))
                   mob[i].force.x += FORCE.x
@@ -894,7 +943,7 @@ const b = {
       }
     }, {
       name: "wave beam", //3
-      description: "fire a stream of oscillating particles<br><strong style='opacity: 0.4;'>propagates through solids</strong>",
+      description: "fire a stream of oscillating particles<br>bullets <strong>propagate</strong> through solids",
       ammo: 0,
       ammoPack: 85,
       have: false,
@@ -947,7 +996,7 @@ const b = {
       }
     }, {
       name: "super balls", //4
-      description: "fire 3 very <strong>bouncy</strong> balls",
+      description: "fire balls that <strong>bounce</strong> with no momentum loss",
       ammo: 0,
       ammoPack: 11,
       have: false,
@@ -975,7 +1024,7 @@ const b = {
       }
     }, {
       name: "shotgun", //5
-      description: "fire a <strong>burst</strong> of bullets<br><em>crouch to reduce recoil</em>",
+      description: "fire a <strong>burst</strong> of short range bullets<br><em>crouch to reduce recoil</em>",
       ammo: 0,
       ammoPack: 8,
       have: false,
@@ -1003,7 +1052,7 @@ const b = {
       }
     }, {
       name: "fléchettes", //6
-      description: "fire accurate high speed needles",
+      description: "fire a flight of needles<br><strong>accurate</strong> at long range",
       ammo: 0,
       ammoPack: 25,
       have: false,
@@ -1038,7 +1087,7 @@ const b = {
       }
     }, {
       name: "missiles", //7
-      description: "fire a missile that accelerates towards nearby targets<br><span class='color-e'>explodes</span> when near target",
+      description: "fire missiles that accelerate towards enemies<br><strong class='color-e'>explodes</strong> when near target",
       ammo: 0,
       ammoPack: 8,
       have: false,
@@ -1143,7 +1192,7 @@ const b = {
       }
     }, {
       name: "flak", //8
-      description: "fire a cluster of short range projectiles<br><span class='color-e'>explode</span> on contact or after half a second",
+      description: "fire a cluster of short range projectiles<br><strong class='color-e'>explode</strong> on contact or after half a second",
       ammo: 0,
       ammoPack: 20,
       have: false,
@@ -1186,7 +1235,7 @@ const b = {
       }
     }, {
       name: "grenades", //9
-      description: "fire a projectile that <span class='color-e'>explodes</span> on contact or after one second",
+      description: "lob a single bouncy projectile<br><strong class='color-e'>explodes</strong> on contact or after one second",
       ammo: 0,
       ammoPack: 9,
       have: false,
@@ -1214,7 +1263,7 @@ const b = {
       }
     }, {
       name: "vacuum bomb", //10
-      description: "fire a huge <strong>bomb</strong> that sucks before it <span class='color-e'>explodes</span><br>click left mouse <strong>again</strong> to detonate",
+      description: "fire a bomb that <strong>sucks</strong> before <strong class='color-e'>exploding</strong><br>click left mouse again to <strong>detonate</strong>",
       ammo: 0,
       ammoPack: 5,
       have: false,
@@ -1323,7 +1372,7 @@ const b = {
       }
     }, {
       name: "ferro frag", //11
-      description: "fire a <strong>grenade</strong> that ejects <strong class='color-m'>magnetized</strong> nails<br>nails are <strong class='color-m'>attracted</strong> to enemy targets",
+      description: "fire a <strong>grenade</strong> that ejects magnetized nails<br>nails are <strong>attracted</strong> to enemies",
       ammo: 0,
       ammoPack: 8,
       have: false,
@@ -1348,38 +1397,42 @@ const b = {
               //target nearby mobs
               const targets = []
               for (let i = 0, len = mob.length; i < len; i++) {
-                const sub = Matter.Vector.sub(this.position, mob[i].position);
-                const dist = Matter.Vector.magnitude(sub);
-                if (dist < 1400 &&
-                  Matter.Query.ray(map, this.position, mob[i].position).length === 0 &&
-                  Matter.Query.ray(body, this.position, mob[i].position).length === 0) {
-                  targets.push(mob[i].position)
+                if (mob[i].dropPowerUp) {
+                  const sub = Matter.Vector.sub(this.position, mob[i].position);
+                  const dist = Matter.Vector.magnitude(sub);
+                  if (dist < 1400 &&
+                    Matter.Query.ray(map, this.position, mob[i].position).length === 0 &&
+                    Matter.Query.ray(body, this.position, mob[i].position).length === 0) {
+                    targets.push(
+                      Matter.Vector.add(mob[i].position, Matter.Vector.mult(mob[i].velocity, dist / 60))
+                    )
+                  }
                 }
               }
               for (let i = 0; i < 14; i++) {
-                const SPEED = 35 + 20 * Math.random()
+                const speed = 55 + 10 * Math.random()
                 if (targets.length > 0) { // aim near a random target
-                  const SPREAD = 100
-                  const INDEX = Math.floor(Math.random() * targets.length)
+                  const index = Math.floor(Math.random() * targets.length)
+                  const SPREAD = 150 / targets.length
                   const WHERE = {
-                    x: targets[INDEX].x + SPREAD * (Math.random() - 0.5),
-                    y: targets[INDEX].y + SPREAD * (Math.random() - 0.5)
+                    x: targets[index].x + SPREAD * (Math.random() - 0.5),
+                    y: targets[index].y + SPREAD * (Math.random() - 0.5)
                   }
-                  needle(this.position, Matter.Vector.mult(Matter.Vector.normalise(Matter.Vector.sub(WHERE, this.position)), SPEED))
+                  needle(this.position, Matter.Vector.mult(Matter.Vector.normalise(Matter.Vector.sub(WHERE, this.position)), speed))
                 } else { // aim in random direction
                   const ANGLE = 2 * Math.PI * Math.random()
                   needle(this.position, {
-                    x: SPEED * Math.cos(ANGLE),
-                    y: SPEED * Math.sin(ANGLE)
+                    x: speed * Math.cos(ANGLE),
+                    y: speed * Math.sin(ANGLE)
                   })
                 }
 
                 function needle(pos, velocity) {
                   const me = bullet.length;
-                  bullet[me] = Bodies.rectangle(pos.x, pos.y, 23 * b.modBulletSize, 2 * b.modBulletSize, b.fireAttributes(Math.atan2(velocity.y, velocity.x)));
+                  bullet[me] = Bodies.rectangle(pos.x, pos.y, 25 * b.modBulletSize, 2 * b.modBulletSize, b.fireAttributes(Math.atan2(velocity.y, velocity.x)));
                   Matter.Body.setVelocity(bullet[me], velocity);
                   World.add(engine.world, bullet[me]); //add bullet to world
-                  bullet[me].endCycle = game.cycle + 60 + Math.floor(15 * Math.random());
+                  bullet[me].endCycle = game.cycle + 60 + 15 * Math.random();
                   // bullet[me].dmg = 1.1+b.modExtraDmg;
                   bullet[me].do = function () {};
                 }
@@ -1390,7 +1443,7 @@ const b = {
       }
     }, {
       name: "spores", //12
-      description: "release an orb that discharges <span class='color-s'>spores</span> after 2 seconds<br>seeks out targets<br>passes through blocks",
+      description: "fire orbs that discharge <strong class='color-s'>spores</strong><br><strong class='color-s'>spores</strong> seek out enemies",
       ammo: 0,
       ammoPack: 5,
       have: false,
@@ -1491,9 +1544,10 @@ const b = {
         }
 
