diff --git a/core/src/logic/Creature.java b/core/src/logic/Creature.java
index 03bea5d..4327d0e 100644
--- a/core/src/logic/Creature.java
+++ b/core/src/logic/Creature.java
@@ -8,7 +8,7 @@ import java.util.logging.Logger;
 import logic.neural.Brain;
 
 /**
- * A (hopefully) smart biological creature.
+ * A (hopefully) smart biological creature in the simulated world.
  *
  * @author fazo
  */
@@ -24,6 +24,12 @@ public class Creature extends Element implements Runnable {
     private Sight[] sights;
     private Thread workerThread;
 
+    /**
+     * Create a creature with a random mind at given position in space
+     *
+     * @param x
+     * @param y
+     */
     public Creature(float x, float y) {
         super(x, y, default_radius);
         dir = (float) (Math.random() * 2 * Math.PI);
@@ -157,13 +163,14 @@ public class Creature extends Element implements Runnable {
 
     @Override
     public void render(ShapeRenderer s) {
-        // Body
+        // Draw Body
         s.setColor(1 - (hp / max_hp), hp / max_hp, 0, 1);
         s.circle(getX(), getY(), getSize());
-        // Vision
+        // Prepare vision stuff
         double relX = Math.cos(dir), relY = Math.sin(dir);
         float c = 0;
         float eyeX = (float) (relX * getSize() * 0.6f), eyeY = (float) (relY * getSize() * 0.6f);
+        // Draw Sight Lines
         if (Game.get().getWorld().getOptions().getOrDefault("draw_sight_lines", 0f) > 0) {
             for (Sight sight : sights) {
                 if (sight != null) {
@@ -180,19 +187,21 @@ public class Creature extends Element implements Runnable {
                 }
             }
         }
+        // Draw eye
         if (sights[0] == null && sights[1] == null) {
             s.setColor(1, 1, 1, 1);
         } else {
             s.setColor(sights[1] == null ? 0 : 1, sights[0] == null ? 0 : 1, 0, 1);
         }
         s.circle(getX() + eyeX, getY() + eyeY, 3);
-        //FOV
+        // Draw FOV cone
         float degrees = fov * 360f / (float) Math.PI;
         float orient = dir * 180f / (float) Math.PI - degrees / 2;
         if (Game.get().getWorld().getOptions().getOrDefault("draw_view_cones", 0f) > 0) {
             s.setColor(0.3f, 0.3f, 0.3f, 1);
             s.arc((float) eyeX + getX(), (float) eyeY + getY(), sightRange, orient, degrees);
         }
+        // Draw damage/heal marks
         if (hp < prevHp) {
             // Damage mark
             s.set(ShapeRenderer.ShapeType.Filled);
@@ -205,11 +214,17 @@ public class Creature extends Element implements Runnable {
             s.circle(getX(), getY(), 5);
         }
         s.set(ShapeRenderer.ShapeType.Line);
-        // Beak
+        // Draw Beak
         s.setColor(beak / max_beak, 1 - beak / max_beak, 0, 1);
         s.line((float) (relX * getSize() * 0.8f + getX()), (float) (relY * getSize() * 0.8f + getY()), (float) (relX * getSize() * (1.5f + beak / max_beak) + getX()), (float) (relY * getSize() * (1.5f + beak / max_beak) + getY()));
     }
 
+    /**
+     * Store Sight information (what the creature sees) and eat/attack if
+     * applicable
+     *
+     * @return the sight information retrieved
+     */
     public Sight[] interactWithWorld() {
         Sight[] newSights = new Sight[2];
         // Try to see plant
@@ -299,28 +314,21 @@ public class Creature extends Element implements Runnable {
         return newSights;
     }
 
-    public void eat() {
-        eating = false;
-        for (Element e : Game.get().getWorld().getPlants()) {
-            if (overlaps(e)) {
-                eating = true;
-                e.setSize(e.getSize() - 0.1f);
-                if (e.getSize() == 0) {
-                    e.setSize(0);
-                }
-                hp++;
-                fitness++;
-                if (hp > max_hp) {
-                    hp = max_hp;
-                }
-            }
-        }
-    }
-
+    /**
+     * Apply a modification to this creature's health. Can be negative.
+     *
+     * @param amount how much to heal/damage
+     */
     private void heal(float amount) {
         hp += amount;
     }
 
