diff --git a/res/levels/test.level b/res/levels/test.level
index 136bdcc..f0e66df 100644
--- a/res/levels/test.level
+++ b/res/levels/test.level
@@ -5,6 +5,7 @@ background:CloudBackground
 -
 [0-4]
 spawn:EnemyOne,1,5
+spawn:StoneOne,4,5
 [4-10]
 spawn:EnemyTwo,1,10
 [10-25]
diff --git a/src/de/teamteamteam/spacescooter/entity/Entity.java b/src/de/teamteamteam/spacescooter/entity/Entity.java
index 0c4a037..5b053f8 100644
--- a/src/de/teamteamteam/spacescooter/entity/Entity.java
+++ b/src/de/teamteamteam/spacescooter/entity/Entity.java
@@ -34,6 +34,8 @@ public abstract class Entity implements Updateable, Paintable {
 		EnemyBoss, EnemyBossMinion,
 		/* Explosions */
 		ExplosionOne, ExplosionTwo, MultiExplosion,
+		/* Stones */
+		StoneOne,
 		/* Items */
 		ItemCredit, ItemHeal, ItemIncreaseDamage, ItemNuke, ItemOneUp, ItemRocket, ItemShield,
 	}
diff --git a/src/de/teamteamteam/spacescooter/entity/LivingEntity.java b/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
index 333ef33..9def9ea 100644
--- a/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
+++ b/src/de/teamteamteam/spacescooter/entity/LivingEntity.java
@@ -3,6 +3,7 @@ package de.teamteamteam.spacescooter.entity;
 import de.teamteamteam.spacescooter.brain.GameConfig;
 import de.teamteamteam.spacescooter.brain.PlayerSession;
 import de.teamteamteam.spacescooter.entity.enemy.Enemy;
+import de.teamteamteam.spacescooter.entity.obstacle.Obstacle;
 import de.teamteamteam.spacescooter.entity.shot.Shot;
 import de.teamteamteam.spacescooter.entity.spi.Collidable;
 import de.teamteamteam.spacescooter.entity.spi.Hittable;
@@ -69,6 +70,10 @@ public abstract class LivingEntity extends CollidableEntity implements Hittable
 				return;
 			this.takeDamage(s.getDamageValue());
 		}
+		if (entity instanceof Obstacle) {
+			Obstacle o = (Obstacle) entity;
+			this.takeDamage(o.getCollisionDamage());
+		}
 		if (entity instanceof Player && (!(this instanceof Player))) {
 			Player player = (Player) entity;
 			this.takeDamage(player.getCollisionDamage());
diff --git a/src/de/teamteamteam/spacescooter/entity/Obstacle.java b/src/de/teamteamteam/spacescooter/entity/Obstacle.java
deleted file mode 100644
index 10527ae..0000000
--- a/src/de/teamteamteam/spacescooter/entity/Obstacle.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package de.teamteamteam.spacescooter.entity;
-
-import de.teamteamteam.spacescooter.entity.spi.Collidable;
-
-/**
- * Obstacles are static or floating things that do damage on collision.
- */
-public abstract class Obstacle extends CollidableEntity {
-
-	public Obstacle(int x, int y) {
-		super(x, y);
-	}
-
-	public void update() {
-		// TODO Auto-generated method stub
-
-	}
-
-	@Override
-	public void collideWith(Collidable entity) {
-		// TODO Auto-generated method stub
-
-	}
-
-}
diff --git a/src/de/teamteamteam/spacescooter/entity/Player.java b/src/de/teamteamteam/spacescooter/entity/Player.java
index 357fff0..8cb2e20 100644
--- a/src/de/teamteamteam/spacescooter/entity/Player.java
+++ b/src/de/teamteamteam/spacescooter/entity/Player.java
@@ -9,6 +9,7 @@ import de.teamteamteam.spacescooter.brain.PlayerSession;
 import de.teamteamteam.spacescooter.control.Keyboard;
 import de.teamteamteam.spacescooter.control.KeyboardListener;
 import de.teamteamteam.spacescooter.entity.enemy.Enemy;
+import de.teamteamteam.spacescooter.entity.obstacle.Obstacle;
 import de.teamteamteam.spacescooter.entity.shot.Shot;
 import de.teamteamteam.spacescooter.entity.spi.Collidable;
 import de.teamteamteam.spacescooter.sound.SoundSystem;
diff --git a/src/de/teamteamteam/spacescooter/entity/obstacle/Obstacle.java b/src/de/teamteamteam/spacescooter/entity/obstacle/Obstacle.java
new file mode 100644
index 0000000..0ce0457
--- /dev/null
+++ b/src/de/teamteamteam/spacescooter/entity/obstacle/Obstacle.java
@@ -0,0 +1,14 @@
+package de.teamteamteam.spacescooter.entity.obstacle;
+
+import de.teamteamteam.spacescooter.entity.CollidableEntity;
+
+/**
+ * Obstacles are static or floating things that do damage on collision.
+ */
+public abstract class Obstacle extends CollidableEntity {
+
+	public Obstacle(int x, int y) {
+		super(x, y);
+	}
+
+}
diff --git a/src/de/teamteamteam/spacescooter/entity/obstacle/StoneOne.java b/src/de/teamteamteam/spacescooter/entity/obstacle/StoneOne.java
new file mode 100644
index 0000000..44cddd5
--- /dev/null
+++ b/src/de/teamteamteam/spacescooter/entity/obstacle/StoneOne.java
@@ -0,0 +1,26 @@
+package de.teamteamteam.spacescooter.entity.obstacle;
+
+import de.teamteamteam.spacescooter.entity.spi.Collidable;
+
+/**
+ * First proof of concept obstacle.
+ * A simple stone that moves to the left.
+ */
+public class StoneOne extends Obstacle {
+
+	public StoneOne(int x, int y) {
+		super(x, y);
+		this.setImage("images/stones/stone01.png");
+		this.setCollisionDamage(9001);
+	}
+
+	public void update() {
+		this.transpose(-1, 0);
+	}
+
+	@Override
+	public void collideWith(Collidable entity) {
+
+	}
+
+}
diff --git a/src/de/teamteamteam/spacescooter/level/Level.java b/src/de/teamteamteam/spacescooter/level/Level.java
index 9f14892..7ebcb7c 100644
--- a/src/de/teamteamteam/spacescooter/level/Level.java
+++ b/src/de/teamteamteam/spacescooter/level/Level.java
@@ -10,6 +10,7 @@ import de.teamteamteam.spacescooter.entity.enemy.EnemyBoss;
 import de.teamteamteam.spacescooter.entity.enemy.EnemyOne;
 import de.teamteamteam.spacescooter.entity.enemy.EnemyThree;
 import de.teamteamteam.spacescooter.entity.enemy.EnemyTwo;
+import de.teamteamteam.spacescooter.entity.obstacle.StoneOne;
 import de.teamteamteam.spacescooter.screen.GameScreen;
 import de.teamteamteam.spacescooter.sound.SoundSystem;
 import de.teamteamteam.spacescooter.utility.Loader;
@@ -140,6 +141,9 @@ public final class Level {
 			case EnemyBoss:
 				new EnemyBoss(x, y);
 				break;
+			case StoneOne:
+				new StoneOne(x, y);
+				break;
 			default:
 				System.err.println("I don't know how to spawn this: " + entity);
 				break;