diff --git a/js/bullets.js b/js/bullets.js
index 678f3e3..ef47558 100644
--- a/js/bullets.js
+++ b/js/bullets.js
@@ -42,65 +42,26 @@ const b = {
   modLaserFieldDrain: null,
   isModNoAmmo: null,
   isModAmmoFromHealth: null,
-  mobDieAtHealth: null,
+  modMobDieAtHealth: null,
   isModEnergyRecovery: null,
   isModHealthRecovery: null,
-  setModDefaults() {
-    b.modCount = 0;
-    b.modFireRate = 1;
-    b.modExplosionRadius = 1;
-    b.isModImmuneExplosion = false;
-    b.modBulletSize = 1;
-    b.isModDroneOnDamage = false;
-    b.modEnergySiphon = 0;
-    b.modHealthDrain = 0;
-    b.modNoAmmo = 0;
-    b.isModBulletsLastLonger = 1;
-    b.isModDroneCollide = true;
-    b.isModFastSpores = false
-    b.isModImmortal = false;
-    b.modSpores = 0;
-    b.modAcidDmg = 0;
-    b.isModAcidDmg = false;
-    game.playerDmgColor = "rgba(0,0,0,0.7)"
-    b.isModAnnihilation = false;
-    b.modRecursiveHealing = 1;
-    b.modSquirrelFx = 1;
-    b.isModCrit = false;
-    b.isModBayesian = 0;
-    b.isModFourOptions = false;
-    b.isModLowHealthDmg = false;
-    b.isModFarAwayDmg = false;
-    b.isModEntanglement = false;
-    b.isModMassEnergy = false;
-    b.modLaserBotCount = 0;
-    b.modNailBotCount = 0;
-    b.modBlockDmg = 0;
-    b.isModPiezo = false;
-    b.isModStomp = false;
-    b.modCollisionImmuneCycles = 30;
-    b.modSuperBallNumber = 4;
-    b.modLaserReflections = 2;
-    b.modLaserDamage = 0.05;
-    b.modLaserFieldDrain = 0.002;
-    b.isModNoAmmo = false;
-    b.isModAmmoFromHealth = 0;
-    b.mobDieAtHealth = 0.05;
-    b.isModEnergyRecovery = false;
-    b.isModHealthRecovery = false;
-    mech.fieldRange = 175;
-    mech.Fx = 0.016; //if this changes update the values in  definePlayerMass
-    mech.jumpForce = 0.42; //was 0.38 at 0.0019 gravity
-    mech.maxHealth = 1;
-    mech.fieldEnergyMax = 1;
-    for (i = 0, len = b.guns.length; i < len; i++) { //find which gun is flak
-      if (b.guns[i].name === "flak") b.guns[i].ammoPack = b.guns[i].defaultAmmoPack;
-    }
-    for (let i = 0; i < b.mods.length; i++) {
+  isModEnergyLoss: null,
+  removeAllMods() {
+    for (let i = 0, len = b.mods.length; i < len; i++) {
+      b.mods[i].remove();
       b.mods[i].count = 0
     }
+    b.modCount = 0;
+
   },
-  modOnHealthChange() {
+  setModDefaults() {
+    for (let i = 0, len = b.mods.length; i < len; i++) {
+      if (b.mods[i].count) b.mods[i].remove();
+      b.mods[i].count = 0
+    }
+    b.modCount = 0;
+  },
+  modOnHealthChange() { //used with acid mod
     if (b.isModAcidDmg && mech.health > 0.8) {
       game.playerDmgColor = "rgba(0,80,80,0.9)"
       b.modAcidDmg = 0.9
@@ -119,6 +80,9 @@ const b = {
       },
       effect() {
         b.modBulletSize += 0.13
+      },
+      remove() {
+        b.modBulletSize = 1;
       }
     },
     {
@@ -127,11 +91,16 @@ const b = {
       maxCount: 1,
       count: 0,
       allowed() {
-        return mech.health > 0.8
+        return mech.health > 0.8 || level.isBuildRun
       },
       effect() {
         b.isModAcidDmg = true;
         b.modOnHealthChange();
+      },
+      remove() {
+        b.modAcidDmg = 0;
+        b.isModAcidDmg = false;
+        game.playerDmgColor = "rgba(0,0,0,0.7)"
       }
     },
     {
@@ -144,6 +113,9 @@ const b = {
       },
       effect() {
         b.isModCrit = true;
+      },
+      remove() {
+        b.isModCrit = false;
       }
     },
     {
@@ -156,6 +128,9 @@ const b = {
       },
       effect() {
         b.isModFarAwayDmg = true; //used in mob.damage()
+      },
+      remove() {
+        b.isModFarAwayDmg = false;
       }
     },
     {
@@ -168,6 +143,9 @@ const b = {
       },
       effect() {
         b.isModLowHealthDmg = true; //used in mob.damage()
+      },
+      remove() {
+        b.isModLowHealthDmg = false;
       }
     },
     {
@@ -180,11 +158,14 @@ const b = {
       },
       effect: () => {
         b.modExplosionRadius += 0.2;
+      },
+      remove() {
+        b.modExplosionRadius = 1;
       }
     },
     {
       name: "electric reactive armour",
-      description: "<strong class='color-e'>explosions</strong> do you no <strong>harm</strong>, but drain <strong class='color-f'>energy</strong>",
+      description: "<strong class='color-e'>explosions</strong> do no <strong>harm</strong><br> <strong class='color-e'>explosions</strong> drain <strong class='color-f'>energy</strong>",
       maxCount: 1,
       count: 0,
       allowed() {
@@ -192,6 +173,10 @@ const b = {
       },
       effect: () => {
         b.isModImmuneExplosion = true;
+      },
+      remove() {
+        b.isModImmuneExplosion = false;
+
       }
     },
     {
@@ -204,6 +189,9 @@ const b = {
       },
       effect() {
         b.modFireRate *= 0.86
+      },
+      remove() {
+        b.modFireRate = 1;
       }
     },
     {
@@ -216,6 +204,9 @@ const b = {
       },
       effect() {
         b.modNoAmmo = 1
+      },
+      remove() {
+        b.modNoAmmo = 0;
       }
     },
     {
@@ -228,6 +219,9 @@ const b = {
       },
       effect() {
         b.isModBulletsLastLonger += 0.33
+      },
+      remove() {
+        b.isModBulletsLastLonger = 1;
       }
     },
     {
@@ -239,7 +233,10 @@ const b = {
         return true
       },
       effect: () => {
-        b.mobDieAtHealth = 0.15
+        b.modMobDieAtHealth = 0.15
+      },
+      remove() {
+        b.modMobDieAtHealth = 0.05;
       }
     },
     {
@@ -255,6 +252,9 @@ const b = {
         for (let i = 0; i < 10; i++) {