+    /**
+     * Praise this creature by increasing fitness. Can be negative to decrease
+     * fitness
+     *
+     * @param amount how much
+     */
     private void praise(float amount) {
         fitness += amount;
     }
@@ -340,9 +348,11 @@ public class Creature extends Element implements Runnable {
     public void startWorker() {
         workerDone = false;
         if (workerThread == null) {
+            // Create a new thread
             workerThread = new Thread(this);
             workerThread.start();
         } else {
+            // Interrupt current thread, throwing it out of sleep
             workerThread.interrupt();
         }
     }
diff --git a/core/src/logic/Element.java b/core/src/logic/Element.java
index 93d458a..a4e7773 100644
--- a/core/src/logic/Element.java
+++ b/core/src/logic/Element.java
@@ -1,13 +1,9 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package logic;
 
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 
 /**
+ * Represents a dynamic simulation element with a circular shape
  *
  * @author fazo
  */
@@ -15,35 +11,89 @@ public abstract class Element {
 
     private float x, y, size;
 
+    /**
+     * Create an element at given position with given radius. Elements have a
+     * circular shape.
+     *
+     * @param x the x position
+     * @param y the y position
+     * @param size the element body radius
+     */
     public Element(float x, float y, float size) {
         this.x = x;
         this.y = y;
         this.size = size;
     }
 
+    /**
+     * Calculate the distance between the circumference of this element and
+     * another one's, taking into account the size. This means that two elements
+     * whose circumference is touching will have a distance of 0, and two
+     * overlapping elements will have a negative distance
+     *
+     * @param e the element whose distance from this one will be checked
+     * @return the distance from the element. It's 0 if they are just touching,
+     * negative if they are colliding and positive if they are not
+     */
     public float distanceFrom(Element e) {
         return (float) Math.sqrt(Math.pow(e.x - x, 2) + Math.pow(e.y - y, 2)) - getSize() - e.getSize();
     }
 
+    /**
+     * Checks if this element overlaps another one, causing a collision
+     *
+     * @param e the element which position will be checked to see if it overlaps
+     * this one
+     * @return true if the elements are overlapping, causing a collision
+     */
     public boolean overlaps(Element e) {
         return distanceFrom(e) < 0;
     }
 
+    /**
+     * Checks if this element overlaps a circular object, causing a collision
+     *
+     * @param x the position of the center of the circular object
+     * @param y the position of the center of the circular object
+     * @param radius the radius of the circular object
+     * @return true if the object overlaps this one
+     */
     public boolean overlaps(float x, float y, float radius) {
         return (float) Math.sqrt(Math.pow(x - this.x, 2) + Math.pow(y - this.y, 2)) < getSize() + radius;
     }
 
+    /**
+     * Check if a point in space occupies the same space as this object
+     *
+     * @param x the x position of the point to check
+     * @param y the y position of the point to check
+     * @return true if the point is part of this object's area
+     */
     public boolean overlaps(float x, float y) {
         return overlaps(x, y, 1);
     }
 
+    /**
+     * Translate this object is space
+     *
+     * @param deltaX x translation
+     * @param deltaY y translation
+     */
     public void move(float deltaX, float deltaY) {
         x += deltaX;
         y += deltaY;
     }
 
+    /**
+     * Run one iteration of this object's logic
+     */
     public abstract void update();
 
+    /**
+     * Draw this object
+     *
+     * @param s the ShapeRenderer used to draw this object
+     */
     public abstract void render(ShapeRenderer s);
 
     public float getX() {
diff --git a/core/src/logic/Sight.java b/core/src/logic/Sight.java
index e2f8d43..6a0c1de 100644
--- a/core/src/logic/Sight.java
+++ b/core/src/logic/Sight.java
@@ -1,15 +1,12 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package logic;
 
 /**
+ * Stores a sight of an element, as seen from a creature's eye
  *
  * @author fazo
  */
 public class Sight {
+
     private Element seen;
     private float distance, angle;
 
@@ -30,5 +27,5 @@ public class Sight {
     public float getAngle() {
         return angle;
     }
-    
+
 }
diff --git a/core/src/logic/Vegetable.java b/core/src/logic/Vegetable.java
index 6f6f6bb..0ffd711 100644
--- a/core/src/logic/Vegetable.java
+++ b/core/src/logic/Vegetable.java
@@ -1,15 +1,10 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package logic;
 
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.mygdx.game.Game;
 
