diff --git a/GameProject/src/collider/CircleCollider.java b/GameProject/src/collider/CircleCollider.java
index c968a1b..56743c3 100644
--- a/GameProject/src/collider/CircleCollider.java
+++ b/GameProject/src/collider/CircleCollider.java
@@ -1,6 +1,5 @@
 package collider;
 
-import java.awt.Color;
 import gameobjects.*;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
@@ -17,7 +16,7 @@ public class CircleCollider extends Collider {
   double r;
 
   private static Logger logger = LogManager.getLogger(Collider.class);
-  
+
   /**
    * Constructor which sets the radius to be respected for collisions.
    * 
@@ -48,7 +47,7 @@ public class CircleCollider extends Collider {
   public boolean checkCollisionCircCirc(Collider _c2) throws Exception {
     CircleCollider c2 = (CircleCollider) _c2;
     CircleCollider c1 = this;
-    logger.trace(c1.x + " " + c1.y + " " + c1.r + " " + c2.x + " " + c2.y+ " " + c2.r);
+    logger.trace(c1.x + " " + c1.y + " " + c1.r + " " + c2.x + " " + c2.y + " " + c2.r);
     int kathete1 = (int) (Math.abs(c2.gameobject.getX() - c1.gameobject.getX()));
     int kathete2 = (int) (Math.abs(c2.gameobject.getX() - c1.gameobject.getY()));
     int hypothenuse = (int) (c1.r + c2.r);
@@ -81,8 +80,4 @@ public class CircleCollider extends Collider {
     throw new RuntimeException("Collider type not implemented!");
   }
 
-  private Color color = Color.WHITE;
-
-
-
 }
diff --git a/GameProject/src/collider/Collider.java b/GameProject/src/collider/Collider.java
index 0651db3..81793cd 100644
--- a/GameProject/src/collider/Collider.java
+++ b/GameProject/src/collider/Collider.java
@@ -1,7 +1,5 @@
 package collider;
 
-import java.awt.Graphics2D;
-import java.util.LinkedList;
 import gameobjects.GameObject;
 import playground.Playground;
 import controller.ObjectController;
diff --git a/GameProject/src/collider/RectCollider.java b/GameProject/src/collider/RectCollider.java
index f25e62b..c781c8b 100644
--- a/GameProject/src/collider/RectCollider.java
+++ b/GameProject/src/collider/RectCollider.java
@@ -1,7 +1,5 @@
 package collider;
 
-import java.awt.Color;
-
 import gameobjects.*;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
@@ -13,11 +11,8 @@ public class RectCollider extends Collider {
 
   //double x;
   //double y;
-  //double vx;
-  //double vy;
   double w, h;
 
-  private Color color = Color.WHITE;
   
   private static Logger logger = LogManager.getLogger(RectCollider.class);
 
diff --git a/GameProject/src/controller/EnemyController.java b/GameProject/src/controller/EnemyController.java
index 71e5c7e..9e6aa6c 100644
--- a/GameProject/src/controller/EnemyController.java
+++ b/GameProject/src/controller/EnemyController.java
@@ -1,6 +1,7 @@
 package controller;
 
 
+import playground.Playground;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
 
@@ -27,8 +28,8 @@ public class EnemyController extends ObjectController {
     if (gameObject.getY() >= this.getPlayground().getSizeY()) {
       this.getPlayground().deleteObject(gameObject.getId());
       // add to points counter
-      Integer pts = (Integer) this.getPlayground().getGlobalFlag("points");
-      this.getPlayground().setGlobalFlag("points", pts - 200);
+      Integer pts = (Integer) Playground.getGlobalFlag("points");
+      Playground.setGlobalFlag("points", pts - 200);
     }
 
     applySpeedVector();
diff --git a/GameProject/src/controller/MineController.java b/GameProject/src/controller/MineController.java
index 28a4348..5aa7e83 100644
--- a/GameProject/src/controller/MineController.java
+++ b/GameProject/src/controller/MineController.java
@@ -1,6 +1,5 @@
 package controller;
 
-import controller.ObjectController;
 import gameobjects.GameObject;
 
 import org.apache.logging.log4j.Logger;
diff --git a/GameProject/src/gameobjects/AnimatedGameobject.java b/GameProject/src/gameobjects/AnimatedGameobject.java
index 9105cca..571f59e 100644
--- a/GameProject/src/gameobjects/AnimatedGameobject.java
+++ b/GameProject/src/gameobjects/AnimatedGameobject.java
@@ -1,9 +1,7 @@
 package gameobjects;
 