           b.spore(player)
         }
+      },
+      remove() {
+        b.modSpores = 0;
       }
     },
     {
@@ -268,6 +268,9 @@ const b = {
       effect() {
         b.modLaserBotCount++;
         b.laserBot();
+      },
+      remove() {
+        b.modLaserBotCount = 0;
       }
     },
     {
@@ -281,6 +284,9 @@ const b = {
       effect() {
         b.modNailBotCount++;
         b.nailBot();
+      },
+      remove() {
+        b.modNailBotCount = 0;
       }
     },
     {
@@ -296,6 +302,9 @@ const b = {
         for (let i = 0; i < 4; i++) {
           b.drone() //spawn drone
         }
+      },
+      remove() {
+        b.isModDroneOnDamage = false;
       }
     },
     {
@@ -308,6 +317,9 @@ const b = {
       },
       effect() {
         b.modBlockDmg += 0.7 //if you change this value also update the for loop in the electricity graphics in mech.pushMass
+      },
+      remove() {
+        b.modBlockDmg = 0;
       }
     },
     {
@@ -319,7 +331,10 @@ const b = {
         return mech.fieldUpgrades[mech.fieldMode].name !== "time dilation field" && mech.fieldUpgrades[mech.fieldMode].name !== "phase decoherence field"
       },
       effect() {
-        mech.fieldRange = 175 * 1.4 //175 is default
+        mech.fieldRange = 175 * 1.4
+      },
+      remove() {
+        mech.fieldRange = 175;
       }
     },
     {
@@ -332,10 +347,13 @@ const b = {
       },
       effect() {
         b.isModEntanglement = true
+      },
+      remove() {
+        b.isModEntanglement = false;
       }
     },
     {
-      name: "waste energy recycling",
+      name: "waste energy recovery",
       description: "regen <strong>7%</strong> of max <strong class='color-f'>energy</strong> every second<br>active for <strong>5 seconds</strong> after a mob <strong>dies</strong>",
       maxCount: 1,
       count: 0,
@@ -344,10 +362,13 @@ const b = {
       },
       effect() {
         b.isModEnergyRecovery = true;
+      },
+      remove() {
+        b.isModEnergyRecovery = false;
       }
     },
     {
-      name: "waste scrap recycling",
+      name: "scrap recycling",
       description: "regen up to <strong>1%</strong> of max <strong class='color-h'>health</strong> every second<br>active for <strong>5 seconds</strong> after a mob <strong>dies</strong>",
       maxCount: 1,
       count: 0,
@@ -356,6 +377,24 @@ const b = {
       },
       effect() {
         b.isModHealthRecovery = true;
+      },
+      remove() {
+        b.isModHealthRecovery = false;
+      }
+    },
+    {
+      name: "acute stress response",
+      description: "increase <strong class='color-d'>damage</strong> by <strong>50%</strong><br>no <strong class='color-f'>energy</strong> for <strong>5 seconds</strong> after a mob <strong>dies</strong>",
+      maxCount: 1,
+      count: 0,
+      allowed() {
+        return b.isModHealthRecovery
+      },
+      effect() {
+        b.isModEnergyLoss = true;
+      },
+      remove() {
+        b.isModEnergyLoss = false;
       }
     },
     {
@@ -370,6 +409,11 @@ const b = {
         b.modSquirrelFx += 0.2;
         mech.Fx = 0.016 * b.modSquirrelFx;
         mech.jumpForce += 0.038;
+      },
+      remove() {
+        b.modSquirrelFx = 1;
+        mech.Fx = 0.016; //if this changes update the values in  definePlayerMass
+        mech.jumpForce = 0.42; //was 0.38 at 0.0019 gravity
       }
     },
     {
@@ -382,6 +426,9 @@ const b = {
       },
       effect() {
         b.isModStomp = true
+      },
+      remove() {
+        b.isModStomp = false;
       }
     },
     {
@@ -395,6 +442,9 @@ const b = {
       effect() {
         b.modCollisionImmuneCycles += 120;
         mech.collisionImmune = mech.cycle + b.modCollisionImmuneCycles; //player is immune to collision damage for 30 cycles
+      },
+      remove() {
+        b.modCollisionImmuneCycles = 30;
       }
     },
     {
@@ -407,6 +457,9 @@ const b = {
       },
       effect() {
         b.isModAnnihilation = true
+      },
+      remove() {
+        b.isModAnnihilation = false;
       }
     },
     {
@@ -420,6 +473,9 @@ const b = {
       effect() {
         b.isModPiezo = true;
         mech.fieldMeter = mech.fieldEnergyMax;
+      },
+      remove() {
+        b.isModPiezo = false;
       }
     },
     {
@@ -433,6 +489,9 @@ const b = {
       effect() {
         b.modEnergySiphon += 0.15;
         mech.fieldMeter = mech.fieldEnergyMax
+      },
+      remove() {
+        b.modEnergySiphon = 0;
       }
     },
     {
@@ -445,6 +504,9 @@ const b = {
       },
       effect() {
         b.modHealthDrain += 0.015;
+      },
+      remove() {
+        b.modHealthDrain = 0;
       }
     },
     {
@@ -458,6 +520,9 @@ const b = {
       effect() {
         mech.fieldEnergyMax += 0.5
         mech.fieldMeter += 0.5
+      },
+      remove() {
+        mech.fieldEnergyMax = 1;
       }
     },
     {
@@ -471,6 +536,9 @@ const b = {
       effect() {
         mech.maxHealth += 0.50
         mech.addHealth(0.50)
+      },
+      remove() {
+        mech.maxHealth = 1;
       }
     },
     {
@@ -483,6 +551,9 @@ const b = {
       },
       effect() {
         b.modRecursiveHealing += 1
+      },
+      remove() {
+        b.modRecursiveHealing = 1;
       }
     },
     {
@@ -496,6 +567,9 @@ const b = {
       effect: () => {
         b.isModMassEnergy = true // used in mech.grabPowerUp
         mech.fieldMeter = mech.fieldEnergyMax * 2
+      },
+      remove() {
+        b.isModMassEnergy = false;
       }
     },
     {
@@ -508,6 +582,9 @@ const b = {