 /**
- *
+ * Represents a small plant-like vegetable with circular shape
  * @author fazo
  */
 public class Vegetable extends Element {
diff --git a/core/src/logic/World.java b/core/src/logic/World.java
index 036cd49..6fe3dbe 100644
--- a/core/src/logic/World.java
+++ b/core/src/logic/World.java
@@ -1,8 +1,3 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package logic;
 
 import com.mygdx.game.Game;
@@ -18,6 +13,8 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 /**
+ * This class represents an instance of a simulation, its world and its
+ * configuration
  *
  * @author fazo
  */
@@ -40,6 +37,12 @@ public class World implements Runnable {
     private final ArrayList<Vegetable> deadPlants;
     private final ArrayList<Listener> listeners;
 
+    /**
+     * Create a new World. Can be customized with given options.
+     *
+     * @param options customization options. Can be null. See the
+     * "reloadOptions" function for possible options
+     */
     public World(Map<String, Float> options) {
         if (options == null) {
             this.options = new HashMap<String, Float>();
@@ -240,6 +243,10 @@ public class World implements Runnable {
         }
     }
 
+    /**
+     * Applies current options. Uses default alternatives if options are not
+     * provided
+     */
     public void reloadOptions() {
         width = Math.round(options.getOrDefault("world_width", 2000f));
         height = Math.round(options.getOrDefault("world_height", 2000f));
@@ -262,6 +269,14 @@ public class World implements Runnable {
         mutationFactor = options.getOrDefault("nMutationFactor", 1f);
     }
 
+    /**
+     * Spawn a new random element in the world, at a random position.
+     *
+     * @param isCreature true if you want to spawn a creature
+     * @param brainMap the brain configuration. Used if spawning a creature. If
+     * null, a random mind will be created
+     * @return the spawned element
+     */
     private Element spawn(boolean isCreature, float[][][] brainMap) {
         int x, y, r;
         boolean overlaps = false;
@@ -301,6 +316,13 @@ public class World implements Runnable {
         }
     }
 
+    /**
+     * Sets currently select creature to the first creature that overlaps given
+     * coordinates
+     *
+     * @param x the x coordinate of the creature you want to select
+     * @param y the x coordinate of the creature you want to select
+     */
     public void selectCreatureAt(int x, int y) {
         selected = null; // Clear selection
         try {
@@ -314,6 +336,12 @@ public class World implements Runnable {
         }
     }
 
+    /**
+     * Fire an event
+     *
+     * @param eventCode the event code. Look at the Listener class for event
+     * codes.
+     */
     public void fire(int eventCode) {
         for (Listener f : listeners) {
             f.on(eventCode);
diff --git a/core/src/logic/neural/Brain.java b/core/src/logic/neural/Brain.java
index 0311744..d7b12b9 100644
--- a/core/src/logic/neural/Brain.java
+++ b/core/src/logic/neural/Brain.java
@@ -83,7 +83,7 @@ public class Brain {
     }
 
     /**
-     * Draw this brain's status.
+     * Draw this brain's status to the screen.
      *
      * @param s the ShapeRenderer to use for the drawing
      */
@@ -224,6 +224,17 @@ public class Brain {
         }
     }
 
+    /**
+     * Combine this brain with another one's map to get an offspring. The brains
+     * must have identical neuron configuration. There are huge amounts of
+     * combinations, so you can call multiple times to get different children
+     * from the same parents
+     *
+     * @param map the brain to "breed" with this one
+     * @return a child brain from the two brains
+     * @throws Exception if the brains don't have identical neuron and layer
+     * numbers
+     */
     public float[][][] breed(float[][][] map) throws Exception {
         float[][][] res = new float[neurons.length - 1][][];
         if (map.length != neurons.length - 1) {
@@ -237,9 +248,6 @@ public class Brain {
             }
             for (int j = 0; j < neurons[i].length; j++) // neurons per layer
             {
-                // j = 8 not valid for neurons[i][j]. investigate why.
-                //System.out.println(i+" "+j+" | "+neurons[i].length+" "+res[i-1].length+" "+neurons[i][j].getWeights().length);
-                //System.out.println(neurons[i].length +" has to be > "+j);
                 res[i - 1][j] = new float[neurons[i][j].getWeights().length];
                 if (map[i - 1][j].length != neurons[i][j].getWeights().length) {
                     throw new Exception("incompatible brains");
diff --git a/core/src/logic/neural/Neuron.java b/core/src/logic/neural/Neuron.java
index 448a263..ce390da 100644
--- a/core/src/logic/neural/Neuron.java
+++ b/core/src/logic/neural/Neuron.java
@@ -1,8 +1,3 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package logic.neural;
 
 import com.mygdx.game.Log;
@@ -10,6 +5,7 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 /**
+ * A neuron in some brain. See Brain class.
  *
  * @author fazo
  */
@@ -22,10 +18,27 @@ public class Neuron {
     private int layer;
     private Brain brain;
 
