diff --git a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Audio.java b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Audio.java
index a56114c..b6a2252 100644
--- a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Audio.java
+++ b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Audio.java
@@ -14,14 +14,14 @@ public class Audio {
 	private void playSound (String sound) {
 
 		// Path to sound file
-		String soundURL = "/res/sound/" + sound + ".wav";
+		String soundPath = "/res/sound/" + sound + ".wav";
 
 		// Try to load and play sound
 		try {
-			URL audioUrl = this.getClass().getResource(soundURL);
-			assert audioUrl != null;
+			URL soundUrl = this.getClass().getResource(soundPath);
+			assert soundUrl != null;
 
-			AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(audioUrl);
+			AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(soundUrl);
 			Clip clip = AudioSystem.getClip();
 		    clip.open(audioInputStream);
 		    clip.start();
diff --git a/refactoring/flappy-bird/src/main/java/com/example/flappybird/GamePanel.java b/refactoring/flappy-bird/src/main/java/com/example/flappybird/GamePanel.java
index 4bd2b94..b88a775 100644
--- a/refactoring/flappy-bird/src/main/java/com/example/flappybird/GamePanel.java
+++ b/refactoring/flappy-bird/src/main/java/com/example/flappybird/GamePanel.java
@@ -422,12 +422,7 @@ public class GamePanel extends JPanel implements KeyListener, MouseListener {
 
 			// Check if bird hits pipes
 			if (gameBird.isAlive()) {
-				if (p.collide(
-					gameBird.getX(), 
-					gameBird.getY(),
-					gameBird.BIRD_WIDTH,
-					gameBird.BIRD_HEIGHT
-				)) {
+				if (p.collide(gameBird)) {
 					// Kill bird and play sound
 					gameBird.kill();
 					audio.hit();
diff --git a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Highscore.java b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Highscore.java
index f738612..7da3e52 100644
--- a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Highscore.java
+++ b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Highscore.java
@@ -21,11 +21,12 @@ public class Highscore {
 	// Read / Write to file setup
 	private static final String FILE_PATH = "/res/data/highscore.dat";
 
-	private static URL dataURL = Highscore.class.getResource(FILE_PATH);
-	private static File dataFile;
+	private static final URL dataURL = Highscore.class.getResource(FILE_PATH);
+	private static final File dataFile;
 
 	static {
 		try {
+			assert dataURL != null;
 			dataFile = Paths.get(dataURL.toURI()).toFile();
 		} catch (URISyntaxException e) {
 			throw new RuntimeException(e);
@@ -33,7 +34,6 @@ public class Highscore {
 	}
 
 	private static Scanner dataScanner    = null;
-	private static PrintWriter dataWriter = null;
 
 	// Highscore
 	private int bestScore;
@@ -71,7 +71,7 @@ public class Highscore {
 
 		try {
 			// Write new highscore to data file
-			dataWriter = new PrintWriter(FILE_PATH, "UTF-8");
+			PrintWriter dataWriter = new PrintWriter(FILE_PATH, "UTF-8");
 			dataWriter.println(Integer.toString(newBest));
 			dataWriter.close();
 		} catch (FileNotFoundException | UnsupportedEncodingException e) {
diff --git a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Pipe.java b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Pipe.java
index 7edcbdb..76d4fb5 100644
--- a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Pipe.java
+++ b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Pipe.java
@@ -44,27 +44,22 @@ public class Pipe extends HasPosition {
 		super.x += SPEED;
 	}
 
-
 	/**
 	 * Checks for bird colliding with pipe
-	 * 
-	 * @param  nX     Bird x-coordinate
-	 * @param  nY     Bird y-coordinate
-	 * @param  nW     Bird width
-	 * @param  nH     Bird height
+	 *
+	 * @param  bird   The bird.
 	 * @return        If bird is colliding with the pipe
 	 */
-	public boolean collide (int nX, int nY, int nW, int nH) {
-
+	public boolean collide (Bird bird) {
 		// Do not allow bird to jump over pipe
-		if (nX > super.x && nY < 0 && canAwardPoint) {
+		if (bird.getX() > super.x && bird.getY() < 0 && canAwardPoint) {
 			return true;
 		}
 
-		return nX < super.x + WIDTH &&
-				nX + nW > super.x &&
-				nY < super.y + HEIGHT &&
-				nY + nH > super.y;
+		return bird.getX() < super.x + WIDTH &&
+				bird.getX() + bird.BIRD_WIDTH > super.x &&
+				bird.getY() < super.y + HEIGHT &&
+				bird.getY() + bird.BIRD_HEIGHT > super.y;
 	}
 
 	/**
diff --git a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Sprites.java b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Sprites.java
index 92009c2..115b8f7 100644
--- a/refactoring/flappy-bird/src/main/java/com/example/flappybird/Sprites.java
+++ b/refactoring/flappy-bird/src/main/java/com/example/flappybird/Sprites.java
@@ -10,6 +10,7 @@ import java.awt.Graphics2D;
 import java.io.IOException;
 import java.io.File;
 import javax.imageio.ImageIO;
+import java.net.URL;
 import java.util.HashMap;
 
 public class Sprites {
@@ -23,18 +24,20 @@ public class Sprites {
 	private static HashMap<String, Texture> textures = new HashMap<String, Texture>();
 
 	public Sprites () {
-
 		// Try to load sprite sheet, exit program if cannot
-
 		try {
-			spriteSheet = ImageIO.read(this.getClass().getResource("/res/img/spriteSheet.png"));
+			String fontPath = "/res/img/spriteSheet.png";
+			URL fontUrl = this.getClass().getResource(fontPath);
+			assert fontUrl != null;
+
+			spriteSheet = ImageIO.read(fontUrl);
 		} catch (IOException e) {
 			e.printStackTrace();
 			System.out.println("Could not load sprite sheet.");
 			System.exit(-1); // Exit program if file could not be found
 			return;
 		}
-
+		
 		// Backgrounds
 		textures.put("background1", new Texture(resize(spriteSheet.getSubimage(0, 0, 144, 256)),   0, 0));
 		textures.put("background2", new Texture(resize(spriteSheet.getSubimage(146, 0, 144, 256)), 0, 0));
@@ -60,7 +63,7 @@ public class Sprites {
 		textures.put("playButton",   new Texture(resize(spriteSheet.getSubimage(354, 118, 52, 29)), 34, 448));
 		textures.put("leaderboard",  new Texture(resize(spriteSheet.getSubimage(414, 118, 52, 29)), 203, 448));
 		textures.put("rateButton",   new Texture(resize(spriteSheet.getSubimage(465, 1, 31, 18)),   147, 355));
-		
+
 		// Helpful / Text
 		textures.put("newHighscore", new Texture(resize(spriteSheet.getSubimage(112, 501, 16, 7)),  210, 305));
 		textures.put("titleText",    new Texture(resize(spriteSheet.getSubimage(351, 91, 89, 24)),  72, 100));