-import java.util.LinkedList;
 import playground.Playground;
 import playground.Animation;
-import collider.Collider;
 import collider.RectCollider;
 import rendering.*;
 import org.apache.logging.log4j.Logger;
diff --git a/GameProject/src/gameobjects/EgoObject.java b/GameProject/src/gameobjects/EgoObject.java
index b1e5043..442cbec 100644
--- a/GameProject/src/gameobjects/EgoObject.java
+++ b/GameProject/src/gameobjects/EgoObject.java
@@ -3,14 +3,6 @@ package gameobjects;
 
 import java.awt.Color;
 import collider.*;
-import java.awt.Graphics2D;
-import java.awt.image.BufferedImage;
-import java.io.File;
-import java.io.IOException;
-import java.util.LinkedList;
-import javax.imageio.ImageIO;
-import collider.Collider;
-import controller.ObjectController;
 import playground.Playground;
 import rendering.*;
 
diff --git a/GameProject/src/gameobjects/FallingStar.java b/GameProject/src/gameobjects/FallingStar.java
index 17af7b6..d5b0e1a 100644
--- a/GameProject/src/gameobjects/FallingStar.java
+++ b/GameProject/src/gameobjects/FallingStar.java
@@ -8,7 +8,6 @@ import rendering.*;
 
 public class FallingStar extends GameObject {
 
-  private Color color = Color.WHITE;
 
   protected double rad = -1;
 
@@ -16,8 +15,7 @@ public class FallingStar extends GameObject {
   public FallingStar(String id, Playground playground, double x, double y, double vx, double vy,
       Color color, double rad) {
     super(id, playground, x, y, vx, vy);
-    this.rad = rad;
-    this.color = color;
+    this.rad = rad;    
     LinkedList<Collider> cols = new LinkedList<Collider>();
     CircleCollider cc = new CircleCollider("cc", this, rad);
     cols.add(cc);
diff --git a/GameProject/src/gameobjects/RectObject.java b/GameProject/src/gameobjects/RectObject.java
index 8009dc0..78efdb5 100644
--- a/GameProject/src/gameobjects/RectObject.java
+++ b/GameProject/src/gameobjects/RectObject.java
@@ -1,10 +1,8 @@
 package gameobjects;
 
 import java.awt.Color;
-import java.io.File;
 import collider.RectCollider;
 import playground.Playground;
-import playground.SpaceInvadersLevel;
 import rendering.RectArtist;
 
 /**
diff --git a/GameProject/src/gameobjects/TextObject.java b/GameProject/src/gameobjects/TextObject.java
index c5263cb..30fca81 100644
--- a/GameProject/src/gameobjects/TextObject.java
+++ b/GameProject/src/gameobjects/TextObject.java
@@ -1,14 +1,8 @@
 package gameobjects;
 
 import java.awt.Color;
-import java.awt.Font;
-import java.awt.Graphics2D;
-import java.awt.font.FontRenderContext;
-import java.awt.font.TextAttribute;
-import java.text.AttributedString;
 import java.util.LinkedList;
 import collider.*;
-import controller.ObjectController;
 import playground.Playground;
 import rendering.*;
 
diff --git a/GameProject/src/playground/Animation.java b/GameProject/src/playground/Animation.java
index c1c12c6..5b658c0 100644
--- a/GameProject/src/playground/Animation.java
+++ b/GameProject/src/playground/Animation.java
@@ -38,7 +38,6 @@ public class Animation {
 
       String zeile;
       double zeit;
-      int it = 0;
 
       while (scanner.hasNext()) {
         if (scanner.hasNextDouble()) {
@@ -57,7 +56,6 @@ public class Animation {
             logger.warn(file + " not found!!");
           }
 
-          it++;
           logger.trace(basePath.getParent().toString() + "/" + zeile);
         }
       }
diff --git a/GameProject/src/playground/LevelHitTwice.java b/GameProject/src/playground/LevelHitTwice.java
index 241ae9e..f0fc782 100644
--- a/GameProject/src/playground/LevelHitTwice.java
+++ b/GameProject/src/playground/LevelHitTwice.java
@@ -1,11 +1,6 @@
 package playground;
 
-import controller.FallingStarController;
-import gameobjects.EgoObject;
-import gameobjects.FallingStar;
 import gameobjects.GameObject;
-import gameobjects.RectObject;
-import java.awt.Color;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
diff --git a/GameProject/src/playground/SpaceInvadersLevel.java b/GameProject/src/playground/SpaceInvadersLevel.java
index 0d577ea..4d16fb5 100644
--- a/GameProject/src/playground/SpaceInvadersLevel.java
+++ b/GameProject/src/playground/SpaceInvadersLevel.java
@@ -1,6 +1,5 @@
 package playground;
 
-// import utilities.* ;
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics2D;
@@ -237,7 +236,6 @@ public class SpaceInvadersLevel extends Playground {
 