       }
-    }, {
+    },
+    {
       name: "drones", //13
-      description: "release <strong>drones</strong> that seek out targets for 16 seconds<br>follows mouse if no targets are found",
+      description: "fire <strong>drones</strong> that seek out enemies<br>follows mouse if no targets are found",
       ammo: 0,
       ammoPack: 20,
       have: false,
@@ -1664,7 +1718,7 @@ const b = {
     // },
     // {
     //   name: "kinetic slugs", //1
-    //   description: "fire a large <strong>rod</strong> that does excessive physical <span class='color-d'>damage</span><br><em>high recoil</em>",
+    //   description: "fire a large <strong>rod</strong> that does excessive physical <strong class='color-d'>damage</strong><br><em>high recoil</em>",
     //   ammo: 0,
     //   ammoPack: 5,
     //   have: false,
@@ -1686,7 +1740,7 @@ const b = {
     //     player.force.x -= KNOCK * Math.cos(dir)
     //     player.force.y -= KNOCK * Math.sin(dir) * 0.3 //reduce knock back in vertical direction to stop super jumps
     //   },
-    //  {
+    // {
     //   name: "triboelectricty", //14
     //   description: "release <strong>particles</strong> that quickly seek out targets",
     //   ammo: 0,
@@ -1754,7 +1808,7 @@ const b = {
     // {
     //   //draw a halo, since there will only be 1-3 balls
     //   name: "junk-bots", //14
-    //   description: "release unreliable <strong>drones</strong> that defend the space around the player<br><strong>collisions</strong> may cause <span class='color-d'>malfunction</span>",
+    //   description: "release unreliable <strong>drones</strong> that defend the space around the player<br><strong>collisions</strong> may cause <strong class='color-d'>malfunction</strong>",
     //   ammo: 0,
     //   ammoPack: 15,
     //   have: false,
diff --git a/js/engine.js b/js/engine.js
index 511397e..e0651d0 100644
--- a/js/engine.js
+++ b/js/engine.js
@@ -177,9 +177,10 @@ function mobCollisionChecks(event) {
           }
           //mob + bullet collisions
           if (obj.classType === "bullet" && obj.speed > obj.minDmgSpeed) {
-            mob[k].foundPlayer();
             // const dmg = b.dmgScale * (obj.dmg + 0.15 * obj.mass * Matter.Vector.magnitude(Matter.Vector.sub(mob[k].velocity, obj.velocity)));
-            const dmg = b.dmgScale * (obj.dmg + b.modExtraDmg + 0.15 * obj.mass * Matter.Vector.magnitude(Matter.Vector.sub(mob[k].velocity, obj.velocity)))
+            let dmg = b.dmgScale * (obj.dmg + b.modExtraDmg + 0.15 * obj.mass * Matter.Vector.magnitude(Matter.Vector.sub(mob[k].velocity, obj.velocity)))
+            if (b.modIsCrit && !mob[k].seePlayer.recall) dmg *= 6
+            mob[k].foundPlayer();
             mob[k].damage(dmg);
             obj.onDmg(); //some bullets do actions when they hits things, like despawn
             game.drawList.push({
diff --git a/js/game.js b/js/game.js
index dab8045..d3c7893 100644
--- a/js/game.js
+++ b/js/game.js
@@ -454,7 +454,9 @@ const game = {
       game.startGame();
     };
     document.getElementById("controls").style.display = "inline";
-    document.getElementById("settings").style.display = "inline";
+    document.getElementById("build-button").style.display = "inline"
+    isShowingBuilds = false
+    // document.getElementById("settings").style.display = "inline";
     document.getElementById("splash").style.display = "inline";
     document.getElementById("dmg").style.display = "none";
     document.getElementById("health-bg").style.display = "none";
@@ -464,8 +466,10 @@ const game = {
   then: null,
   startGame() {
     game.onTitlePage = false;
+    document.body.style.overflow = "hidden"
+    document.getElementById("build-grid").style.display = "none"
     document.getElementById("controls").style.display = "none";
-    document.getElementById("settings").style.display = "none";
+    document.getElementById("build-button").style.display = "none";
     document.getElementById("splash").onclick = null; //removes the onclick effect so the function only runs once
     document.getElementById("splash").style.display = "none"; //hides the element that spawned the function
     document.getElementById("dmg").style.display = "inline";
diff --git a/js/index.js b/js/index.js
index 602df49..1754156 100644
--- a/js/index.js
+++ b/js/index.js
@@ -2,6 +2,15 @@
 /* TODO:  *******************************************
 *****************************************************
 
+add builds with combinations of gun, field and mobs
+  use the pull down menu
+
+dynamically generate html about fields, guns and mods
+
+add grid check to improve queries over large body arrays
+  something about broad phase
+  having trouble with this, might give up
+
 gun: like drones, but fast moving and short lived
   dies after doing damage
 
@@ -12,31 +21,16 @@ gun:  Spirit Bomb (singularity)
     sucked in stuff increase size
   uses energy
 
-left and right click mouse icons for text displays
-
 mod: auto pick up guns, heals, ammo
   use the same rule for drones
   maybe give some other bonus too?
 