       },
       effect() {
         b.isModImmortal = true;
+      },
+      remove() {
+        b.isModImmortal = false;
       }
     },
     {
@@ -520,6 +597,9 @@ const b = {
       },
       effect: () => {
         b.isModBayesian = 0.20;
+      },
+      remove() {
+        b.isModBayesian = 0;
       }
     },
     {
@@ -532,6 +612,9 @@ const b = {
       },
       effect: () => {
         b.isModAmmoFromHealth = 0.03;
+      },
+      remove() {
+        b.isModAmmoFromHealth = 0;
       }
     },
     {
@@ -552,6 +635,9 @@ const b = {
           powerUps.spawn(mech.pos.x, mech.pos.y, "heal");
           if (Math.random() < b.isModBayesian) powerUps.spawn(mech.pos.x, mech.pos.y, "heal");
         }
+      },
+      remove() {
+        b.isModNoAmmo = false;
       }
     },
     {
@@ -564,6 +650,9 @@ const b = {
       },
       effect: () => {
         b.isModFourOptions = true;
+      },
+      remove() {
+        b.isModFourOptions = false;
       }
     },
     {
@@ -582,6 +671,9 @@ const b = {
         }
         b.setModDefaults(); // remove all mods
         //have state is checked in mech.death()
+      },
+      remove() {
+        //nothing to undo
       }
     },
     {
@@ -594,6 +686,9 @@ const b = {
       },
       effect() {
         b.isModDroneCollide = true
+      },
+      remove() {
+        b.isModDroneCollide = true;
       }
     },
     {
@@ -606,6 +701,9 @@ const b = {
       },
       effect() {
         b.isModFastSpores = true
+      },
+      remove() {
+        b.isModFastSpores = false
       }
     },
     {
@@ -618,6 +716,9 @@ const b = {
       },
       effect() {
         b.modSuperBallNumber++
+      },
+      remove() {
+        b.modSuperBallNumber = 4;
       }
     },
     {
@@ -632,6 +733,11 @@ const b = {
         b.modLaserReflections++;
         b.modLaserDamage += 0.010; //base is 0.05
         b.modLaserFieldDrain += 0.0004 //base is 0.002
+      },
+      remove() {
+        b.modLaserReflections = 2;
+        b.modLaserDamage = 0.05;
+        b.modLaserFieldDrain = 0.002;
       }
     },
     {
@@ -646,6 +752,11 @@ const b = {
         for (i = 0, len = b.guns.length; i < len; i++) { //find which gun is flak
           if (b.guns[i].name === "flak") b.guns[i].ammoPack = b.guns[i].defaultAmmoPack * (2 + this.count);
         }
+      },
+      remove() {
+        for (i = 0, len = b.guns.length; i < len; i++) { //find which gun is flak
+          if (b.guns[i].name === "flak") b.guns[i].ammoPack = b.guns[i].defaultAmmoPack;
+        }
       }
     },
     // {
@@ -1551,7 +1662,7 @@ const b = {
       name: "fléchettes", //3
       description: "fire a volley of <strong>precise</strong> high velocity needles",
       ammo: 0,
-      ammoPack: 20,
+      ammoPack: 22,
       have: false,
       isStarterGun: true,
       count: 0, //used to track how many shots are in a volley before a big CD
@@ -1572,7 +1683,7 @@ const b = {
         const me = bullet.length;
         bullet[me] = Bodies.rectangle(mech.pos.x + 40 * Math.cos(mech.angle), mech.pos.y + 40 * Math.sin(mech.angle), 45 * b.modBulletSize, 1.4 * b.modBulletSize, b.fireAttributes(mech.angle));
         bullet[me].endCycle = game.cycle + 180;
-        bullet[me].dmg = 1.1;
+        bullet[me].dmg = 1.15;
         bullet[me].do = function () {
           if (this.speed < 10) this.force.y += this.mass * 0.0003; //no gravity until it slows don to improve aiming
         };
diff --git a/js/game.js b/js/game.js
index d34b5e1..9ee2aff 100644
--- a/js/game.js
+++ b/js/game.js
@@ -436,12 +436,12 @@ const game = {
       if (b.guns[i].ammo != Infinity) b.guns[i].ammo = 0;
     }
     b.activeGun = null;
-    b.setModDefaults(); //remove mods
+
+    b.removeAllMods(); //sets mods to defauls values
     game.updateModHUD();
     mech.maxHealth = 1
     mech.fieldEnergyMax = 1
     game.paused = false;
-    build.isShowingBuilds = false
     engine.timing.timeScale = 1;
     game.fpsCap = game.fpsCapDefault;
     game.makeGunHUD();
@@ -460,6 +460,7 @@ const game = {
     game.CDScale = 1;
     game.difficulty = 0;
     game.difficultyMode = Number(document.getElementById("difficulty-select").value)
+    level.isBuildRun = false;
     if (game.difficultyMode === 0) {
       game.isEasyMode = true;
       game.difficultyMode = 1
@@ -490,7 +491,6 @@ const game = {
     document.getElementById("build-grid").style.display = "none"
     document.getElementById("pause-grid-left").style.display = "none"
     document.getElementById("pause-grid-right").style.display = "none"
-    isShowingBuilds = false
     document.getElementById("splash").style.display = "inline";
     document.getElementById("dmg").style.display = "none";
     document.getElementById("health-bg").style.display = "none";
@@ -499,9 +499,11 @@ const game = {
   fpsInterval: 0, //set in startGame
   then: null,
   startGame() {
-    level.isBuildRun = false; //can get set back to true in build.startBuildRun()
+    if (!level.isBuildRun) { //if a build run logic flow returns to "build-button").addEventListener
+      document.body.style.cursor = "none";
+      document.body.style.overflow = "hidden"
+    }
     game.onTitlePage = false;
-    document.body.style.overflow = "hidden"
     document.getElementById("choose-grid").style.display = "none"
     document.getElementById("build-grid").style.display = "none"
     document.getElementById("info").style.display = "none";
@@ -529,7 +531,6 @@ const game = {
     //   // mech.throwBlock();
     // };
 
