diff --git a/src/Engine/GameEngine.java b/src/Engine/GameEngine.java
index 38b396f..2568736 100644
--- a/src/Engine/GameEngine.java
+++ b/src/Engine/GameEngine.java
@@ -19,17 +19,17 @@ import java.util.Vector;
 
 
 public class GameEngine extends MouseAdapter {
-	private final int PIPE_ACC = 10, PIPE_WIDTH = 90;
+	private final int PIPE_ACC = 10, PIPE_WIDTH = 90, PIPE_INTERVAL_TIME = 2000;
 	public boolean gameOn , gameOver, isFirstGame, canScore;
 	private Bird bird;
 	private Vector<Sprite> pipes; //will save all laser shots and asteroids which are currently on the screen.
 	private int pWidth, pHeight;	//panel dimensions
-	private Timer pipeTimer;
+	private Timer pipeTimer;		//interval to create new pipe
 	private Random r;
 	private int score;
 	private BufferedImage sceneImage;
 
-	private Vector<SideScollerBackground> backgrounds;
+	private Vector<SideScollerBackground> backgrounds; //Background elements
 	private Vector<AudioClip> successSounds;
 
 	private AudioClip themeAudioClip;
@@ -50,8 +50,10 @@ public class GameEngine extends MouseAdapter {
 			themeAudioClip = null;
 		}
 
-		if(themeAudioClip != null)
+		if(themeAudioClip != null) {
+
 			themeAudioClip.loop();
+		}
 		r = new Random();
 		sceneImage = new BufferedImage(width, height, Image.SCALE_SMOOTH);
 		loadSuccessSounds();
@@ -67,7 +69,7 @@ public class GameEngine extends MouseAdapter {
 	 */
 	private void startNewGame(){
 		this.gameOn = true;
-		pipeTimer = new Timer(2000, new PipeTimerListener());
+		pipeTimer = new Timer(PIPE_INTERVAL_TIME, new PipeTimerListener());
 		backgrounds = new Vector<>();
 		initBackgrounds();
 		initGame();
@@ -87,13 +89,14 @@ public class GameEngine extends MouseAdapter {
 
 	}
 
+	// Loads soundFX Vector
 	private void loadSuccessSounds(){
 		successSounds = new Vector<>();
 		for (int i = 1 ; i < 5 ; i++){
 			successSounds.add(Applet.newAudioClip(getClass().getResource("/Sounds/pass"+i+".wav")));
 		}
 	}
-
+	//initialize background Sprites
 	private void initBackgrounds(){
 		backgrounds.add(new SideScollerBackground(pWidth, pHeight, 2, "skyLine.png", pWidth, pHeight));
 		backgrounds.add(new SideScollerBackground(pWidth, pHeight, 5, "trees.png", pWidth + 50, pHeight));
@@ -175,6 +178,7 @@ public class GameEngine extends MouseAdapter {
 			pipeTimer.stop();
 		}
 
+		//passed the pipe?
 		if(canScore && !pipes.isEmpty() && bird.getLocX() >= pipes.elementAt(0).getLocX() + pipes.elementAt(0).getSWidth()) {
 			score++;
 			canScore = false;
@@ -223,9 +227,9 @@ public class GameEngine extends MouseAdapter {
 		}
 	}
 
-	public void mouseClicked(MouseEvent e){
+	//mouse clicked starts game Or jumps
+	public void mousePressed(MouseEvent e){
 		if(gameOver){
-//			gameOn = true;
 			this.isFirstGame = false;
 			gameOver = false;
 			initGame();
diff --git a/src/GamePanels/GamePanel.java b/src/GamePanels/GamePanel.java
index 26dac0a..1256cd6 100644
--- a/src/GamePanels/GamePanel.java
+++ b/src/GamePanels/GamePanel.java
@@ -16,7 +16,6 @@ public class GamePanel extends JPanel implements Runnable{
     private final URL startURL= getClass().getResource("/Images/start.png");
 
 
-//    private int width, height;
     private GameEngine engine;
     private JLabel lbl_score, lbl_gameOver, lbl_bg, lbl_start;
 
@@ -51,7 +50,7 @@ public class GamePanel extends JPanel implements Runnable{
         lbl_bg = new JLabel(img_bg);
         lbl_bg.setBounds(0,0,width,height);
 