         // check whether all enemies have been destroyed or escaped
         if (enemies.size() == 0) {
-          HighscoreManager hsm = new HighscoreManager();
           HighscoreManager.writeHSToFile((Integer) Playground.getGlobalFlag("points"),
               (Integer) Playground.getGlobalFlag("highscore"));
           this.doneLevel = true;
@@ -487,7 +485,6 @@ public class SpaceInvadersLevel extends Playground {
   }
 
   void createCollectables() {
-    double gameTime = this.getGameTime();
     // create collectables
     for (int i = 0; i < this.calcNrCollect(); i++) {
 
diff --git a/GameProject/src/playground/SpaceInvadersLevelTest.java b/GameProject/src/playground/SpaceInvadersLevelTest.java
index 23c18f4..145028e 100644
--- a/GameProject/src/playground/SpaceInvadersLevelTest.java
+++ b/GameProject/src/playground/SpaceInvadersLevelTest.java
@@ -56,24 +56,24 @@ class SpaceInvadersLevelTest {
   
   @Test
   void testActionIfEnemyIsHitPointsUp() {
-    Integer numPointsBefore = (Integer)myLevel.getGlobalFlag("points");
+    Integer numPointsBefore = (Integer)Playground.getGlobalFlag("points");
     GameObject dummyShot = new RectObject("shot1", myLevel, 0,0,0,0, 12, 12, Color.WHITE);
     GameObject dummyEnemy = new RectObject("ego1", myLevel, 0,0,0,0, 12, 12, Color.BLACK);
     myLevel.addObject(dummyShot);
     myLevel.addObject(dummyEnemy);
     myLevel.actionIfEnemyIsHit(dummyEnemy, dummyShot);;  // this is the call under test
-    Integer numPointsAfter = (Integer)myLevel.getGlobalFlag("points");  // changed?
+    Integer numPointsAfter = (Integer)Playground.getGlobalFlag("points");  // changed?
     assertTrue("numPoints is up +200 after EnemyIsHit", numPointsAfter == numPointsBefore + 200); // points are set +200 , check.
   }
 
   @Test
   void testActionIfEgoObjectIsHitLivesDown() {
-    Integer numLivesBefore = (Integer)myLevel.getGlobalFlag("egoLives");
+    Integer numLivesBefore = (Integer)Playground.getGlobalFlag("egoLives");
     GameObject dummyShot = new RectObject("shot1", myLevel, 0,0,0,0, 12, 12, Color.RED);
     GameObject dummyEgo = new EgoObject("ego1", myLevel, 0,0,0,0, 5);
     myLevel.addObject(dummyShot);
     myLevel.actionIfEgoObjectIsHit(dummyShot, dummyEgo);  // this is the call under test
-    Integer numLivesAfter = (Integer)myLevel.getGlobalFlag("egoLives");  // changed?
+    Integer numLivesAfter = (Integer)Playground.getGlobalFlag("egoLives");  // changed?
     assertTrue("numLives is reduced by one ifEgoIsHit", numLivesAfter == numLivesBefore - 1); // lives is reduced by one
     
   }
diff --git a/GameProject/src/rendering/RectArtist.java b/GameProject/src/rendering/RectArtist.java
index e1ff70e..e6de3b6 100644
--- a/GameProject/src/rendering/RectArtist.java
+++ b/GameProject/src/rendering/RectArtist.java
@@ -23,8 +23,6 @@ public class RectArtist extends Artist {
     // g.drawLine((int) (Math.round(this.getX())), (int) (Math.round(this.getY()-this.height/2.)),
     // (int) Math.round(this.getX()),
     // (int) Math.round(this.getY() + this.height/2.));
-    int x = (int) this.getX();
-    int y = (int) this.getY();
     g.fillRect((int) (this.getX() - this.width / 2.), (int) (this.getY() - this.height / 2.),
         (int) this.width, (int) this.height);
 
diff --git a/GameProject/src/rendering/TextArtist.java b/GameProject/src/rendering/TextArtist.java
index 5c312fd..4d33b45 100644
--- a/GameProject/src/rendering/TextArtist.java
+++ b/GameProject/src/rendering/TextArtist.java
@@ -14,14 +14,19 @@ import java.text.AttributedString;
 public class TextArtist extends Artist {
 
   private String text = null;
-  private int size = 1;
   private Color textColor = null;
   protected double textWidth, textHeight;
   Font serifFont = null;
 
+  /** Constructor to intitialize the TextArtist attributes
+   * 
+   * @param go  GameObject to be used for xy coordinate reference
+   * @param text the text to draw
+   * @param size point size to be used for font "Serif"
+   * @param textColor color to draw the text with (foreground)
+   */
   public TextArtist(GameObject go, String text, int size, Color textColor) {
     super(go);
-    this.size = size;
     this.text = text;
 
     this.serifFont = new Font("Serif", Font.PLAIN, size);
diff --git a/GameProject/src/ui/GameUI.java b/GameProject/src/ui/GameUI.java
index beaad14..ff19226 100644
--- a/GameProject/src/ui/GameUI.java
+++ b/GameProject/src/ui/GameUI.java
@@ -1,6 +1,5 @@
 package ui;
 
-import java.awt.Dimension;
 import java.util.*;
 import javax.swing.JFrame;
 import javax.swing.JMenu;