-    document.body.style.cursor = "none";
     if (game.firstRun) {
       mech.spawn(); //spawns the player
       b.setModDefaults(); //doesn't run on reset so that gun mods carry over to new runs
@@ -674,6 +675,9 @@ const game = {
         if (b.isModHealthRecovery) {
           mech.addHealth(0.01)
         }
+        if (b.isModEnergyLoss) {
+          mech.fieldMeter = 0.05;
+        }
       }
 
 
diff --git a/js/index.js b/js/index.js
index 387aa9f..3534708 100644
--- a/js/index.js
+++ b/js/index.js
@@ -14,9 +14,13 @@ const cat = {
 
 //build build grid display
 const build = {
-  isShowingBuilds: false,
-  list: [],
   choosePowerUp(who, index, type) {
+
+    //       mech.setField(build.list[i].index)
+    //       b.giveGuns(build.list[i].index)
+    //       b.giveMod(build.list[i].index)
+
+
     if (type === "field" || type === "gun") {
       let isDeselect = false
       //if already click, toggle off
@@ -30,6 +34,7 @@ const build = {
       }
       //check if trying to get a second field
       if (type === "field") {
+        mech.setField(index)
         for (let i = 0; i < build.list.length; i++) {
           if (build.list[i].type === "field") { //if already click, toggle off
             build.list[i].who.style.backgroundColor = "#fff"
@@ -79,9 +84,9 @@ const build = {
     // document.title = `effective starting level: ${build.list.length * game.difficultyMode}`
     // build.calculateCustomDifficulty()
   },
-  makeGrid() {
+  populateGrid() {
     let text = `
-<div style="display: flex; justify-content: space-around; align-items: center;">
+  <div style="display: flex; justify-content: space-around; align-items: center;">
     <svg class="SVG-button" onclick="build.startBuildRun()" width="115" height="51">
       <g stroke='none' fill='#333' stroke-width="2" font-size="40px" font-family="Ariel, sans-serif">
         <text x="18" y="38">start</text>
@@ -94,7 +99,7 @@ const build = {
     </svg>
   </div>
   <div style="align-items: center; text-align:center; font-size: 1.00em; line-height: 220%;background-color:#c4ccd8;">
-  <div>starting level: <input id='starting-level' type="number" step="1" value="0" min="0" max="99"></div>
+    <div>starting level: <input id='starting-level' type="number" step="1" value="0" min="0" max="99"></div>
     <label for="difficulty-select" title="effects: number of mobs, damage done by mobs, damage done to mobs, mob speed, heal effects">difficulty:</label>
     <select name="difficulty-select" id="difficulty-select-custom">
       <option value="0">easy</option>
@@ -110,16 +115,21 @@ const build = {
       text += `<div class="build-grid-module" onclick="build.choosePowerUp(this,${i},'gun')"><div class="grid-title"><div class="circle-grid gun"></div> &nbsp; ${b.guns[i].name}</div> ${b.guns[i].description}</div>`
     }
     for (let i = 0, len = b.mods.length; i < len; i++) {
-      if (b.mods[i].name === "Born rule" || b.mods[i].name === "+1 cardinality" || b.mods[i].name === "leveraged investment") {
+      if (
+        !b.mods[i].allowed() ||
+        b.mods[i].name === "+1 cardinality" || b.mods[i].name === "leveraged investment"
+      ) {
         text += `<div class="build-grid-module" style="opacity:0.3;"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[i].name}</div> ${b.mods[i].description}</div>`
       } else {
         text += `<div class="build-grid-module" onclick="build.choosePowerUp(this,${i},'mod')"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[i].name}</div> ${b.mods[i].description}</div>`
       }
     }
-    const el = document.getElementById("build-grid")
-    el.innerHTML = text
-    el.style.display = "none"
+    document.getElementById("build-grid").innerHTML = text
+  },
+  reset() {
+    build.populateGrid();
 