+    /**
+     * Create a neuron with given brain, bias, and at the given layer with 0
+     * being the input layer, with random weights
+     *
+     * @param layer the layer in which this neuron is positioned
+     * @param bias the bias of this neuron
+     * @param brain the brain which contains this neuron
+     */
     public Neuron(int layer, float bias, Brain brain) {
         this(layer, bias, brain, null);
     }
 
+    /**
+     * Create a neuron with given brain, bias, and at the given layer with 0
+     * being the input layer, with given weights
+     *
+     * @param layer the layer in which this neuron is positioned
+     * @param bias the bias of this neuron
+     * @param brain the brain which contains this neuron
+     * @param weights the weights to use to configure this neuron
+     */
     public Neuron(int layer, float bias, Brain brain, float[] weights) {
         this.brain = brain;
         this.layer = layer;
@@ -37,6 +50,9 @@ public class Neuron {
         cache = new NeuronCache(this.weights.length);
     }
 
+    /**
+     * Randomize the weights of this neuron
+     */
     private void scramble() {
         // init weights
         if (layer > 0) {
@@ -51,6 +67,14 @@ public class Neuron {
         }
     }
 
+    /**
+     * Compute the output of this neuron using the previous layer. Does nothing
+     * with input neurons. Uses a cache to store the output until it is
+     * invalidated by using the clearCache function. This function is recursive,
+     * meaning it will calculate all necessary neuron outputs to get this one.
+     *
+     * @return the output of this neuron.
+     */
     public float compute() {
         if (isInputNeuron) {
             return output;
@@ -67,16 +91,27 @@ public class Neuron {
                     // This should never happen
                     Logger.getLogger(Neuron.class.getName()).log(Level.SEVERE, null, ex);
                 }
+            } else {
+                Neuron n = brain.getNeurons()[layer - 1][i];
+                float v = n.compute() * weights[i];
+                a += v;
+                cache.put(i, v);
             }
-            Neuron n = brain.getNeurons()[layer - 1][i];
-            a += n.compute() * weights[i];
         }
         // sigmoid function
         float res = (float) (1 / (1 + Math.pow(Math.E, a * -1)));
+        cache.setCachedOutput(res);
         Log.log(Log.DEBUG, "Computed Value " + res + " for neuron");
         return res;
     }
 
+    /**
+     * Get a copy of the weights, with a mutation
+     *
+     * @param mutationProbability controls how many weights actually mutates
+     * @param mutationFactor controls how much weights mutate
+     * @return the new weights
+     */
     public float[] getMutatedWeights(float mutationProbability, float mutationFactor) {
         float[] mutatedWeights = new float[weights.length];
         for (int i = 0; i < weights.length; i++) {
@@ -90,27 +125,10 @@ public class Neuron {
     }
 
     /**
-     * Broken, doesn't work for some reason.
+     * Use this to manually set the output of input neurons
      *
-     * @return
+     * @param output the output you want to set
      */
-    public float[] getInputs() {
-        float inputs[] = new float[weights.length];
-        for (int i = 0; i < inputs.length; i++) {
-            if (cache.has(i)) {
-                try {
-                    inputs[i] = cache.get(i);
-                } catch (Exception ex) {
-                    // Shouldnt happen
-                    Logger.getLogger(Neuron.class.getName()).log(Level.SEVERE, null, ex);
-                }
-            } else {
-                inputs[i] = 0;
-            }
-        }
-        return inputs;
-    }
-
     public void setOutput(float output) {
         isInputNeuron = true;
         this.output = output;
@@ -140,6 +158,11 @@ public class Neuron {
         return weights;
     }
 
+    /**
+     * Change the neuron weights
+     *
+     * @param weights the new weights to put
+     */
     public void setWeights(float[] weights) {
         this.weights = weights;
         // Changing the neuron makes the cache invalid