diff --git a/res/levels/test.level b/res/levels/test.level
index 1d572bf..2426e07 100644
--- a/res/levels/test.level
+++ b/res/levels/test.level
@@ -1,10 +1,12 @@
 name:Lustiger Levelname
 backgroundMusic:music/bla.wav
-background:FooBackground
+background:StarBackground
 -
-[0-20]
-spawn:EnemyTwo,2,2
-[21-25]
+[0-4]
+spawn:EnemyOne,1,1
+[5-10]
+spawn:EnemyTwo,2,10
+[11-25]
 spawn:EnemyThree,2,4
 spawn:EnemyTwo,5,6
 [26-30]
diff --git a/src/de/teamteamteam/spacescooter/entity/LivingEntity.java b/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
index 2b76b7f..41a6705 100644
--- a/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
+++ b/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
@@ -109,8 +109,7 @@ public abstract class LivingEntity extends CollidableEntity implements Hittable
 	 * The default way the LivingEntity explodes. Override this method for a
 	 * different explosion behaviour.
 	 */
-	public void explode() {
-	}
+	public abstract void explode();
 
 	/**
 	 * The default way the LivingEntity dies. Override this method for a
diff --git a/src/de/teamteamteam/spacescooter/entity/Player.java b/src/de/teamteamteam/spacescooter/entity/Player.java
index 54277da..b6dab6a 100644
--- a/src/de/teamteamteam/spacescooter/entity/Player.java
+++ b/src/de/teamteamteam/spacescooter/entity/Player.java
@@ -126,7 +126,6 @@ public class Player extends ShootingEntity implements KeyboardListener {
 	 */
 	@Override
 	public void explode() {
-		super.explode();
 		SoundSystem.playSound("sounds/abgang.wav");
 	}
 	
diff --git a/src/de/teamteamteam/spacescooter/entity/enemy/Enemy.java b/src/de/teamteamteam/spacescooter/entity/enemy/Enemy.java
index b710091..f7649af 100644
--- a/src/de/teamteamteam/spacescooter/entity/enemy/Enemy.java
+++ b/src/de/teamteamteam/spacescooter/entity/enemy/Enemy.java
@@ -40,7 +40,7 @@ public abstract class Enemy extends ShootingEntity {
 		if(willShoot == true){
 			this.shoot();
 		}
-		if(this.getX() < 0-getWidth()){
+		if(this.getX() < 0-this.getWidth()) {
 			this.remove();
 		}
 	}
diff --git a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyBossMinion.java b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyBossMinion.java
index c6b1731..6ef4a5e 100644
--- a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyBossMinion.java
+++ b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyBossMinion.java
@@ -37,7 +37,6 @@ public class EnemyBossMinion extends Enemy{
 	/**
 	 * Custom MultiExplosion for this enemy.
 	 */
-	@Override
 	public void explode() {
 		new MultiExplosion(this.getX(), this.getY());
 	}
@@ -45,12 +44,12 @@ public class EnemyBossMinion extends Enemy{
 	@Override
 	public void update() {
 		super.update();
-		this.setPosition(this.getX()-1, this.getY());
+		this.transpose(-1, 0);
 		Player player = GameScreen.getPlayer();
 		if(this.getY() < player.getY()){
 			this.newY += ySpeed;
 			this.setPosition(this.getX(), (int) newY);
-		}else if(this.getY() > player.getY()){
+		} else if(this.getY() > player.getY()) {
 			this.newY -= ySpeed;
 			this.setPosition(this.getX(), (int) newY);
 		}
diff --git a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyFour.java b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyFour.java
index e8834ec..cef862e 100644
--- a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyFour.java
+++ b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyFour.java
@@ -3,6 +3,8 @@ package de.teamteamteam.spacescooter.entity.enemy;
 import java.awt.Point;
 import java.util.ArrayList;
 
+import de.teamteamteam.spacescooter.entity.explosion.ExplosionOne;
+
 public class EnemyFour extends Enemy{
 	
 	private ArrayList<Point> points;
@@ -63,5 +65,10 @@ public class EnemyFour extends Enemy{
 			this.remove();
 		}
 	}
+
+	@Override
+	public void explode() {
+		new ExplosionOne(this.getX(), this.getY());
+	}
 	
 }
diff --git a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyOne.java b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyOne.java
index 516c802..2a75ecb 100644
--- a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyOne.java
+++ b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyOne.java
@@ -1,5 +1,7 @@
 package de.teamteamteam.spacescooter.entity.enemy;
 