+    document.getElementById("difficulty-select-custom").value = localSettings.difficultyMode
     document.getElementById("difficulty-select-custom").addEventListener("input", () => {
       document.getElementById("difficulty-select").value = document.getElementById("difficulty-select-custom").value
       game.difficultyMode = Number(document.getElementById("difficulty-select-custom").value)
@@ -127,14 +137,24 @@ const build = {
       localStorage.setItem("localSettings", JSON.stringify(localSettings)); //update local storage
       // build.calculateCustomDifficulty()
     });
-  },
-  reset() {
-    build.list = []
-    build.makeGrid();
+
     document.getElementById("build-grid").style.display = "grid"
     // build.calculateCustomDifficulty()
     document.getElementById("difficulty-select-custom").value = localSettings.difficultyMode
   },
+
+  startBuildRun() {
+    spawn.setSpawnList(); //gives random mobs,  not starter mobs
+    spawn.setSpawnList();
+    const increase = Number(document.getElementById("starting-level").value) * game.difficultyMode
+    level.levelsCleared += increase;
+    level.difficultyIncrease(increase) //increase difficulty based on modes
+    document.body.style.cursor = "none";
+    document.body.style.overflow = "hidden"
+    document.getElementById("build-grid").style.display = "none"
+    game.paused = false;
+    requestAnimationFrame(cycle);
+  },
   pauseGrid() {
     // let text = `<div class="pause-grid-module" style="border:0px;background:none;"></div>`
     let text = `
@@ -161,7 +181,11 @@ const build = {
     text += `<div class="pause-grid-module"><div class="grid-title"><div class="circle-grid field"></div> &nbsp; ${mech.fieldUpgrades[mech.fieldMode].name}</div> ${mech.fieldUpgrades[mech.fieldMode].description}</div>`
     for (let i = 0, len = b.mods.length; i < len; i++) {
       if (b.mods[i].count > 0) {
-        text += `<div class="pause-grid-module"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[i].name}</div> ${b.mods[i].description}</div>`
+        if (b.mods[i].count === 1) {
+          text += `<div class="pause-grid-module"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[i].name}</div> ${b.mods[i].description}</div>`
+        } else {
+          text += `<div class="pause-grid-module"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[i].name} (${b.mods[i].count}x)</div> ${b.mods[i].description}</div>`
+        }
         countMods++
       }
     }
@@ -178,59 +202,20 @@ const build = {
     document.getElementById("pause-grid-left").style.display = "none"
     document.getElementById("pause-grid-right").style.display = "none"
   },
-  // calculateCustomDifficulty() {
-  //   let difficulty = build.list.length * game.difficultyMode
-  //   if (game.difficultyMode === 0) difficulty = build.list.length * 1 - 6
-  //   if (game.difficultyMode === 4) difficulty = build.list.length * 4 + 8
-  //   document.getElementById("starting-level").innerHTML = `starting difficulty: <strong style="font-size:1.05em;">${difficulty}</strong>`
-  // },
-  startBuildRun() {
-    spawn.setSpawnList(); //gives random mobs,  not starter mobs
-    spawn.setSpawnList();
-    game.startGame();
-
-    level.isBuildRun = true;
-    const increase = Number(document.getElementById("starting-level").value) * game.difficultyMode
-    level.levelsCleared += increase;
-    level.difficultyIncrease(increase) //increase difficulty based on modes
-
-    level.onLevel = 1;
-    build.givePowerUps();
-  },
-  givePowerUps() {
-    for (let i = 0; i < build.list.length; i++) {
-      if (build.list[i].type === "field") {
-        mech.setField(build.list[i].index)
-      } else if (build.list[i].type === "gun") {
-        b.giveGuns(build.list[i].index)
-      } else if (build.list[i].type === "mod") {
-        b.giveMod(build.list[i].index)
-      }
-    }
-  }
 }
 