-mod: + move speed and jump height
-  will leg animations look strange?
-    that's OK for a mod
-  this could just slow the mobs down instead?
-    how?
-
 rework junk bot
   it's behavior is too unpredictable
     range is unclear
     having the bullets last long after doing dmg isn't fun
   we want a fun gun that acts like a melee weapon
 
-mouse can get suck as clicked if the user clicks off the window
-  can lead to gun lock up until player pressed mouse again
-  should I really need to fix this?
-
-diegetic field meter
-  show as the player head filling with teal color
-
 atmosphere levels
   large rotating fan that the player has to move through
   give the user a rest, between combat
@@ -55,17 +49,10 @@ Boss levels
 
 add a key that player picks up and needs to set on the exit door to open it
 
-add modular difficulty settings
-  take reduced dmg
-  slower mob look / CD
-  more drops
-  fewer mobs
-    make a new var to scale number of mobs and stop using levels cleared var
-
 make power ups keep moving to player if the pickup field is turned off before they get picked up
   not sure how to do this without adding a constant check
 
-levels spawn by having the map aspects randomly fly into place
+animate new level spawn by having the map aspects randomly fly into place
 
 new map with repeating endlessness
   get ideas from Manifold Garden game
@@ -128,6 +115,37 @@ map:        0x000001   0x111111
 
 */
 
+//build build grid display
+let isShowingBuilds = false
+document.getElementById("build-button").addEventListener("click", () => {
+  const el = document.getElementById("build-grid")
+  if (isShowingBuilds) {
+    el.style.display = "none"
+    isShowingBuilds = false
+    document.body.style.overflow = "hidden"
+    document.getElementById("controls").style.display = 'inline'
+  } else {
+    let text = ""
+    for (let i = 0, len = mech.fieldUpgrades.length; i < len; i++) {
+      text += `<div class="build-grid-module "><div class="circle-grid field"></div> &nbsp; <strong style='font-size:1.3em;'>${mech.fieldUpgrades[i].name}</strong><br> ${mech.fieldUpgrades[i].description}</div>`
+    }
+    for (let i = 0, len = b.guns.length; i < len; i++) {
+      text += `<div class="build-grid-module "><div class="circle-grid gun"></div> &nbsp; <strong style='font-size:1.3em;'>${b.guns[i].name}</strong><br> ${b.guns[i].description}</div>`
+    }
+    for (let i = 0, len = b.mods.length; i < len; i++) {
+      text += `<div class="build-grid-module "><div class="circle-grid mod"></div> &nbsp; <strong style='font-size:1.3em;'>${b.mods[i].name}</strong><br> ${b.mods[i].description}</div>`
+    }
+    el.innerHTML = text
+    el.style.display = "grid"
+    isShowingBuilds = true
+    document.body.style.overflowY = "scroll";
+    document.body.style.overflowX = "hidden";
+    document.getElementById("controls").style.display = 'none'
+  }
+});
+
+
+
 //set up canvas
 var canvas = document.getElementById("canvas");
 //using "const" causes problems in safari when an ID shares the same name.
diff --git a/js/level.js b/js/level.js
index ca751f1..2bbd2fc 100644
--- a/js/level.js
+++ b/js/level.js
@@ -14,9 +14,10 @@ const level = {
   start() {
     if (level.levelsCleared === 0) {
       // game.difficulty = 6; //for testing to simulate possible mobs spawns
-      // b.giveGuns(14)
+      // level.startBuildRun(6)
+      // b.giveGuns(11)
       // mech.fieldUpgrades[2].effect();
-      // b.giveMod(15)
+      // b.giveMod(20)
       // spawn.pickList = ["ghoster", "ghoster"]
 
