diff --git a/docs/content.md b/docs/content.md
new file mode 100644
index 0000000..25762c4
--- /dev/null
+++ b/docs/content.md
@@ -0,0 +1,24 @@
+# How to add new content to the game
+
+A small guide so other people also understand how to add content.
+
+## Tower
+
+1. Update Towers.json by adding to the end of the array.
+2. Update TowerType in Defintions.ts
+3. Based of the Tower.sprite value, add projectile folder with appropriate projectiles as .png.
+4. Based of the Tower.sprite value, add the tower sprite into towers folder as a .png.
+5. Add appropriate behaviour in Tower.ts (if statement in update).
+6. Add way to spawn via TowerTab.ts button.
+
+## Creep
+
+1. Update Creeps.json by adding to the end of the array.
+2. Update CreepType in Defintions.ts
+3. Based of the Creep.name value, add creep's walking animations to the same named subfolder in creeps folder.
+4. When using creeps in waves, reference them by their index in the CreepType enum.
+
+## Gem
+
+1. Update Gems.json by adding to the end of the array.
+2. Update GemType in Defintions.ts and make sure Gem.type is CaSe sensitively the same.
diff --git a/public/assets/gems/fire/1.png b/public/assets/gems/Fire/1.png
similarity index 100%
rename from public/assets/gems/fire/1.png
rename to public/assets/gems/Fire/1.png
diff --git a/public/assets/gems/fire/2.png b/public/assets/gems/Fire/2.png
similarity index 100%
rename from public/assets/gems/fire/2.png
rename to public/assets/gems/Fire/2.png
diff --git a/public/assets/json/Gems.json b/public/assets/json/Gems.json
index e69de29..094e1bc 100644
--- a/public/assets/json/Gems.json
+++ b/public/assets/json/Gems.json
@@ -0,0 +1,26 @@
+[
+    {
+        "name": "Fire Gem",
+        "type": "Fire",
+        "totalLevels": 2,
+        "textures": [],
+        "cantCombineWith": [],
+        "specialCombine": ["Yeti"],
+        "genericImprovements": [
+            {
+                "damageUp": 2,
+                "attackSpeedUp": 100,
+                "rangeUp": 0.5,
+                "timeToLiveUp": 0,
+                "pierceUp": 1
+            },
+            {
+                "damageUp": 2,
+                "attackSpeedUp": 100,
+                "rangeUp": 0.5,
+                "timeToLiveUp": 0,
+                "pierceUp": 1
+            }
+        ]
+    }
+]
diff --git a/src/classes/Assets.ts b/src/classes/Assets.ts
index 2579e29..3085c6e 100644
--- a/src/classes/Assets.ts
+++ b/src/classes/Assets.ts
@@ -1,5 +1,5 @@
 import * as PIXI from 'pixi.js';
-import { CreepDefinition, MissionDefinition, TowerDefinition } from './Definitions';
+import { CreepDefinition, GemDefinition, MissionDefinition, TowerDefinition } from './Definitions';
 import { Engine } from './Bastion';
 
 export default class GameAssets {
@@ -36,6 +36,7 @@ export default class GameAssets {
     public static MissionBackgrounds: PIXI.Texture[] = [];
     public static Towers: TowerDefinition[];
     public static Creeps: CreepDefinition[];
+    public static Gems: GemDefinition[];
 
     private static text;
     private static async Load(src) {
@@ -76,57 +77,68 @@ export default class GameAssets {
         Engine.app.stage.addChild(this.text);
 