-
+        //create "start game" & "game over" labels
         img_start = new ImageIcon(startURL);
         lbl_start = new JLabel(img_start);
         lbl_start.setVisible(true);
@@ -119,7 +118,7 @@ public class GamePanel extends JPanel implements Runnable{
 
         g2d.drawImage(engine.getScene(),0,0,this); //Draw the scene
         
-        //Some labels - Score & countDown
+        //Update Score
         lbl_score.setText("SCORE : " + engine.getScore());
     }
 
diff --git a/src/Images/start.png b/src/Images/start.png
index 6f371d1..8815b52 100644
Binary files a/src/Images/start.png and b/src/Images/start.png differ
diff --git a/src/Sprites/Bird.java b/src/Sprites/Bird.java
index 9e907e8..f047d29 100644
--- a/src/Sprites/Bird.java
+++ b/src/Sprites/Bird.java
@@ -8,24 +8,28 @@ package Sprites;
 public class Bird extends Sprite {
 
 
+    private final int ACC = 10, MAX_ANGLE=45;
+
     public Bird(int xPosition, int pWidth, int pHeight, int size){
         super(xPosition, pHeight/2, pWidth, pHeight, 0, "birdSprite.png", 0 ,size, size);
 
     }
 
+    //"pull" sprite down up to ACC speed
     @Override
     public void update() {
-        if(acceleration > -10 ) {
+        if(acceleration > -ACC ) {
             acceleration--;
         }
         locY -= acceleration;
-        if(angle <= 45)
+        if(angle <= MAX_ANGLE)
             angle += 5;
     }
 
+    //bird "jumps" ACC pixels up, and img angle is set to MAX_ANGLE
     public void jump() {
         this.acceleration = 10;
-        angle = -45;
+        angle = -1*MAX_ANGLE;
     }
 
 }
diff --git a/src/Sprites/Pipe.java b/src/Sprites/Pipe.java
index 757e926..92bd821 100644
--- a/src/Sprites/Pipe.java
+++ b/src/Sprites/Pipe.java
@@ -11,6 +11,7 @@ public class Pipe extends Sprite {
 
     }
 
+    //move pipe left
     @Override
     public void update() {
         locX -= acceleration;
diff --git a/src/Sprites/SideScollerBackground.java b/src/Sprites/SideScollerBackground.java
index bee410a..dba9e75 100644
--- a/src/Sprites/SideScollerBackground.java
+++ b/src/Sprites/SideScollerBackground.java
@@ -25,22 +25,8 @@ public class SideScollerBackground extends Sprite {
 
     }
 
-    /*
-	 * resizes image to a set size
-	 */
-    @Override
-    protected void setImageDimensions()
-    {
-        Image tmp = bImage.getScaledInstance(sWidth, sHeight, Image.SCALE_SMOOTH);
-        BufferedImage bi = new BufferedImage(sWidth, sHeight, BufferedImage.TYPE_INT_ARGB);
-
-        Graphics2D g2d = bi.createGraphics();
-        g2d.drawImage(tmp,0,0,null);
-        g2d.dispose();
-        bImage = bi;
-
-    }
 
+    //if a bg element moves pass the screen, it returns to the begining
     @Override
     public void update() {
         locX -= acceleration;
@@ -51,6 +37,7 @@ public class SideScollerBackground extends Sprite {
             locXCopy = pWidth;
     }
 
+    //draws 2 bg instances that follow each other
     @Override
     public void drawSprite(Graphics g, JPanel p){
         super.drawSprite(g,p);
diff --git a/src/Sprites/Sprite.java b/src/Sprites/Sprite.java
index 60bcdf3..47f10c5 100644
--- a/src/Sprites/Sprite.java
+++ b/src/Sprites/Sprite.java
@@ -77,8 +77,18 @@ public abstract class Sprite {
 	 */
 	public double getLocY() {return locY;}
 
+	/**
+	 * returns sprite image width
+	 * @return
+	 * int
+	 */
 	public int getSWidth() {return sWidth;}
 
+	/**
+	 * returns sprite image height
+	 * @return
+	 * int
+	 */
 	public int getsHeight() {return sHeight;}
 
 	/**
@@ -131,17 +141,17 @@ public abstract class Sprite {
 	/**
 	 * its not a bug it's  a feature. actually it just moves a shape that goes beyond the screen to the other side.
 	 */
-	protected void outOfScreeFix(){
-		if(locX < 0 - sWidth)
-			locX = pWidth;
-		else if (locX > pWidth+sWidth)
-			locX = 0-sWidth;
-
-		if(locY < 0 - sHeight)
-			locY = pHeight;
-		else if(locY > pHeight+sHeight)
-			locY = 0-sHeight ;
-	}
+//	protected void outOfScreeFix(){
+//		if(locX < 0 - sWidth)
+//			locX = pWidth;
+//		else if (locX > pWidth+sWidth)
+//			locX = 0-sWidth;
+//
+//		if(locY < 0 - sHeight)
+//			locY = pHeight;
+//		else if(locY > pHeight+sHeight)
+//			locY = 0-sHeight ;
+//	}
 
 	/**
 	 * abstract method for drawing sprite.