       this.intro(); //starting level
@@ -36,6 +37,77 @@ const level = {
     level.addToWorld(); //add bodies to game engine
     game.draw.setPaths();
   },
+  isBuildRun: false,
+  builds: [ // choose 5 total: guns, mods, and field
+    () => {
+      mech.fieldUpgrades[2].effect();
+      b.giveMod(6)
+      b.giveMod(8)
+      b.giveMod(9)
+      b.giveMod(15)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: melee</h2>", 300);
+    },
+    () => {
+      b.giveGuns(13)
+      mech.fieldUpgrades[5].effect();
+      b.giveMod(8)
+      b.giveMod(3)
+      b.giveMod(11)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: drones</h2>", 300);
+    },
+    () => {
+      b.giveGuns(8)
+      mech.fieldUpgrades[4].effect();
+      b.giveMod(4)
+      b.giveMod(5)
+      b.giveMod(16)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: flak</h2>", 300);
+    },
+    () => {
+      b.giveMod(6)
+      b.giveMod(7)
+      b.giveMod(12)
+      b.giveMod(13)
+      b.giveMod(14)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: block thrower</h2>", 300);
+    },
+    () => {
+      b.giveGuns(5)
+      mech.fieldUpgrades[6].effect();
+      b.giveMod(1)
+      b.giveMod(8)
+      b.giveMod(15)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: stealth shotgun</h2>", 300);
+    },
+    () => {
+      b.giveGuns(2)
+      mech.fieldUpgrades[1].effect();
+      b.giveMod(8)
+      b.giveMod(9)
+      b.giveMod(11)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: time out</h2>", 300);
+    },
+    () => {
+      b.giveGuns(0)
+      mech.fieldUpgrades[5].effect();
+      b.giveMod(7)
+      b.giveMod(5)
+      b.giveMod(18)
+      game.replaceTextLog = true;
+      game.makeTextLog("<h2>build: laser tag</h2>", 300);
+    },
+  ],
+  startBuildRun(build) {
+    level.builds[build]()
+    game.difficulty = 6;
+    level.isBuildRun = true
+  },
   difficultyIncrease(num = 1) {
     for (let i = 0; i < num; i++) {
       game.dmgScale += 0.2; //damage done by mobs increases each level
diff --git a/js/mobs.js b/js/mobs.js
index c2ad0dc..6cfb686 100644
--- a/js/mobs.js
+++ b/js/mobs.js
@@ -898,6 +898,8 @@ const mobs = {
         }
       },
       damage(dmg) {
+        if (b.isModLowHealthDmg) dmg *= (3 / (2 + mech.health)) //up to 50% dmg at zero player health
+        if (b.isModFarAwayDmg) dmg *= 1 + Math.sqrt(Math.max(1000, Math.min(3500, this.distanceToPlayer())) - 1000) * 0.01 //up to 50% dmg at max range of 3500
         this.health -= dmg / Math.sqrt(this.mass);
         //this.fill = this.color + this.health + ')';
         if (this.health < 0.1) this.death();
@@ -913,7 +915,7 @@ const mobs = {
       },
       onDeath() {
         // a placeholder for custom effects on mob death
-        //to use declare custom method in mob spawn
+        // to use declare custom method in mob spawn
       },
       leaveBody: true,
       dropPowerUp: true,
diff --git a/js/player.js b/js/player.js
index 7a83107..b1c061f 100644
--- a/js/player.js
+++ b/js/player.js
@@ -68,15 +68,6 @@ const mech = {
   FxNotHolding: 0.015,
   Fx: 0.015, //run Force on ground  //this is reset in b.setModDefaults()
   FxAir: 0.015, //run Force in Air
-  definePlayerMass(mass = mech.defaultMass) {
-    Matter.Body.setMass(player, mass);
-    //reduce air and ground move forces
-    this.Fx = 0.075 / mass * b.modSquirrelFx
-    this.FxAir = 0.375 / mass / mass
-    //make player stand a bit lower when holding heavy masses
-    this.yOffWhen.stand = Math.max(this.yOffWhen.crouch, Math.min(49, 49 - (mass - 5) * 6))
-    if (this.onGround && !this.crouch) this.yOffGoal = this.yOffWhen.stand;
-  },
   yOff: 70,
   yOffGoal: 70,
   onGround: false, //checks if on ground or in air
@@ -415,11 +406,6 @@ const mech = {
     }
   },
   health: 0,
-  // regen() {
-  //   if (this.health < 1 && mech.cycle % 15 === 0) {
-  //     this.addHealth(0.01);
-  //   }
-  // },
   drawHealth() {
     if (this.health < 1) {
       ctx.fillStyle = "rgba(100, 100, 100, 0.5)";
@@ -450,6 +436,12 @@ const mech = {
   },
   defaultFPSCycle: 0, //tracks when to return to normal fps
   damage(dmg) {
+    if (b.isModMonogamy && b.inventory[0] === b.activeGun) {
+      for (let i = 0, len = b.inventory.length; i < len; i++) {
+        dmg *= 0.93
+      }
+    }
+    console.log(dmg, "after")
     this.health -= dmg;
     if (this.health < 0) {
       this.health = 0;
@@ -639,7 +631,6 @@ const mech = {
   throwChargeRate: 0,
   throwChargeMax: 0,
   fieldFireCD: 0,
-  fieldDamage: 0,
   fieldShieldingScale: 0,
   grabRange: 0,
   fieldArc: 0,
@@ -656,7 +647,6 @@ const mech = {
     player.collisionFilter.mask = 0x010011 //0x010011 is normal
     this.holdingMassScale = 0.5;
     this.fieldFireCD = 15;
-    this.fieldDamage = 0; // a value of 1.0 kills a small mob in 2-3 hits on level 1
     this.fieldShieldingScale = 1; //scale energy loss after collision with mob
     this.grabRange = 175;
     this.fieldArc = 0.2; //run calculateFieldThreshold after setting fieldArc, used for powerUp grab and mobPush with lookingAt(mob)
@@ -701,6 +691,15 @@ const mech = {
       this.throwCharge = 0;
     }
   },
+  definePlayerMass(mass = mech.defaultMass) {
+    Matter.Body.setMass(player, mass);
+    //reduce air and ground move forces
+    this.Fx = 0.075 / mass * b.modSquirrelFx
+    this.FxAir = 0.375 / mass / mass
+    //make player stand a bit lower when holding heavy masses
+    this.yOffWhen.stand = Math.max(this.yOffWhen.crouch, Math.min(49, 49 - (mass - 5) * 6))
+    if (this.onGround && !this.crouch) this.yOffGoal = this.yOffWhen.stand;
+  },
   drawHold(target, stroke = true) {
     const eye = 15;
     const len = target.vertices.length - 1;
@@ -869,55 +868,70 @@ const mech = {
       }
     }
   },
-  pushMobs() { // push all mobs in range and in direction looking
+  pushMass(who) {
+    const fieldBlockCost = Math.max(0.02, who.mass * 0.012) //0.012
+    if (this.fieldMeter > fieldBlockCost) {
+      this.fieldMeter -= fieldBlockCost * this.fieldShieldingScale;
+      if (this.fieldMeter < 0) this.fieldMeter = 0;
+      this.drawHold(who);
+      //knock backs
+      const angle = Math.atan2(player.position.y - who.position.y, player.position.x - who.position.x);
+      const mass = Math.min(Math.sqrt(who.mass), 4);
+      Matter.Body.setVelocity(who, {
+        x: player.velocity.x - (15 * Math.cos(angle)) / mass,
+        y: player.velocity.y - (15 * Math.sin(angle)) / mass
+      });
+      Matter.Body.setVelocity(player, {
+        x: player.velocity.x + 5 * Math.cos(angle) * mass,
+        y: player.velocity.y + 5 * Math.sin(angle) * mass
+      });
+    }
+  },
+  pushMobsFacing() { // find mobs in range and in direction looking
     for (let i = 0, len = mob.length; i < len; ++i) {
-      if (this.lookingAt(mob[i]) && Matter.Vector.magnitude(Matter.Vector.sub(mob[i].position, this.pos)) < this.grabRange && Matter.Query.ray(map, mob[i].position, this.pos).length === 0) {
-        const fieldBlockCost = Math.max(0.02, mob[i].mass * 0.012) //0.012
-        if (this.fieldMeter > fieldBlockCost) {
-          this.fieldMeter -= fieldBlockCost * this.fieldShieldingScale;