         await Promise.all([
-            this.Load('/aclonica.woff2'),
-            this.Load('/assets/gui/button_01.png').then((texture) => (this.Button01Texture = texture)),
-            this.Load('/assets/gui/button_02.png').then((texture) => (this.Button02Texture = texture)),
-            this.Load('/assets/gui/button_small.png').then((texture) => (this.ButtonSmallTexture = texture)),
-            this.Load('/assets/gui/frame_01.png').then((texture) => (this.Frame01Texture = texture)),
-            this.Load('/assets/gui/frame_02.png').then((texture) => (this.Frame02Texture = texture)),
-            this.Load('/assets/gui/frame_03.png').then((texture) => (this.Frame03Texture = texture)),
-            this.Load('/assets/gui/frame_04.png').then((texture) => (this.Frame04Texture = texture)),
-            this.Load('/assets/gui/frame_inv.png').then((texture) => (this.FrameInventory = texture)),
-            this.Load('/assets/gui/background_01.png').then((texture) => (this.FrameBackground = texture)),
-            this.Load('/assets/gui/background_02.png').then((texture) => (this.FrameTowerTab = texture)),
-            this.Load('/assets/gui/frame_violet.png').then((texture) => (this.VioletBackground = texture)),
-            this.Load('/assets/gui/frame_red.png').then((texture) => (this.RedBackground = texture)),
-            this.Load('/assets/gui/frame_green.png').then((texture) => (this.GreenBackground = texture)),
-            this.Load('/assets/gui/frame_blue.png').then((texture) => (this.BlueBackground = texture)),
-            this.Load('/assets/gui/heart.png').then((texture) => (this.HealthTexture = texture)),
-            this.Load('/assets/gui/money.png').then((texture) => (this.GoldTexture = texture)),
-            this.Load('/assets/gui/wave.png').then((texture) => (this.WaveTexture = texture)),
-            this.Load('/assets/gui/sword_02.png').then((texture) => (this.SwordsTexture = texture)),
-            this.Load('/assets/gui/title01.png').then((texture) => (this.TitleTexture = texture)),
-            this.Load('/assets/gui/icons/play.png').then((texture) => (this.PlayIconTexture = texture)),
-            this.Load('/assets/gui/icons/pause.png').then((texture) => (this.PauseIconTexture = texture)),
-            this.Load('/assets/gui/icons/exclamation.png').then((texture) => (this.ExclamationIconTexture = texture)),
-            this.Load('/assets/gui/icons/home.png').then((texture) => (this.HomeIconTexture = texture)),
-            this.Load('/assets/gui/icons/hammer.png').then((texture) => (this.HammerIconTexture = texture)),
-            this.Load('/assets/gui/icons/cross.png').then((texture) => (this.XIconTexture = texture)),
-            this.Load('/assets/gui/icons/plus.png').then((texture) => (this.PlusIconTexture = texture)),
+            this.Load('./aclonica.woff2'),
+            this.Load('./assets/gui/button_01.png').then((texture) => (this.Button01Texture = texture)),
+            this.Load('./assets/gui/button_02.png').then((texture) => (this.Button02Texture = texture)),
+            this.Load('./assets/gui/button_small.png').then((texture) => (this.ButtonSmallTexture = texture)),
+            this.Load('./assets/gui/frame_01.png').then((texture) => (this.Frame01Texture = texture)),
+            this.Load('./assets/gui/frame_02.png').then((texture) => (this.Frame02Texture = texture)),
+            this.Load('./assets/gui/frame_03.png').then((texture) => (this.Frame03Texture = texture)),
+            this.Load('./assets/gui/frame_04.png').then((texture) => (this.Frame04Texture = texture)),
+            this.Load('./assets/gui/frame_inv.png').then((texture) => (this.FrameInventory = texture)),
+            this.Load('./assets/gui/background_01.png').then((texture) => (this.FrameBackground = texture)),
+            this.Load('./assets/gui/background_02.png').then((texture) => (this.FrameTowerTab = texture)),
+            this.Load('./assets/gui/frame_violet.png').then((texture) => (this.VioletBackground = texture)),
+            this.Load('./assets/gui/frame_red.png').then((texture) => (this.RedBackground = texture)),
+            this.Load('./assets/gui/frame_green.png').then((texture) => (this.GreenBackground = texture)),
+            this.Load('./assets/gui/frame_blue.png').then((texture) => (this.BlueBackground = texture)),
+            this.Load('./assets/gui/heart.png').then((texture) => (this.HealthTexture = texture)),
+            this.Load('./assets/gui/money.png').then((texture) => (this.GoldTexture = texture)),
+            this.Load('./assets/gui/wave.png').then((texture) => (this.WaveTexture = texture)),
+            this.Load('./assets/gui/sword_02.png').then((texture) => (this.SwordsTexture = texture)),
+            this.Load('./assets/gui/title01.png').then((texture) => (this.TitleTexture = texture)),
+            this.Load('./assets/gui/icons/play.png').then((texture) => (this.PlayIconTexture = texture)),
+            this.Load('./assets/gui/icons/pause.png').then((texture) => (this.PauseIconTexture = texture)),
+            this.Load('./assets/gui/icons/exclamation.png').then((texture) => (this.ExclamationIconTexture = texture)),
+            this.Load('./assets/gui/icons/home.png').then((texture) => (this.HomeIconTexture = texture)),
+            this.Load('./assets/gui/icons/hammer.png').then((texture) => (this.HammerIconTexture = texture)),
+            this.Load('./assets/gui/icons/cross.png').then((texture) => (this.XIconTexture = texture)),
+            this.Load('./assets/gui/icons/plus.png').then((texture) => (this.PlusIconTexture = texture)),
             this.LoadMissions(),
             this.LoadTowers(),
             this.LoadCreeps(),
-            this.LoadGemIcons(),
+            this.LoadGems(),
         ]);
         t.destroy();
         this.text.destroy();
         // Set this.text = true to disallow calling GameAssets.LoadAssets() again
         this.text = true;
     }
-    private static async LoadGemIcons() {
+    private static async LoadGems() {
+        const res = await fetch('./assets/json/Gems.json');
+        const gems = await res.json();
+        this.Gems = gems;
+
+        for (let idx = 0; idx < gems.length; idx++) {
+            const gem = this.Gems[idx];
+            for (let i = 1; i <= gem.totalLevels; i++) {
+                const texture = await this.Load(`./assets/gems/${gem.type}/${i}.png`);
+                gem.textures[i] = texture;
+            }
+        }
         for (let i = 0; i < 7; i++) {
-            this.GemAmountIcons[i] = await this.Load(`/assets/gui/gem_amount_${i}.png`);
+            this.GemAmountIcons[i] = await this.Load(`./assets/gui/gem_amount_${i}.png`);
         }
     }
 
