diff --git a/.DS_Store b/.DS_Store
index b66c12c..6a82df9 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/index.html b/index.html
index 6f14d4c..0eb7e3b 100644
--- a/index.html
+++ b/index.html
@@ -90,6 +90,11 @@
             <details>
                 <summary>settings</summary>
                 <div style="line-height: 150%;" class="details-div">
+
+                    <label for="seed">randomization seed:</label>
+                    <input type="text" id="seed" name="seed" autocomplete="off" spellcheck="false" minlength="1" size="20" style="width: 120px;">
+                    <br>
+
                     <label for="difficulty-select" title="effects: number of mobs, damage done by mobs, damage done to mobs, mob speed, heal effects">combat difficulty:</label>
                     <select name="difficulty-select" id="difficulty-select" style="background-color: #fff">
                         <option value="1">easy</option>
diff --git a/js/index.js b/js/index.js
index e526a34..8068b04 100644
--- a/js/index.js
+++ b/js/index.js
@@ -1,4 +1,39 @@
 "use strict";
+
+//convert text into numbers for seed
+Math.hash = s => { for (var i = 0, h = 9; i < s.length;) h = Math.imul(h ^ s.charCodeAt(i++), 9 ** 9); return h ^ h >>> 9 }
+
+// const date1 = new Date()
+// Math.seed = date1.getUTCDate() * date1.getUTCFullYear(); // daily seed,  day + year
+// Math.seed = Date.now() //random every time:  just the time in seconds UTC
+Math.seed = Math.floor(Date.now() % 100000000) //random every time:  just the time in seconds UTC
+Math.seededRandom = function(min = 0, max = 1) { // in order to work 'Math.seed' must NOT be undefined
+    Math.seed = (Math.seed * 9301 + 49297) % 233280;
+    return min + Math.seed / 233280 * (max - min);
+}
+document.getElementById("seed").placeholder = Math.seed //display seed in settings
+//Math.seed is set to document.getElementById("seed").value in level.populate level at the start of runs
+// console.log(Math.seed)
+
+
+function shuffle(array) {
+    var currentIndex = array.length,
+        temporaryValue,
+        randomIndex;
+    // While there remain elements to shuffle...
+    while (0 !== currentIndex) {
+        // Pick a remaining element...
+        // randomIndex = Math.floor(Math.random() * currentIndex);
+        randomIndex = Math.floor(Math.seededRandom(0, currentIndex)) //Math.floor(Math.random() * currentIndex);
+        currentIndex -= 1;
+        // And swap it with the current element.
+        temporaryValue = array[currentIndex];
+        array[currentIndex] = array[randomIndex];
+        array[randomIndex] = temporaryValue;
+    }
+    return array;
+}
+
 //collision groups
 //   cat.player | cat.map | cat.body | cat.bullet | cat.powerUp | cat.mob | cat.mobBullet | cat.mobShield | cat.phased
 const cat = {
@@ -36,23 +71,6 @@ const color = { //light
 //     map: "#444",
 // }
 