-build.makeGrid();
-
-document.getElementById("build-button").addEventListener("click", () => {
+document.getElementById("build-button").addEventListener("click", () => { //setup build run
   document.getElementById("build-button").style.display = "none";
   const el = document.getElementById("build-grid")
-  if (build.isShowingBuilds) {
-    el.style.display = "none"
-    build.isShowingBuilds = false
-    document.body.style.overflow = "hidden"
-    document.getElementById("info").style.display = 'inline'
-  } else {
-    build.list = []
-    build.reset()
-    // let text = '<p>The difficulty increases by one level for each power up you choose.<br>	<button type="button" id="build-begin-button" onclick="build.startBuildRun()">Begin Run</button></p>'
-    build.isShowingBuilds = true
-    el.style.display = "grid"
-    document.body.style.overflowY = "scroll";
-    document.body.style.overflowX = "hidden";
-    document.getElementById("info").style.display = 'none'
-  }
-  // build.calculateCustomDifficulty()
+  el.style.display = "grid"
+  document.body.style.overflowY = "scroll";
+  document.body.style.overflowX = "hidden";
+  document.getElementById("info").style.display = 'none'
+
+  level.isBuildRun = true;
+  game.startGame(); //starts game, but pauses it
+  game.paused = true;
+  build.reset();
 });
 