-          if (this.fieldMeter < 0) this.fieldMeter = 0;
-          if (this.fieldDamage) mob[i].damage(b.dmgScale * this.fieldDamage);
-          mob[i].locatePlayer();
-          this.drawHold(mob[i]);
-          //mob and player knock back
-          const angle = Math.atan2(player.position.y - mob[i].position.y, player.position.x - mob[i].position.x);
-          const mass = Math.min(Math.sqrt(mob[i].mass), 4);
-          Matter.Body.setVelocity(mob[i], {
-            x: player.velocity.x - (15 * Math.cos(angle)) / mass,
-            y: player.velocity.y - (15 * Math.sin(angle)) / mass
-          });
-          Matter.Body.setVelocity(player, {
-            x: player.velocity.x + 5 * Math.cos(angle) * mass,
-            y: player.velocity.y + 5 * Math.sin(angle) * mass
-          });
-        }
+      if (
+        Matter.Vector.magnitude(Matter.Vector.sub(mob[i].position, this.pos)) < this.grabRange &&
+        this.lookingAt(mob[i]) &&
+        Matter.Query.ray(map, mob[i].position, this.pos).length === 0
+      ) {
+        mob[i].locatePlayer();
+        mech.pushMass(mob[i]);
       }
     }
   },
-  pushMobs360(range = this.grabRange * 0.75) { // push all mobs in range in any direction
+  pushMobs360(range = this.grabRange * 0.75) { // find mobs in range in any direction
     for (let i = 0, len = mob.length; i < len; ++i) {
-      if (Matter.Vector.magnitude(Matter.Vector.sub(mob[i].position, this.pos)) < range && Matter.Query.ray(map, mob[i].position, this.pos).length === 0) {
-        const fieldBlockCost = Math.max(0.02, mob[i].mass * 0.012)
-        if (this.fieldMeter > fieldBlockCost) {
-          this.fieldMeter -= fieldBlockCost * this.fieldShieldingScale;
-          if (this.fieldMeter < 0) this.fieldMeter = 0
-
-          if (this.fieldDamage) mob[i].damage(b.dmgScale * this.fieldDamage);
-          mob[i].locatePlayer();
-          this.drawHold(mob[i]);
-          //mob and player knock back
-          const angle = Math.atan2(player.position.y - mob[i].position.y, player.position.x - mob[i].position.x);
-          const mass = Math.min(Math.sqrt(mob[i].mass), 4);
-          // console.log(mob[i].mass, Math.sqrt(mob[i].mass), mass)
-          Matter.Body.setVelocity(mob[i], {
-            x: player.velocity.x - (15 * Math.cos(angle)) / mass,
-            y: player.velocity.y - (15 * Math.sin(angle)) / mass
-          });
-          Matter.Body.setVelocity(player, {
-            x: player.velocity.x + 5 * Math.cos(angle) * mass,
-            y: player.velocity.y + 5 * Math.sin(angle) * mass
-          });
-        }
+      if (
+        Matter.Vector.magnitude(Matter.Vector.sub(mob[i].position, this.pos)) < range &&
+        Matter.Query.ray(map, mob[i].position, this.pos).length === 0
+      ) {
+        mob[i].locatePlayer();
+        mech.pushMass(mob[i]);
+      }
+    }
+  },
+  pushBodyFacing() { // push all body in range and in direction looking
+    for (let i = 0, len = body.length; i < len; ++i) {
+      if (
+        body[i].speed > 12 && body[i].mass > 2 &&
+        Matter.Vector.magnitude(Matter.Vector.sub(body[i].position, this.pos)) < this.grabRange &&
+        this.lookingAt(body[i]) &&
+        Matter.Query.ray(map, body[i].position, this.pos).length === 0
+      ) {
+        mech.pushMass(body[i]);
+      }
+    }
+  },
+  pushBody360(range = this.grabRange * 0.75) { // push all body in range and in direction looking
+    for (let i = 0, len = body.length; i < len; ++i) {
+      if (
+        body[i].speed > 12 && body[i].mass > 2 &&
+        Matter.Vector.magnitude(Matter.Vector.sub(body[i].position, this.pos)) < range &&
+        this.lookingAt(body[i]) &&
+        Matter.Query.ray(map, body[i].position, this.pos).length === 0 &&
+        body[i].collisionFilter.category === 0x010000
+      ) {
+        mech.pushMass(body[i]);
       }
     }
   },
@@ -1017,12 +1031,12 @@ const mech = {
   },
   fieldUpgrades: [{
       name: "field emitter",
-      description: "<strong class='color-f'>shields</strong> you from <span class='color-d'>damage</span><br>lets you <strong>pick up</strong> and throw objects",
+      description: "use <strong class='color-f'>energy</strong> to <strong>shield</strong> yourself from <strong class='color-d'>damage</strong><br>lets you <strong>pick up</strong> and <strong>throw</strong> objects",
       effect: () => {
         mech.fieldMode = 0;
         mech.fieldText();
         game.replaceTextLog = true; //allow text over write
-        // game.makeTextLog("<strong style='font-size:30px;'></strong><br> <span class='faded'>(right click or space bar)</span><p></p>", 1200);
+        // game.makeTextLog("<strong style='font-size:30px;'></strong><br> <strong class='faded'>(right click or space bar)</strong><p></p>", 1200);
         mech.setHoldDefaults();
         mech.hold = function () {
           if (mech.isHolding) {
@@ -1032,7 +1046,8 @@ const mech = {
           } else if ((keys[32] || game.mouseDownRight && mech.fieldMeter > 0.1)) { //not hold but field button is pressed
             mech.drawField();
             mech.grabPowerUp();
-            mech.pushMobs();
+            mech.pushMobsFacing();
+            mech.pushBodyFacing();
             mech.lookForPickUp();
           } else if (mech.holdingTarget && mech.fireCDcycle < mech.cycle && mech.fieldMeter > 0.05) { //holding, but field button is released
             mech.pickUp();
@@ -1045,7 +1060,7 @@ const mech = {
     },
     {
       name: "time dilation field",
-      description: "<strong style='letter-spacing: 3px;'>stop time</strong> while field is active<br> <em>can fire while field is active</em>",
+      description: "use <strong class='color-f'>energy</strong> to <strong style='letter-spacing: 1px;'>stop time</strong><br><em>can fire bullets while field is active</em>",
       effect: () => {
         mech.fieldMode = 1;
         mech.fieldText();
@@ -1119,14 +1134,14 @@ const mech = {
     },
     {
       name: "plasma torch",
-      description: "field emits a beam of destructive <strong style='color:#d0d;'>ionized gas</strong><br><span style='color:#a00;'>decreased</span> <strong class='color-f'>shield</strong> range and efficiency",
+      description: "use <strong class='color-f'>energy</strong> to emit <strong class='color-d'>damaging</strong> beam<br><strong>decreased</strong> <strong>shield</strong> range and efficiency",
       effect: () => {
         mech.fieldMode = 2;
         mech.fieldText();
         mech.setHoldDefaults();
         // mech.fieldShieldingScale = 2;
         // mech.grabRange = 125;
-        mech.fieldArc = 0.05 //run calculateFieldThreshold after setting fieldArc, used for powerUp grab and mobPush with lookingAt(mob)
+        mech.fieldArc = 0.1 //run calculateFieldThreshold after setting fieldArc, used for powerUp grab and mobPush with lookingAt(mob)
         mech.calculateFieldThreshold(); //run after setting fieldArc, used for powerUp grab and mobPush with lookingAt(mob)
         mech.hold = function () {
           if (mech.isHolding) {
@@ -1269,7 +1284,8 @@ const mech = {
               ctx.lineWidth = 2 * Math.random();
               ctx.stroke();
 
