diff --git a/spaceinvaders/GameProject/.project b/spaceinvaders/GameProject/.project
index 0a0a9e3..46662e1 100644
--- a/spaceinvaders/GameProject/.project
+++ b/spaceinvaders/GameProject/.project
@@ -14,15 +14,4 @@
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 	</natures>
-	<filteredResources>
-		<filter>
-			<id>1654173149171</id>
-			<name></name>
-			<type>30</type>
-			<matcher>
-				<id>org.eclipse.core.resources.regexFilterMatcher</id>
-				<arguments>node_modules|.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
-			</matcher>
-		</filter>
-	</filteredResources>
 </projectDescription>
diff --git a/spaceinvaders/GameProject/src/base/MovingObjectsGame.java b/spaceinvaders/GameProject/src/base/MovingObjectsGame.java
index 7191923..93ec2ad 100644
--- a/spaceinvaders/GameProject/src/base/MovingObjectsGame.java
+++ b/spaceinvaders/GameProject/src/base/MovingObjectsGame.java
@@ -32,7 +32,6 @@ public class MovingObjectsGame extends GameLoop {
   @Override
   public void defineLevels() {
     this.resetLevels();
-    //this.addLevel(new LevelMovingObjects());
     this.addLevel(new LevelMovingHitObjects());
   }
 
diff --git a/spaceinvaders/GameProject/src/controller/MineController.java b/spaceinvaders/GameProject/src/controller/MineController.java
index 5aa7e83..8558db4 100644
--- a/spaceinvaders/GameProject/src/controller/MineController.java
+++ b/spaceinvaders/GameProject/src/controller/MineController.java
@@ -4,7 +4,14 @@ import gameobjects.GameObject;
 
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
-
+/**
+ * Stops GameObject movement at bottom of level and let it 'fly' in x-direction towards ego object.
+ * If the object flies outside of the level (by x-coordinate) it is removed.
+ * 
+ * The behavior looks like a sinking sea mine, which stays at a certain depth and moves left/right to catch the player.
+ * 
+ *
+ */
 public class MineController extends ObjectController {
   int rad = 3;
 
@@ -17,13 +24,19 @@ public class MineController extends ObjectController {
     this.lineSpeed = lineSpeed;
   }
 
+  /**
+   * Fetches ego object by name 'ego' from current level and determines it's x-position.
+   * The controlled GameObject will move towards this position (in x-direction only).
+   * y-direction speed is reduced to zero, if the objects reached lower bound of level (high y-values).
+   * Only deletes the object if it flies out of visible game area.
+   */
   @Override
   public void updateObject() {
 
     if (gameObject.getY() >= this.getPlayground().getSizeY() - 10) {
       this.gameObject.setVY(0);
       if (xSpeed == 0.) {
-        GameObject ego = getPlayground().getObject("ego");
+        GameObject ego = this.getPlayground().getObject("ego");
         double egoXPos = ego.getX();
         if (egoXPos > this.gameObject.getX()) {
           xSpeed = 50;
@@ -38,9 +51,9 @@ public class MineController extends ObjectController {
     }
     if (this.gameObject.getX() < 0 || (this.gameObject.getX() > this.getPlayground().getSizeX())) {
       logger.debug("deleting" + this.gameObject.getId());
-      getPlayground().deleteObject(this.gameObject.getId());
+      this.getPlayground().deleteObject(this.gameObject.getId());
     }
 
-    applySpeedVector();
+    this.applySpeedVector();
   }
 }
diff --git a/spaceinvaders/GameProject/src/log4j2.xml b/spaceinvaders/GameProject/src/log4j2.xml
index 63b0589..f21f70a 100644
--- a/spaceinvaders/GameProject/src/log4j2.xml
+++ b/spaceinvaders/GameProject/src/log4j2.xml
@@ -20,7 +20,7 @@
 			<appender-ref ref="File" />
 		</root>
 		
-		<Logger name="playground.LevelMovingHitObjects" level="trace">      		
+		<Logger name="base.GameLoop" level="info">      		
     	</Logger>
     	