 
@@ -243,7 +228,6 @@ if (localSettings) {
 
   game.difficultyMode = localSettings.difficultyMode
   document.getElementById("difficulty-select").value = localSettings.difficultyMode
-  document.getElementById("difficulty-select-custom").value = localSettings.difficultyMode
 
   if (localSettings.fpsCapDefault === 'max') {
     game.fpsCapDefault = 999999999;
@@ -358,7 +342,6 @@ document.getElementById("body-damage").addEventListener("input", () => {
 
 // difficulty-select-custom event listener is set in build.makeGrid
 document.getElementById("difficulty-select").addEventListener("input", () => {
-  document.getElementById("difficulty-select-custom").value = document.getElementById("difficulty-select").value
   game.difficultyMode = Number(document.getElementById("difficulty-select").value)
   localSettings.difficultyMode = game.difficultyMode
   localStorage.setItem("localSettings", JSON.stringify(localSettings)); //update local storage
diff --git a/js/level.js b/js/level.js
index b108d1f..0bdf927 100644
--- a/js/level.js
+++ b/js/level.js
@@ -17,8 +17,9 @@ const level = {
       // b.giveGuns("laser")
       // mech.setField("negative mass field")
       // for (let i = 0; i < 9; i++) {
-      // b.giveMod("waste energy recycling");
-      // b.giveMod("field superposition");
+      // b.giveMod("waste energy recovery");
+      // b.giveMod("scrap recycling");
+      // b.giveMod("acute stress response");
       // }
 
       level.intro(); //starting level
@@ -37,7 +38,6 @@ const level = {
       level[level.levels[level.onLevel]](); //picks the current map from the the levels array
       level.levelAnnounce();
     }
-    // if (level.isBuildRun) build.givePowerUps();
     game.noCameraScroll();
     game.setZoom();
     level.addToWorld(); //add bodies to game engine
@@ -1261,7 +1261,7 @@ const level = {
     level.defaultZoom = 1300
     game.zoomTransition(level.defaultZoom)
 