-              mech.pushMobs360(100);
+              mech.pushMobs360(110);
+              // mech.pushBody360(100); //disabled because doesn't work at short range
               mech.grabPowerUp();
               mech.lookForPickUp();
             } else {
@@ -1286,7 +1302,7 @@ const mech = {
     },
     {
       name: "negative mass field",
-      description: "field nullifies &nbsp;<strong style='letter-spacing: 15px;'>gravity</strong><br><em>can fire while field is active</em>",
+      description: "use <strong class='color-f'>energy</strong> to nullify &nbsp; <strong style='letter-spacing: 10px;'>gravity</strong><br><em>can fire bullets while active</em>",
       effect: () => {
         mech.fieldMode = 3;
         mech.fieldText();
@@ -1302,6 +1318,7 @@ const mech = {
             const DRAIN = 0.0004
             if (mech.fieldMeter > DRAIN) {
               mech.pushMobs360(170);
+              mech.pushBody360(180);
               mech.grabPowerUp();
               mech.lookForPickUp(170);
               //look for nearby objects to make zero-g
@@ -1373,7 +1390,7 @@ const mech = {
     },
     {
       name: "standing wave harmonics",
-      description: "you are surrounded by oscillating <strong class='color-f'>shields</strong><br> <span style='color:#a00;'>decreased</span> field regeneration",
+      description: "oscillating <strong>shields</strong> surround you <strong>constantly</strong><br> <strong>decreased</strong> <strong class='color-f'>energy</strong> regeneration",
       effect: () => {
         mech.fieldMode = 4;
         mech.fieldText();
@@ -1409,6 +1426,7 @@ const mech = {
             ctx.arc(mech.pos.x, mech.pos.y, grabRange3, 0, 2 * Math.PI);
             ctx.fill();
             mech.pushMobs360(netGrabRange);
+            mech.pushBody360(netGrabRange);
           }
           mech.drawFieldMeter()
         }
@@ -1416,16 +1434,16 @@ const mech = {
     },
     {
       name: "nano-scale manufacturing",
-      description: "excess field <span class='color-f'>energy</span> used to build <strong class='color-b'>drones</strong><br> increased <span class='color-f'>energy</span> regeneration",
+      description: "excess <strong class='color-f'>energy</strong> used to build <strong>drones</strong><br><strong>3x</strong> <strong class='color-f'>energy</strong> regeneration",
       effect: () => {
         let gunIndex = 13 //Math.random() < 0.5 ? 13 : 14
         mech.fieldMode = 5;
         mech.fieldText();
         mech.setHoldDefaults();
-        mech.fieldRegen *= 3.5;
+        mech.fieldRegen *= 3;
         mech.hold = function () {
           if (mech.fieldMeter === 1) {
-            mech.fieldMeter -= 0.5;
+            mech.fieldMeter -= 0.43;
             b.guns[gunIndex].fire() //spawn drone
           }
           if (mech.isHolding) {
@@ -1433,7 +1451,8 @@ const mech = {
             mech.holding();
             mech.throw();
           } else if ((keys[32] || game.mouseDownRight && mech.fieldMeter > 0.1)) { //not hold but field button is pressed
-            mech.pushMobs();
+            mech.pushMobsFacing();
+            mech.pushBodyFacing();
             mech.drawField();
             mech.grabPowerUp();
             mech.lookForPickUp();
@@ -1448,7 +1467,7 @@ const mech = {
     },
     {
       name: "phase decoherence field",
-      description: "<strong>intangible</strong> while field is active<br><em style='opacity: 0.6;'>can't see or be seen outside field</em>",
+      description: "use <strong class='color-f'>energy</strong> to to become <strong>intangible</strong><br><em style='opacity: 0.6;'>can't see or be seen outside field</em>",
       effect: () => {
         mech.fieldMode = 6;
         mech.fieldText();
@@ -1493,142 +1512,5 @@ const mech = {
         }
       }
     },
-
-    // {
-    //   name: "electrostatic field",
-    //   description: "field does <strong class='color-d'>damage</strong> on contact<br> increased <span class='color-f'>field</span> regeneration",
-    //   effect: () => {
-    //     mech.fieldMode = 2;
-    //     mech.fieldText();
-    //     mech.setHoldDefaults();
-    //     mech.grabRange = 225;
-    //     mech.fieldShieldingScale = 2.5;
-    //     mech.fieldRegen *= 2;
-    //     mech.fieldDamage = 4; //passive field does extra damage
-    //     // mech.fieldArc = 0.11
-    //     // mech.calculateFieldThreshold(); //run after setting fieldArc, used for powerUp grab and mobPush with lookingAt(mob)
-    //     mech.hold = function () {
-    //       if (mech.isHolding) {
-    //         mech.drawHold(mech.holdingTarget);
-    //         mech.holding();
-    //         mech.throw();
-    //       } else if ((keys[32] || game.mouseDownRight) && mech.fieldMeter > 0.15) { //not hold but field button is pressed
-    //         //draw electricity
-    //         const Dx = Math.cos(mech.angle);
-    //         const Dy = Math.sin(mech.angle);
-    //         let x = mech.pos.x + 20 * Dx;
-    //         let y = mech.pos.y + 20 * Dy;
-    //         ctx.beginPath();
-    //         ctx.moveTo(x, y);
-    //         for (let i = 0; i < 8; i++) {
-    //           x += 18 * (Dx + 2 * (Math.random() - 0.5))
-    //           y += 18 * (Dy + 2 * (Math.random() - 0.5))
-    //           ctx.lineTo(x, y);
-    //         }
-    //         ctx.lineWidth = 1 //0.5 + 2 * Math.random();
-    //         ctx.strokeStyle = `rgba(100,20,50,${0.5+0.5*Math.random()})`;
-    //         ctx.stroke();
-
-    //         //draw field
-    //         const range = 170;
-    //         const arc = Math.PI * 0.11
-    //         ctx.beginPath();
-    //         ctx.arc(mech.pos.x, mech.pos.y, range, mech.angle - arc, mech.angle + arc, false);
-    //         ctx.lineTo(mech.pos.x + 13 * Math.cos(mech.angle), mech.pos.y + 13 * Math.sin(mech.angle));
-    //         if (mech.holdingTarget) {
-    //           ctx.fillStyle = "rgba(255,50,150," + (0.01 + mech.fieldMeter * (0.1 + 0.1 * Math.random())) + ")";
-    //         } else {
-    //           ctx.fillStyle = "rgba(255,50,150," + (0.02 + mech.fieldMeter * (0.18 + 0.18 * Math.random())) + ")";
-    //         }
-    //         // ctx.fillStyle = "rgba(110,170,200," + (0.02 + mech.fieldMeter * (0.08 + 0.1 * Math.random())) + ")";
-    //         // ctx.fillStyle = "rgba(110,170,200," + (0.06 + mech.fieldMeter * (0.1 + 0.18 * Math.random())) + ")";
-    //         ctx.fill();
-
-    //         //draw random lines in field for cool effect
-    //         // eye = 15;
-    //         // ctx.beginPath();
-    //         // ctx.moveTo(mech.pos.x + eye * Math.cos(mech.angle), mech.pos.y + eye * Math.sin(mech.angle));
-    //         // const offAngle = mech.angle + 2 * Math.PI * mech.fieldArc * (Math.random() - 0.5);
-    //         // ctx.lineTo(mech.pos.x + range * Math.cos(offAngle), mech.pos.y + range * Math.sin(offAngle));
-    //         // ctx.strokeStyle = "rgba(100,20,50,0.2)";
-    //         // ctx.stroke();
-
-    //         mech.grabPowerUp();
-    //         mech.pushMobs();
-    //         mech.lookForPickUp();
-    //       } else if (mech.holdingTarget && mech.fireCDcycle < mech.cycle && mech.fieldMeter > 0.05) { //holding, but field button is released
-    //         mech.pickUp();
-    //       } else {
-    //         mech.holdingTarget = null; //clears holding target (this is so you only pick up right after the field button is released and a hold target exists)
-    //       }
-    //       mech.drawFieldMeter()
-    //     }
-    //   }
-    // },
-
-    // () => {
-    //   mech.fieldMode = 7;
-    //   game.makeTextLog("<strong style='font-size:30px;'>Thermal Radiation Field</strong><br> <span class='faded'>(right click or space bar)</span> <p>field grows while active<br>damages all targets within range, <span style='color:#a00;'>including player</span><br> <span style='color:#a00;'>decreased</span> field shielding efficiency</p>", 1200);
-    //   mech.setHoldDefaults();
-    //   mech.fieldShieldingScale = 10;
-    //   mech.rangeSmoothing = 0
-    //   mech.hold = function () {
