diff --git a/core/src/zero1hd/rhythmbullet/entity/CollisionDetector.java b/core/src/zero1hd/rhythmbullet/entity/CollisionDetector.java
index 1f70491..9bb4933 100755
--- a/core/src/zero1hd/rhythmbullet/entity/CollisionDetector.java
+++ b/core/src/zero1hd/rhythmbullet/entity/CollisionDetector.java
@@ -4,14 +4,8 @@ import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Preferences;
 import com.badlogic.gdx.assets.AssetManager;
 import com.badlogic.gdx.audio.Sound;
-import com.badlogic.gdx.graphics.g2d.Batch;
-import com.badlogic.gdx.graphics.g2d.ParticleEffect;
-import com.badlogic.gdx.graphics.g2d.ParticleEffectPool;
-import com.badlogic.gdx.graphics.g2d.ParticleEffectPool.PooledEffect;
 import com.badlogic.gdx.utils.Array;
 
-import zero1hd.rhythmbullet.RhythmBullet;
-
 public class CollisionDetector {
 	Array<Entity> enemies;
 	Array<Entity> allies;
@@ -19,10 +13,6 @@ public class CollisionDetector {
 	AssetManager assets;
 	Preferences prefs;
 	
-	//Particle pools;
-	ParticleEffectPool explosionEffectPool;
-	Array<PooledEffect> effects = new Array<>();
-	
 	private int amassedPoints;
 	Sound explosionSFX;
 	public CollisionDetector(Array<Entity> enemies, Array<Entity> allies, AssetManager assetManager, Preferences prefs) {
@@ -31,8 +21,6 @@ public class CollisionDetector {
 		assets = assetManager;
 		this.prefs = prefs;
 		
-		explosionEffectPool = new ParticleEffectPool(assets.get("explosion-s.p", ParticleEffect.class), 1, 64);
-		explosionSFX = assets.get("explosion.ogg", Sound.class);
 	}
 	
 	public void collisionCheck() {
@@ -46,17 +34,6 @@ public class CollisionDetector {
 							if (enemy.getHitZone().overlaps(ally.getHitZone())) {
 								Gdx.app.debug("Collision Detector", "Collision between entities: " + enemy.getClass().getSimpleName() + " and " + ally.getClass().getSimpleName());
 								
-								//Play FX;
-								if (ally.playCollideSFX() && enemy.playCollideSFX()) {
-									explosionSFX.play(prefs.getFloat("fx vol")/100f, 1f, (enemy.getX()/RhythmBullet.GAME_AREA_WIDTH));
-								}
-								if (ally.playCollidePFX() && enemy.playCollidePFX()) {
-									PooledEffect currentPFX;
-									currentPFX = explosionEffectPool.obtain();
-									currentPFX.setPosition(ally.getX() + ally.getWidth()/2f, ally.getY() + ally.getHeight()/2f);
-									effects.add(currentPFX);
-								}
-								
 								enemy.collided(ally);
 								ally.collided(enemy);
 								
@@ -71,28 +48,6 @@ public class CollisionDetector {
 	}
 	
 	
-	/**
-	 * draws the explosion particles where necessary.
-	 * @param batch the batch used to draw the said particles
-	 * @param cleanBatch whether this method should call begin and end on the batch.
-	 */
-	public void renderParticles(Batch batch, float delta, boolean cleanBatch) {
-		if (cleanBatch) {
-			batch.begin();
-		}
-		for (int i = 0; i < effects.size; i++) {
-			effects.get(i).draw(batch, delta);
-			if (effects.get(i).isComplete()) {
-				effects.get(i).free();
-				effects.removeIndex(i);
-			}
-		}
-		
-		if (cleanBatch) {
-			batch.end();
-		}
-	}
-	
 	public int getAmassedPoints() {
 		int amassedPoints = this.amassedPoints;
 		this.amassedPoints = 0;
diff --git a/core/src/zero1hd/rhythmbullet/entity/Entity.java b/core/src/zero1hd/rhythmbullet/entity/Entity.java
index 82f98bc..dd27141 100755
--- a/core/src/zero1hd/rhythmbullet/entity/Entity.java
+++ b/core/src/zero1hd/rhythmbullet/entity/Entity.java
@@ -125,14 +125,6 @@ public class Entity extends Actor implements Poolable {
 		super.draw(batch, parentAlpha);
 	}
 	
-	public boolean playCollidePFX() {
-		return true;
-	}
-	
-	public boolean playCollideSFX() {
-		return true;
-	}
-	
 	public void move(float delta, boolean update) {
 		rotRatios.set(MathUtils.cosDeg(angle), MathUtils.sinDeg(angle));
 		moveBy(rotRatios.x*speed*delta, rotRatios.y*speed*delta);
diff --git a/core/src/zero1hd/rhythmbullet/entity/coordinator/Coordinator.java b/core/src/zero1hd/rhythmbullet/entity/coordinator/Coordinator.java
index f048447..78bef87 100755
--- a/core/src/zero1hd/rhythmbullet/entity/coordinator/Coordinator.java
+++ b/core/src/zero1hd/rhythmbullet/entity/coordinator/Coordinator.java
@@ -5,6 +5,11 @@ import com.badlogic.gdx.utils.Pool.Poolable;
 import zero1hd.rhythmbullet.entity.Entity;
 import zero1hd.rhythmbullet.entity.EntityManager;
 
+/**
+ * Coordinator coordinates movement of an entity. Movement can range from basic pre-determined to more advanced (with condition based behavior).
+ * @author Yunyang
+ * 
+ */
 public class Coordinator implements Poolable {
 	private CoordinatorFrame<? extends Coordinator> cf;
 	protected EntityManager em;
diff --git a/core/src/zero1hd/rhythmbullet/entity/coordinator/CoordinatorFrame.java b/core/src/zero1hd/rhythmbullet/entity/coordinator/CoordinatorFrame.java
index e1e8531..439c5f6 100755
--- a/core/src/zero1hd/rhythmbullet/entity/coordinator/CoordinatorFrame.java
+++ b/core/src/zero1hd/rhythmbullet/entity/coordinator/CoordinatorFrame.java
@@ -9,6 +9,12 @@ public class CoordinatorFrame<T extends Coordinator> {
 	private EntityManager em;
 	CoordinatorFrame<T> cf;
 	Class<T> coordinatorType;
+	
+	/**
+	 * Similar to an entityFrame, however this time, for a coordinator.
+	 * @param entityManager
+	 * @param classtype
+	 */
 	public CoordinatorFrame(EntityManager entityManager, Class<T> classtype) {
 		this.em = entityManager;
 		coordinatorType = classtype;