-function shuffle(array) {
-    var currentIndex = array.length,
-        temporaryValue,
-        randomIndex;
-    // While there remain elements to shuffle...
-    while (0 !== currentIndex) {
-        // Pick a remaining element...
-        randomIndex = Math.floor(Math.random() * currentIndex);
-        currentIndex -= 1;
-        // And swap it with the current element.
-        temporaryValue = array[currentIndex];
-        array[currentIndex] = array[randomIndex];
-        array[randomIndex] = temporaryValue;
-    }
-    return array;
-}
-
 // shrink power up selection menu
 // if (screen.height < 800) {
 //     document.getElementById("choose-grid").style.fontSize = "1em"; //1.3em is normal
diff --git a/js/level.js b/js/level.js
index fdac31c..c01a054 100644
--- a/js/level.js
+++ b/js/level.js
@@ -16,7 +16,6 @@ const level = {
         if (level.levelsCleared === 0) { //this code only runs on the first level
             // m.immuneCycle = Infinity //you can't take damage
             // localSettings.levelsClearedLastGame = 10
-            // spawn.setSpawnList();spawn.setSpawnList();
             // level.difficultyIncrease(30) //30 is near max on hard  //60 is near max on why
             // simulation.isHorizontalFlipped = true
             // m.setField("standing wave")
@@ -222,10 +221,12 @@ const level = {
         }
     },
     populateLevels() {
+        if (document.getElementById("seed").value) Math.seed = Math.hash(document.getElementById("seed").value) //update randomizer seed in case the player changed it
+
         if (simulation.isTraining) {
             level.levels = level.trainingLevels.slice(0) //copy array, not by just by assignment
         } else {
-            simulation.isHorizontalFlipped = (Math.random() < 0.5) ? true : false //if true, some maps are flipped horizontally
+            simulation.isHorizontalFlipped = (Math.seededRandom() < 0.5) ? true : false //if true, some maps are flipped horizontally
             level.levels = level.playableLevels.slice(0) //copy array, not by just by assignment
             if (simulation.isCommunityMaps) {
                 // level.levels.push(level.communityLevels)
@@ -235,8 +236,9 @@ const level = {
             } else {
                 level.levels = shuffle(level.levels); //shuffles order of maps
             }
-            level.levels.splice(Math.floor(level.levels.length * (0.4 + 0.6 * Math.random())), 0, "reservoir"); //add level to the back half of the randomized levels list
-            level.levels.splice(Math.floor(level.levels.length * (0.4 + 0.6 * Math.random())), 0, "reactor"); //add level to the back half of the randomized levels list
+            // level.levels.splice(Math.floor(level.levels.length * (0.4 + 0.6 * Math.random())), 0, "reservoir"); //add level to the back half of the randomized levels list
+            level.levels.splice(Math.floor(Math.seededRandom((level.levels.length) * 0.4, level.levels.length)), 0, "reservoir"); //add level to the back half of the randomized levels list
+            level.levels.splice(Math.floor(Math.seededRandom((level.levels.length) * 0.4, level.levels.length)), 0, "reactor"); //add level to the back half of the randomized levels list
             level.levels.splice(0, 2); //remove 2 levels from the start of the array
             if (!build.isExperimentSelection || (build.hasExperimentalMode && !simulation.isCheating)) { //experimental mode is endless, unless you only have an experiment Tech
                 level.levels.unshift("intro"); //add level to the start of the randomized levels list
@@ -244,6 +246,9 @@ const level = {
                 level.levels.push("final"); //add level to the end of the randomized levels list
             }
         }
+        //set seeded random lists of mobs and bosses
+        for (let i = 0; i < level.levels.length; i++) spawn.mobTypeSpawnOrder.push(spawn.fullPickList[Math.floor(Math.seededRandom(0, spawn.fullPickList.length))])
+        for (let i = 0; i < level.levels.length * 2; i++) spawn.bossTypeSpawnOrder.push(spawn.randomBossList[Math.floor(Math.seededRandom(0, spawn.randomBossList.length))])
     },
     flipHorizontal() {
         const flipX = (who) => {
@@ -2508,8 +2513,6 @@ const level = {
         level.exit.y = -430;
 
         // level.difficultyIncrease(14); //hard mode level 7
-        spawn.setSpawnList();
-        spawn.setSpawnList();
         level.defaultZoom = 1500
         simulation.zoomTransition(level.defaultZoom)
         document.body.style.backgroundColor = color.background //"#ddd";
@@ -3232,8 +3235,6 @@ const level = {
 
         // level.difficultyIncrease(30) //30 is near max on hard  //60 is near max on why
         // m.immuneCycle = Infinity //you can't take damage
-        // spawn.setSpawnList(); //picks a couple mobs types for a themed random mob spawns
-        // spawn.setSpawnList(); //picks a couple mobs types for a themed random mob spawns
 
         simulation.isHorizontalFlipped = true
         if (simulation.isHorizontalFlipped) { //flip the map horizontally
diff --git a/js/player.js b/js/player.js
index 0d86efd..2bc8faa 100644
--- a/js/player.js
+++ b/js/player.js
@@ -961,7 +961,7 @@ const m = {
         }
     },
     setMaxEnergy() {
-        m.maxEnergy = (tech.isMaxEnergyTech ? 0.5 : 1) + tech.bonusEnergy + tech.healMaxEnergyBonus + tech.harmonicEnergy
+        m.maxEnergy = (tech.isMaxEnergyTech ? 0.5 : 1) + tech.bonusEnergy + tech.healMaxEnergyBonus + tech.harmonicEnergy + 2 * tech.isGroundState
         simulation.makeTextLog(`<span class='color-var'>m</span>.<span class='color-f'>maxEnergy</span> <span class='color-symbol'>=</span> ${(m.maxEnergy.toFixed(2))}`)
     },
     fieldMeterColor: "#0cf",
diff --git a/js/powerup.js b/js/powerup.js
index da25f0e..a960fe9 100644
--- a/js/powerup.js
+++ b/js/powerup.js
@@ -566,7 +566,8 @@ const powerUps = {
                 }
             }
             if (options.length > 0) {
-                return options[Math.floor(Math.random() * options.length)]
+                // return options[Math.floor(Math.random() * options.length)]
+                return options[Math.floor(Math.seededRandom(0, options.length))]
             }
         },
         choiceLog: [], //records all previous choice options
@@ -650,7 +651,8 @@ const powerUps = {
                     }
 