-    document.body.style.backgroundColor = "#f2f5f3";
+    document.body.style.backgroundColor = "#dcdcde" //"#f2f5f3";
     mech.setPosToSpawn(25, -60); //normal spawn
     //mech.setPosToSpawn(-2000, -1700); // left ledge spawn
     level.enter.x = mech.spawnPos.x - 50;
diff --git a/js/mobs.js b/js/mobs.js
index 04866d0..3b9c11d 100644
--- a/js/mobs.js
+++ b/js/mobs.js
@@ -940,13 +940,14 @@ const mobs = {
           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
+          if (b.isModEnergyLoss) dmg *= 1.5;
           if (b.isModFarAwayDmg) dmg *= 1 + Math.sqrt(Math.max(500, Math.min(3000, this.distanceToPlayer())) - 500) * 0.0067 //up to 50% dmg at max range of 3500
           if (b.modEnergySiphon && dmg !== Infinity) mech.fieldMeter += Math.min(this.health, dmg) * b.modEnergySiphon
           if (b.modHealthDrain && dmg !== Infinity) mech.addHealth(Math.min(this.health, dmg) * b.modHealthDrain)
           this.health -= dmg
           //this.fill = this.color + this.health + ')';
           this.onDamage(dmg); //custom damage effects
-          if (this.health < b.mobDieAtHealth && this.alive) this.death();
+          if (this.health < b.modMobDieAtHealth && this.alive) this.death();
         }
       },
       onDamage() {
diff --git a/js/player.js b/js/player.js
index 1a0ff7a..9712594 100644
--- a/js/player.js
+++ b/js/player.js
@@ -67,7 +67,7 @@ const mech = {
   defaultMass: 5,
   mass: 5,
   FxNotHolding: 0.015,
-  Fx: null, //run Force on ground //0.015 //this is set in b.setModDefaults()
+  Fx: 0.015, //run Force on ground //
   FxAir: 0.016, //run Force in Air
   yOff: 70,
   yOffGoal: 70,
@@ -105,7 +105,7 @@ const mech = {
   Sy: 0, //adds a smoothing effect to vertical only
   Vx: 0,
   Vy: 0,
-  jumpForce: null, //0.38 //this is reset in b.setModDefaults()
+  jumpForce: 0.38, //0.38 //this is reset in b.setModDefaults()
   gravity: 0.0024, //0.0019  //game.g is 0.001
   friction: {
     ground: 0.01,
@@ -653,7 +653,7 @@ const mech = {
   throwChargeRate: 0,
   throwChargeMax: 0,
   fieldShieldingScale: 0,
-  fieldRange: 0,
+  fieldRange: 175,
   fieldArc: 0,
   fieldThreshold: 0,
   calculateFieldThreshold() {
@@ -1375,11 +1375,11 @@ const mech = {
               mech.lookForPickUp();
               mech.pushMobs360();
               //look for nearby objects to make zero-g
-              function zeroG(who, mag = 1.06) {
+              function zeroG(who, range, mag = 1.06) {
                 for (let i = 0, len = who.length; i < len; ++i) {
                   sub = Vector.sub(who[i].position, mech.pos);
                   dist = Vector.magnitude(sub);
-                  if (dist < mech.fieldRange) {
+                  if (dist < range) {
                     who[i].force.y -= who[i].mass * (game.g * mag); //add a bit more then standard gravity
                   }
                 }
@@ -1390,20 +1390,20 @@ const mech = {
               if (keys[83] || keys[40]) { //down
                 player.force.y -= 0.5 * player.mass * mech.gravity;
                 this.fieldDrawRadius = this.fieldDrawRadius * 0.97 + 400 * 0.03;
-                zeroG(powerUp, 0.7);
-                zeroG(body, 0.7);
+                zeroG(powerUp, this.fieldDrawRadius, 0.7);
+                zeroG(body, this.fieldDrawRadius, 0.7);
               } else if (keys[87] || keys[38]) { //up
                 mech.fieldMeter -= 5 * DRAIN;
                 this.fieldDrawRadius = this.fieldDrawRadius * 0.97 + 850 * 0.03;
                 player.force.y -= 1.45 * player.mass * mech.gravity;
-                zeroG(powerUp, 1.38);
-                zeroG(body, 1.38);
+                zeroG(powerUp, this.fieldDrawRadius, 1.38);
+                zeroG(body, this.fieldDrawRadius, 1.38);
               } else {
                 mech.fieldMeter -= DRAIN;
                 this.fieldDrawRadius = this.fieldDrawRadius * 0.97 + 650 * 0.03;
                 player.force.y -= 1.07 * player.mass * mech.gravity; // slow upward drift
-                zeroG(powerUp);
-                zeroG(body);
+                zeroG(powerUp, this.fieldDrawRadius);
+                zeroG(body, this.fieldDrawRadius);
               }
 
               //add extra friction for horizontal motion
diff --git a/todo.txt b/todo.txt
index 6b2b6b5..db34a28 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,4 +1,17 @@
-mod - nano scale field makes spores instead of drones
+************** TODO - n-gon **************
+
+add in requirements to custom mode
+  grey out mods that don't meet requirements
+  make custom undo method for mods
+    this makes toggleing mods on and off easier in custom
+
+mod - acute stress response
+  permanently increase damage by 30%
+    for 5 seconds after a mob dies
+      drain energy down to zero
+
+
+mod - nano-scale field makes spores instead of drones
 
 mod - mines - fire something instead of needles on activation
   foam?, flak?, vacuum bomb, super balls
@@ -36,8 +49,6 @@ mod: shotgun - fire extra shot
 
 mob: targeting laser, then a high speed, no gravity bullet
 
-add recursive mod counts to pause screen
-
 css transition for pause menu
 
 field that pushes everything back, and can destroy smaller blocks
@@ -109,10 +120,6 @@ new map with repeating endlessness
     I tried it, but had trouble getting the camera to adjust to the teleportation
     this can apply to blocks mobs, and power ups as well
     
-field power up effects
-  field allows player to hold and throw living mobs
-    and hack mobs
-
 give mobs more animal-like behaviors
   like rain world
   give mobs something to do when they don't see player