-    //     if (mech.isHolding) {
-    //       mech.drawHold(mech.holdingTarget);
-    //       mech.holding();
-    //       mech.throw();
-    //     } else if ((keys[32] || game.mouseDownRight && mech.fieldCDcycle < mech.cycle)) { //not hold but field button is pressed
-    //       mech.grabPowerUp();
-    //       mech.lookForPickUp(Math.max(180, mech.grabRange));
-    //       mech.pushMobs360(140);
-
-    //       if (mech.health > 0.1) {
-    //         const DRAIN = 0.0008 
-    //         if (mech.fieldMeter > DRAIN) {
-    //           mech.fieldMeter -= DRAIN;
-    //           mech.damage(0.00005 + 0.00000012 * mech.grabRange)
-    //           //draw damage field
-    //           mech.grabRange = mech.grabRange * 0.997 + (1350 + 150 * Math.cos(mech.cycle / 30)) * 0.003
-    //           let gradient = ctx.createRadialGradient(this.pos.x, this.pos.y, 0, this.pos.x, this.pos.y, mech.grabRange);
-    //           gradient.addColorStop(0, 'rgba(255,255,255,0.7)');
-    //           gradient.addColorStop(1, 'rgba(255,0,50,' + (0.6 + 0.2 * Math.random()) + ')');
-
-    //           const angleOff = 2 * Math.PI * Math.random()
-    //           ctx.beginPath();
-    //           ctx.arc(this.pos.x, this.pos.y, mech.grabRange + Math.sqrt(mech.grabRange) * 0.7 * (Math.random() - 0.5), angleOff, 1.8 * Math.PI + angleOff);
-    //           ctx.fillStyle = gradient //rgba(255,0,0,0.2)
-    //           ctx.fill();
-
-    //           //damage and push away mobs in range
-    //           for (let i = 0, len = mob.length; i < len; ++i) {
-    //             if (mob[i].alive) {
-    //               sub = Matter.Vector.sub(this.pos, mob[i].position);
-    //               dist = Matter.Vector.magnitude(sub);
-    //               if (dist < mech.grabRange) {
-    //                 mob[i].damage(0.01);
-    //                 mob[i].locatePlayer();
-    //                 mob[i].force = Matter.Vector.mult(Matter.Vector.normalise(sub), -0.0001 * mob[i].mass) //gently push mobs back
-    //               }
-    //             }
-    //           }
-    //         } else {
-    //           mech.fieldCDcycle = mech.cycle + 120;
-    //         }
-    //       } else {
-    //         mech.grabRange = 180;
-    //         mech.drawField();
-    //         mech.grabPowerUp();
-    //         mech.lookForPickUp();
-    //       }
-    //     } else if (mech.holdingTarget && mech.fireCDcycle < mech.cycle && mech.fieldMeter > 0.05) { //holding, but field button is released
-    //       mech.grabRange = 0
-    //       mech.pickUp();
-    //     } else {
-    //       mech.grabRange = 0
-    //       mech.holdingTarget = null; //clears holding target (this is so you only pick up right after the field button is released and a hold target exists)
-    //     }
-    //     mech.drawFieldMeter()
-    //   }
-    // },
   ],
 };
\ No newline at end of file
diff --git a/js/powerups.js b/js/powerups.js
index d2a1af6..7f18594 100644
--- a/js/powerups.js
+++ b/js/powerups.js
@@ -45,7 +45,8 @@ const powerUps = {
         if (!game.lastLogTime) game.makeTextLog("<span style='font-size:115%;'><span class='color-f'>+energy</span></span>", 300);
       } else {
         //ammo given scales as mobs take more hits to kill
-        const ammo = Math.ceil((target.ammoPack * (0.45 + 0.08 * Math.random())) / b.dmgScale);
+        let ammo = Math.ceil((target.ammoPack * (0.4 + 0.05 * Math.random())) / b.dmgScale);
+        if (level.isBuildRun) ammo *= 2
         target.ammo += ammo;
         game.updateGunHUD();
         game.makeTextLog("<div class='circle gun'></div> &nbsp; <span style='font-size:110%;'>+" + ammo + " ammo for " + target.name + "</span>", 300);
@@ -143,38 +144,49 @@ const powerUps = {
   spawnRandomPowerUp(x, y) { //mostly used after mob dies 
     if (Math.random() * Math.random() - 0.25 > Math.sqrt(mech.health) || Math.random() < 0.04) { //spawn heal chance is higher at low health
       powerUps.spawn(x, y, "heal");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "heal");
       return;
     }
-    if (Math.random() < 0.2) {
-      if (b.inventory.length > 0) powerUps.spawn(x, y, "ammo");
+    if (Math.random() < 0.2 && b.inventory.length > 0) {
+      powerUps.spawn(x, y, "ammo");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "ammo");
       return;
     }
     if (Math.random() < 0.004 * (5 - b.inventory.length)) { //a new gun has a low chance for each not acquired gun to drop
       powerUps.spawn(x, y, "gun");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "gun");
       return;
     }
     if (Math.random() < 0.004 * (8 - b.modCount)) {
       powerUps.spawn(x, y, "mod");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "mod");
       return;
     }
     if (Math.random() < 0.005) {
       powerUps.spawn(x, y, "field");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "field");
       return;
     }
   },
   spawnBossPowerUp(x, y) { //boss spawns field and gun mod upgrades
     if (mech.fieldMode === 0) {
       powerUps.spawn(x, y, "field")
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "field")
     } else if (Math.random() < 0.042 * (b.mods.length - b.modCount)) {
       powerUps.spawn(x, y, "mod")
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "mod")
     } else if (Math.random() < 0.3) {
       powerUps.spawn(x, y, "field");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "field");
     } else if (Math.random() < 0.05 * (7 - b.inventory.length)) { //a new gun has a low chance for each not acquired gun to drop
       powerUps.spawn(x, y, "gun")
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "gun")
     } else if (mech.health < 0.6) {
       powerUps.spawn(x, y, "heal");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "heal");
     } else {
       powerUps.spawn(x, y, "ammo");
+      if (Math.random() < b.modMoreDrops) powerUps.spawn(x, y, "ammo");
     }
   },
   chooseRandomPowerUp(x, y) { //100% chance to drop a random power up    //used in spawn.debris
@@ -195,31 +207,33 @@ const powerUps = {
     }
   },
   spawn(x, y, target, moving = true, mode = null) {
-    let i = powerUp.length;
-    target = powerUps[target];
-    size = target.size();
-    powerUp[i] = Matter.Bodies.polygon(x, y, 0, size, {
-      density: 0.001,
-      frictionAir: 0.01,
-      restitution: 0.8,
-      inertia: Infinity, //prevents rotation
-      collisionFilter: {
-        group: 0,
-        category: 0x100000,
-        mask: 0x100001
-      },
-      color: target.color,
-      effect: target.effect,
-      mode: mode,
-      name: target.name,
-      size: size
-    });
-    if (moving) {
-      Matter.Body.setVelocity(powerUp[i], {
-        x: (Math.random() - 0.5) * 15,
-        y: Math.random() * -9 - 3
+    if (!level.isBuildRun || target === "heal" || target === "ammo") {
+      let i = powerUp.length;
+      target = powerUps[target];
+      size = target.size();
+      powerUp[i] = Matter.Bodies.polygon(x, y, 0, size, {
+        density: 0.001,
+        frictionAir: 0.01,
+        restitution: 0.8,
+        inertia: Infinity, //prevents rotation
+        collisionFilter: {
+          group: 0,
+          category: 0x100000,
+          mask: 0x100001
+        },
+        color: target.color,
+        effect: target.effect,
+        mode: mode,
+        name: target.name,
+        size: size
       });
+      if (moving) {
+        Matter.Body.setVelocity(powerUp[i], {
+          x: (Math.random() - 0.5) * 15,
+          y: Math.random() * -9 - 3
+        });
+      }
+      World.add(engine.world, powerUp[i]); //add to world
     }
-    World.add(engine.world, powerUp[i]); //add to world
   },
 };
\ No newline at end of file
diff --git a/style.css b/style.css
index de8caaf..13582b8 100644
--- a/style.css
+++ b/style.css
@@ -1,7 +1,7 @@
 body {
   font-family: "Helvetica", "Arial", sans-serif;
   margin: 0;
-  overflow: hidden;
+  /* overflow: hidden; */
   background-color: #fff;
   user-select: none;
   /*cursor: crosshair;*/
@@ -35,10 +35,78 @@ table {
   /* background-color: #ddd; */
 }
 