                     if (options.length > 0) {
-                        const choose = options[Math.floor(Math.random() * options.length)]
+                        // const choose = options[Math.floor(Math.random() * options.length)]
+                        const choose = options[Math.floor(Math.seededRandom(0, options.length))]
                         const isCount = tech.tech[choose].count > 0 ? `(${tech.tech[choose].count+1}x)` : "";
 
                         if (tech.tech[choose].isFieldTech) {
@@ -813,7 +815,10 @@ const powerUps = {
                 }
             }
             if (options.length > 0) {
-                return options[Math.floor(Math.random() * options.length)]
+                // console.log(`random: ${Math.seededRandom(0, options.length)}`)
+
+                return options[Math.floor(Math.seededRandom(0, options.length))]
+                // return options[Math.floor(Math.random() * options.length)]
             }
         },
         choiceLog: [], //records all previous choice options
diff --git a/js/simulation.js b/js/simulation.js
index 01b517f..7d3f89a 100644
--- a/js/simulation.js
+++ b/js/simulation.js
@@ -658,7 +658,9 @@ const simulation = {
         b.setFireMethod()
         b.setFireCD();
         // simulation.updateTechHUD();
-        powerUps.tech.choiceLog = []
+        powerUps.tech.choiceLog = [];
+        powerUps.gun.choiceLog = [];
+        powerUps.field.choiceLog = [];
         powerUps.totalPowerUps = 0;
         powerUps.research.count = 0;
         m.setFillColors();
diff --git a/js/spawn.js b/js/spawn.js
index 9551d4a..934ec7f 100644
--- a/js/spawn.js
+++ b/js/spawn.js
@@ -2,12 +2,19 @@
 const spawn = {
     nonCollideBossList: ["cellBossCulture", "bomberBoss", "powerUpBoss", "orbitalBoss", "spawnerBossCulture", "growBossCulture"],
     // other bosses: suckerBoss, laserBoss, tetherBoss,    //these need a particular level to work so they are not included in the random pool
-    randomLevelBoss(x, y, options = [
-        "shieldingBoss", "orbitalBoss", "historyBoss", "shooterBoss", "cellBossCulture", "bomberBoss", "spiderBoss", "launcherBoss", "laserTargetingBoss",
+    randomBossList: ["shieldingBoss", "orbitalBoss", "historyBoss", "shooterBoss", "cellBossCulture", "bomberBoss", "spiderBoss", "launcherBoss", "laserTargetingBoss",
         "powerUpBoss", "powerUpBossBaby", "snakeBoss", "streamBoss", "pulsarBoss", "spawnerBossCulture", "grenadierBoss", "growBossCulture", "blinkBoss",
         "snakeSpitBoss", "laserBombingBoss", "blockBoss", "revolutionBoss", "mantisBoss", "slashBoss"
-    ]) {
-        spawn[options[Math.floor(Math.random() * options.length)]](x, y)
+    ],
+    bossTypeSpawnOrder: [], //preset list of boss names calculated at the start of a run by the randomSeed
+    bossTypeSpawnIndex: 0, //increases as the boss type cycles
+    randomLevelBoss(x, y, options = []) {
+        if (options.length === 0) {
+            const boss = spawn.bossTypeSpawnOrder[spawn.bossTypeSpawnIndex++ % spawn.bossTypeSpawnOrder.length]
+            spawn[boss](x, y)
+        } else {
+            spawn[options[Math.floor(Math.random() * options.length)]](x, y)
+        }
     },
     pickList: ["starter", "starter"],
     fullPickList: [
@@ -33,11 +40,17 @@ const spawn = {
         "spawner",
         "ghoster",
     ],
+    mobTypeSpawnOrder: [], //preset list of mob names calculated at the start of a run by the randomSeed
+    mobTypeSpawnIndex: 0, //increases as the mob type cycles
     allowedGroupList: ["spinner", "striker", "springer", "laser", "focuser", "beamer", "exploder", "spawner", "shooter", "launcher", "launcherOne", "stabber", "sniper", "pulsar", "grenadier", "slasher"],
     setSpawnList() { //this is run at the start of each new level to determine the possible mobs for the level
-        //each level has 2 mobs: one new mob and one from the last level
         spawn.pickList.splice(0, 1);
-        spawn.pickList.push(spawn.fullPickList[Math.floor(Math.random() * spawn.fullPickList.length)]);
+        const push = spawn.mobTypeSpawnOrder[spawn.mobTypeSpawnIndex++ % spawn.mobTypeSpawnOrder.length]
+        spawn.pickList.push(push);
+        // if (spawn.mobTypeSpawnIndex > spawn.mobTypeSpawnOrder.length) spawn.mobTypeSpawnIndex = 0
+        //each level has 2 mobs: one new mob and one from the last level
+        // spawn.pickList.splice(0, 1);
+        // spawn.pickList.push(spawn.fullPickList[Math.floor(Math.random() * spawn.fullPickList.length)]);
     },
     spawnChance(chance) {
         return Math.random() < chance + 0.07 * simulation.difficulty && mob.length < -1 + 16 * Math.log10(simulation.difficulty + 1)
diff --git a/js/tech.js b/js/tech.js
index 845653f..062105f 100644
--- a/js/tech.js
+++ b/js/tech.js
@@ -3067,7 +3067,7 @@ const tech = {
         },
         {
             name: "particle collider",
-            description: `<strong>clicking</strong> <strong class='color-m'>tech</strong> while <strong>paused</strong> <strong>ejects</strong> them<br><em><strong>3%</strong> chance to convert your tech into <strong class='color-f'>energy</strong></em>`,
+            description: `<strong>clicking</strong> <strong class='color-m'>tech</strong> while <strong>paused</strong> <strong>ejects</strong> them<br><em><strong>3%</strong> chance to convert that tech into <strong class='color-f'>energy</strong></em>`,
             maxCount: 1,
             count: 0,
             frequency: 1,
diff --git a/todo.txt b/todo.txt
index 5b14171..ebbf4ac 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,20 +1,33 @@
 ******************************************************** NEXT PATCH **************************************************
 