     	<Logger name="playground" level="info">      		
diff --git a/spaceinvaders/GameProject/src/playground/BreakoutLevelBase.java b/spaceinvaders/GameProject/src/playground/BreakoutLevelBase.java
index 0a67890..79ddd44 100644
--- a/spaceinvaders/GameProject/src/playground/BreakoutLevelBase.java
+++ b/spaceinvaders/GameProject/src/playground/BreakoutLevelBase.java
@@ -127,7 +127,7 @@ public abstract class BreakoutLevelBase extends Playground {
 
     if (this.ego.collisionDetection(ball)) {
       logger.trace("Collision detected of ball and ego");
-      actionIfBallHitsEgo(this.ball, this.ego);
+      this.actionIfBallHitsEgo(this.ball, this.ego);
     }
   }
 
diff --git a/spaceinvaders/GameProject/src/playground/BreakoutLevelBaseAdvanced.java b/spaceinvaders/GameProject/src/playground/BreakoutLevelBaseAdvanced.java
new file mode 100644
index 0000000..1022481
--- /dev/null
+++ b/spaceinvaders/GameProject/src/playground/BreakoutLevelBaseAdvanced.java
@@ -0,0 +1,98 @@
+package playground;
+
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+
+/**
+ * Advanced version of abstract {@link BreakoutLevelBase} providing a complete implementation of
+ * {@link #prepareLevel(String)}. Additionally abstract methods for number of bricks in X and Y
+ * direction are provided as well as abstract methods for brick sizes and start coordinates.
+ * 
+ * @see #calcNrBricksX()
+ * @see #calcNrBricksY()
+ * @see #getBrickSizeX()
+ * @see #getBrickSizeY()
+ * @see #getBrickStartX()
+ * @see #getBrickStartY()
+ *
+ */
+public abstract class BreakoutLevelBaseAdvanced extends BreakoutLevelBase {
+
+  private static Logger logger = LogManager.getLogger(BreakoutLevelBaseAdvanced.class);
+
+
+  /**
+   * provides the number of bricks to be set in horizontal direction.
+   * 
+   * @return positive value of how many bricks are to be next to each other in X direction
+   */
+  protected abstract int calcNrBricksX();
+
+  /**
+   * provides the number of bricks to be set in vertical direction.
+   * 
+   * @return positive value of how many bricks are to be next to each other in Y direction
+   */
+  protected abstract int calcNrBricksY();
+
+  /**
+   * provides the length of one brick.
+   * 
+   * @return positive value of how long a brick should be in X direction.
+   */
+  protected abstract double getBrickSizeX();
+
+  /**
+   * provides the height of one brick.
+   * 
+   * @return positive value of how high a brick should be in Y direction.
+   */
+  protected abstract double getBrickSizeY();
+
+  /**
+   * provides the start coordinate of upper left corner (X value).
+   * 
+   * @return positive value of the X coordinate to use as the starting point of the upper left
+   *         corner of the brick set.
+   */
+  protected abstract double getBrickStartX();
+
+  /**
+   * provides the start coordinate of upper left corner (Y value).
+   * 
+   * @return positive value of the Y coordinate to use as the starting point of the upper left
+   *         corner of the brick set.
+   */
+  protected abstract double getBrickStartY();
+
+
+
+  /**
+   * Prepares a complete Breakout type level and uses the values provided by implementations of
+   * {@link #calcNrBricksX()} and {@link #calcNrBricksY()} to generate the stone matrix. 
+   * Furthermore, it relies on the methods {@link #createEgoObject()}, {@link #createBall} and {@link #createBrick},
+   * which are meant to be overwritten in subclasses. <br>
+   * Attention: For collision detection bricks created by {@link #createBrick(int, int)} need to have the String 'brick' in ID.
+   * 
+   * @see LevelBreakoutBase#prepareLevel(String) for further information.
+   * 
+   * @param level String passes by the game engine (not used currently and can be ignored).
+   * 
+   */
+  @Override
+  public void prepareLevel(String level) {
+
+    for (int y = 0; y < this.calcNrBricksY(); y++) {
+      for (int x = 0; x < this.calcNrBricksX(); x++) {
+        logger.trace("trying to create brick X, Y (" + x + "," + y + ")");
+        this.addObject(this.createBrick(x, y));
+      }
+    }
+    this.ego = this.createEgoObject();
+    this.ball = this.createBall();
+    this.addObject(this.ego);
+    this.addObject(this.ball);
+    logger.info("level preperation succeeded.");
+  }
+
+}