+th {
+  text-align: left;
+}
+
 summary {
   font-size: 1.2em;
 }
 
+#build-button {
+  position: absolute;
+  bottom: 0px;
+  right: 1px;
+  z-index: 12;
+  font-size: 1.3em;
+}
+
+#build-grid {
+  padding: 10px;
+  margin: 0px;
+  border: 0px;
+  /* border-radius: 8px; */
+  background-color: #b6bfca;
+
+  display: none;
+  /* display: grid; */
+  grid-template-columns: repeat(auto-fit, minmax(292px, 1fr));
+  grid-auto-rows: minmax(auto, auto);
+  grid-gap: 15px;
+
+  position: relative;
+  bottom: 0px;
+  /* left: 0px; */
+  z-index: 12;
+  font-size: 1.3em;
+}
+
+.build-grid-module {
+  /* box-shadow: 0px 1px 4px #234; */
+  padding: 7px;
+  /* margin: 4px; */
+  line-height: 150%;
+  border-radius: 6px;
+  background: #eee;
+  font-size: 0.65em;
+  /* display: flex; */
+}
+
+.build-grid-module:hover {
+  background-color: #fff;
+}
+
+.gun-module {
+  background: #d5dde5;
+}
+
+.field-module {
+  background: #bde;
+}
+
+.mod-module {
+  background: #fdf;
+}
+
+
+/* #build {
+  position: absolute;
+  bottom: 0px;
+  right: 1px;
+  z-index: 12;
+  font-size: 1.3em;
+} */
+
 #controls {
   position: absolute;
   bottom: 0px;
@@ -49,14 +117,6 @@ summary {
   /* border-radius: 5px; */
 }
 
-#settings {
-  position: absolute;
-  bottom: 0px;
-  right: 1px;
-  z-index: 12;
-  font-size: 1.3em;
-}
-
 #details-div {
   padding: 10px;
   border-radius: 8px;
@@ -214,36 +274,28 @@ em {
 
 .color-f {
   color: #0cf;
-}
-
-.color-b {
-  color: #024;
+  letter-spacing: 1px;
 }
 
 .color-d {
-  color: #f05;
-}
-
-.color-l {
-  color: #f0f;
+  color: #f03;
+  letter-spacing: 1px;
 }
 
 .color-h {
-  color: #0d9;
+  color: #0c8;
+  letter-spacing: 1px;
 }
 
 .color-e {
-  color: #a10;
-}
-
-.color-m {
-  color: #536;
+  color: #e50;
+  letter-spacing: 1px;
 }
 
 .color-s {
   color: #066;
   font-weight: 900;
-  letter-spacing: 2px;
+  letter-spacing: 1px;
 }
 
 .faded {
@@ -256,6 +308,15 @@ em {
   height: 20px;
   border-radius: 50%;
   display: inline-block;
+  margin-bottom: -2px;
+}
+
+.circle-grid {
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  display: inline-block;
+  margin-bottom: -4px;
 }
 
 .field {
@@ -268,12 +329,10 @@ em {
 
 .gun {
   background: #149;
-  margin-bottom: -2px;
 }
 
 .heal {
   background: #0d9;
-  margin-bottom: -2px;
 }
 
 .box {

FIRE	FIRE	left mouse
FIELD	FIELD	right mouse / spacebar
MOVE	MOVE	WASD / arrows
GUNS	GUNS	Q / E / mouse wheel
ZOOM	ZOOM	+ / -
PAUSE	PAUSE	P