-tech: particle collider - in pause menu clicking a tech ejects it (5% chance to lose the power up and convert into energy)
-  (also works on testing without the tech)
+all runs are now seeded
+seed defaults to the last 8 digits of UTC time in milliseconds
+set a custom randomization seed in settings
+seed controls:
+    at start - boss list, mob type list, level list, horizontal flip
+    during run - tech, gun, field choices, some custom level randomization
+doesn't control: mob spawns, mob size, some minor level differences, specific level boss choices, ammo reward values, specific tech effects
 
-growBoss no longer goes invulnerable
-bounceBoss bullets (on reactor map)
-  do 33% less damage
-  move 50% slower, so they don't fill the entire map
-
-ground state reworked: reduce passive energy regen by 66%, increase max energy by 200
-electronegativity: increase damage by 1% for every 9 -> 8 energy
-acetone peroxide does 300 -> 200% more self harm from explosions
-predator renamed parasitism
+bug fix with ground state
 
 ******************************************************** TODO ********************************************************
 
+make a seed/hash system that controls only the tech/guns/fields shown
+  seed will control:
+    seeded random at start done - random level boss, mob types list, level order, horizontal flip
+    seeded random during run - tech, gun, field choices
+    not seeded random - mob spawns, mob size, minor level differences, custom level boss choices, ammo rewards, tech effect randomness
+      better to only seed things at the start of the run so it doesn't mess with power up choices
+  put a seed display in top right corner of splash menu, or settings?
+    normal seed = full UTC time
+    make option for a daily seed: seed = day+year
+      give 1 extra tech for doing the daily seeded run
+      make the option for the daily run, a secret exit in the intro level?
+    figure out how to convert text into seed
+  display seed in pause menu
+
+tech upgrade to anthropic to make it trigger at 50% life and 0%
+
 JUNK tech: https://bindingofisaacrebirth.fandom.com/wiki/Damocles
 
 cloaking field doesn't show energy over max