+import de.teamteamteam.spacescooter.entity.explosion.ExplosionOne;
+
 public class EnemyOne extends Enemy {
 
 	public EnemyOne(int x, int y) {
@@ -20,5 +22,10 @@ public class EnemyOne extends Enemy {
 	public void update() {
 		super.update();
 	}
+
+	@Override
+	public void explode() {
+		new ExplosionOne(this.getX(), this.getY());
+	}
 	
 }
diff --git a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyTwo.java b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyTwo.java
index cdf2189..cd170a4 100644
--- a/src/de/teamteamteam/spacescooter/entity/enemy/EnemyTwo.java
+++ b/src/de/teamteamteam/spacescooter/entity/enemy/EnemyTwo.java
@@ -1,5 +1,6 @@
 package de.teamteamteam.spacescooter.entity.enemy;
 
+import de.teamteamteam.spacescooter.entity.explosion.ExplosionTwo;
 import de.teamteamteam.spacescooter.utility.GameConfig;
 import de.teamteamteam.spacescooter.utility.Random;
 
@@ -28,5 +29,10 @@ public class EnemyTwo extends Enemy{
 			this.remove();
 		}
 	}
+
+	@Override
+	public void explode() {
+		new ExplosionTwo(this.getX(), this.getY());
+	}
 	
 }
diff --git a/src/de/teamteamteam/spacescooter/level/Level.java b/src/de/teamteamteam/spacescooter/level/Level.java
index e99f5d4..fdad64a 100644
--- a/src/de/teamteamteam/spacescooter/level/Level.java
+++ b/src/de/teamteamteam/spacescooter/level/Level.java
@@ -41,7 +41,6 @@ public final class Level {
 	public Level(String levelConfig) {
 		this.levelClock = 0;
 		this.config = Loader.getLevelConfigByFilename(levelConfig);
-		System.out.println(this.config);
 	}
 	
 	
@@ -49,7 +48,7 @@ public final class Level {
 	 * Initialize the level based on the LevelConfig attributes.
 	 */
 	public void doBuildUp() {
-		new StarBackground(0, 50);
+		this.spawnEntityByAvailableName(Entity.availableNames.valueOf(this.config.background), 0, 50);
 		GameScreen.setPlayer(new Player(200, 300));
 	}
 	
@@ -74,8 +73,6 @@ public final class Level {
 		if (Keyboard.isKeyDown(KeyEvent.VK_0)) {
 			new EnemyBoss(400,400);
 		}
-		//Increase levelClock
-		this.levelClock++;
 		//Check whether the current interval is configured
 		int currentIntervalIndex = this.config.getIntervalIndexByCurrentTime(this.levelClock);
 		if(currentIntervalIndex == -1) return; //Nothing to do
@@ -105,6 +102,8 @@ public final class Level {
 				}
 			}
 		}
+		//Increase levelClock
+		this.levelClock++;
 	}
 	
 	/**
@@ -122,6 +121,9 @@ public final class Level {
 	 */
 	private void spawnEntityByAvailableName(Entity.availableNames entity, int x, int y) {
 		switch(entity) {
+			case StarBackground:
+				new StarBackground(x, y);
+				break;
 			case EnemyOne:
 				new EnemyOne(x, y);
 				break;
diff --git a/src/de/teamteamteam/spacescooter/level/LevelConfig.java b/src/de/teamteamteam/spacescooter/level/LevelConfig.java
index 433f1f3..f99facd 100644
--- a/src/de/teamteamteam/spacescooter/level/LevelConfig.java
+++ b/src/de/teamteamteam/spacescooter/level/LevelConfig.java
@@ -93,7 +93,7 @@ public class LevelConfig {
 	 */
 	public int getIntervalIndexByCurrentTime(int time) {
 		for(int[] interval : this.intervalList) {
-			if(interval[0] <= time && interval[1] >= time) {
+			if(time >= interval[0] && time < interval[1]) {
 				return this.intervalList.indexOf(interval);
 			}
 		}
@@ -104,7 +104,6 @@ public class LevelConfig {
 	 * Add a given EntitySpawnRule to the ruleList.
 	 */
 	public void addEntitySpawnRule(int intervalStart, int intervalEnd, String entityName, int amount, int spawnRate) {
-		System.out.println("Adding rule for " + intervalStart + " to " + intervalEnd + ": " + entityName + ", " + amount + ", " + spawnRate);
 		int intervalIndex = this.getIntervalIndexByBorders(intervalStart, intervalEnd);
 		if(intervalIndex == -1) {
 			System.err.println("No Interval for rule found!");