     private static async LoadCreeps() {
-        const res = await fetch('/assets/json/Creeps.json');
+        const res = await fetch('./assets/json/Creeps.json');
         const creeps = await res.json();
         this.Creeps = creeps;
         for (let idx = 0; idx < this.Creeps.length; idx++) {
             const creep = this.Creeps[idx];
             for (let i = 0; i < creep.textureArrayLength; i++) {
-                const texture = await this.Load(`/assets/creeps/${creep.name}/${i}.png`);
+                const texture = await this.Load(`./assets/creeps/${creep.name}/${i}.png`);
                 creep.textures[i] = texture;
             }
         }
@@ -134,20 +146,20 @@ export default class GameAssets {
 
     private static async LoadMissions() {
         // When adding missions, make sure to keep order.
-        GameAssets.Missions = [await this.LoadMission('/assets/missions/mission_01.json')];
+        GameAssets.Missions = [await this.LoadMission('./assets/missions/mission_01.json')];
     }
 
     private static async LoadTowers() {
-        const res = await fetch('/assets/json/Towers.json');
+        const res = await fetch('./assets/json/Towers.json');
         const towers = await res.json();
         this.Towers = towers;
         for (let idx = 0; idx < this.Towers.length; idx++) {
             const tower = this.Towers[idx];
             for (let i = 0; i < tower.projectileTexturesArrayLength; i++) {
-                const projTexture = await this.Load(`/assets/projectiles/${tower.sprite}/${i}.png`);
+                const projTexture = await this.Load(`./assets/projectiles/${tower.sprite}/${i}.png`);
                 tower.projectileTextures[i] = projTexture;
             }
-            tower.texture = await this.Load(`/assets/towers/${tower.sprite}.png`);
+            tower.texture = await this.Load(`./assets/towers/${tower.sprite}.png`);
         }
     }
 
diff --git a/src/classes/Definitions.ts b/src/classes/Definitions.ts
index e3ab53e..4732c34 100644
--- a/src/classes/Definitions.ts
+++ b/src/classes/Definitions.ts
@@ -70,6 +70,24 @@ export type TowerStatsDefinition = {
     range: number;
 };
 
+export type GemDefinition = {
+    name: string;
+    type: GemType;
+    totalLevels: number;
+    textures: PIXI.Texture[];
+    cantCombineWith: GemType[];
+    specialCombine: GemType[];
+    genericImprovements: GenericGemImprovement[];
+};
+
+export type GenericGemImprovement = {
+    damageUp: number;
+    attackSpeedUp: number;
+    rangeUp: number;
+    timeToLiveUp: number;
+    pieceUp: number;
+};
+
 export type PathDefinition = [[row: number, column: number]];
 
 export enum TerrainType {
diff --git a/src/classes/gui/TowerPanel.ts b/src/classes/gui/TowerPanel.ts
index 3038fb6..20ac007 100644
--- a/src/classes/gui/TowerPanel.ts
+++ b/src/classes/gui/TowerPanel.ts
@@ -8,8 +8,8 @@ import { Tower } from '../game/Tower';
 import Gem from '../game/Gem';
 
 class VisualGemSlot extends GuiObject {
+    public iconSprite: PIXI.Sprite;
     private background: PIXI.Sprite;
-    private iconSprite: PIXI.Sprite;
     private i: number = 0;
     constructor(index: number, parent: PIXI.Container, gem: Gem | null) {
         super(true);