TO SQUASH: Ball reset.

Assets/Scenes/Game.unity

@@ -1183,6 +1183,7 @@ MonoBehaviour:
   oozeBallPrefab: {fileID: 2828226485849316135, guid: ff4467517111a6d0ab4e5608c8adeee0, type: 3}
   fruitBallPrefab: {fileID: 3086586548818580311, guid: b67974a0c09fbe75aac299e30a0c665b, type: 3}
   gameBoard: {fileID: 297740150}
+  player: {fileID: 1002905792}
 --- !u!4 &240489637
 Transform:
   m_ObjectHideFlags: 0

Assets/Scripts/Game/LevelEnder.cs

@@ -272,8 +272,6 @@ public class LevelEnder : MonoBehaviour
         musicManager.PauseMusic();
 
         yield return new WaitForSeconds(1.0f);
-        
-        player.OnLevelEnd();
 
         // Reenable spawners.
         multiplierSpawner.StartSpawning();
@@ -304,7 +302,10 @@ public class LevelEnder : MonoBehaviour
         levelEndTally.enabled = false;
         levelEndTallyBackground.enabled = false;
 
-        // TODO: Reset balls.
+        // Reset.
+        player.OnLevelEnd();
+        ballSpawner.ResetBalls();
+        worldFiller.ClearWalls();
 
         // Restart music.
         musicManager.ResumeMusic();

Assets/Scripts/Game/Spawners/BallSpawner.cs

@@ -18,12 +18,16 @@ public class BallSpawner : Spawner
 
     public GameObject gameBoard;
 
+    public Player player;
+
     private static WaitForSeconds _waitForSeconds0_5 = new WaitForSeconds(0.5f);
 
     private Queue<System.Action> ballQueue = new Queue<System.Action>();
 
     private Queue<GameObject> balls = new Queue<GameObject>();
 
+    private int basicBallCount = 0;
+
     // Start is called once before the first execution of Update after the MonoBehaviour is created
     void Start()
     {
@@ -31,17 +35,7 @@ public class BallSpawner : Spawner
 
         ballQueue.Enqueue(() => SpawnBall(basicBallPrefab));
         ballQueue.Enqueue(() => SpawnBall(basicBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(basicBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(fruitBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(fruitBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(oozeBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(nuclearBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
-        // ballQueue.Enqueue(() => SpawnBall(eyeBallPrefab));
+        basicBallCount = 2;
 
         StartCoroutine(SpawnBalls());
     }
@@ -74,6 +68,112 @@ public class BallSpawner : Spawner
         }
     }
 
+    public void ResetBalls()
+    {
+        // Clear all balls.
+        int nukeBallCount = 0;
+        int glassBallCount = 0;
+        int eyeBallCount = 0;
+        int oozeBallCount = 0;
+        int fruitBallCount = 0;
+
+        foreach (var ball in balls)
+        {
+            if (ball != null)
+            {
+                if (ball.CompareTag("NuclearBall"))
+                {
+                    nukeBallCount++;
+                }
+                else if (ball.CompareTag("GlassBall"))
+                {
+                    glassBallCount++;
+                }
+                else if (ball.CompareTag("EyeBall"))
+                {
+                    eyeBallCount++;
+                }
+                else if (ball.CompareTag("OozeBall"))
+                {
+                    oozeBallCount++;
+                }
+                else if (ball.CompareTag("FruitBall"))
+                {
+                    fruitBallCount++;
+                }
+                Destroy(ball);
+            }
+        }
+        balls.Clear();
+
+        // Always spawn one basic ball more than in the previous level.
+        basicBallCount++;
+
+        // At special levels force spawn certain types of balls.
+        if (player.level % 5 == 0)
+        {
+            // One nuclear ball each five levels.
+            nukeBallCount++;
+
+            if (player.level >= 10)
+            {
+                // Glass balls after level 10.
+                glassBallCount += Random.Range(1, 3);
+            }
+
+            if (player.level >= 15)
+            {
+                // An extra nuke ball after level 15.
+                nukeBallCount++;
+
+                // Eye balls after level 15.
+                eyeBallCount++;
+            }
+
+            if (player.level >= 20)
+            {
+                // Ooze balls after level 20.
+                oozeBallCount++;
+            }
+
+            // No extra basic ball when a special ball spawns for the first time.
+            basicBallCount--;
+        }
+
+        // Spawn balls.
+        for (int i = 0; i < basicBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(basicBallPrefab));
+        }
+
+        for (int i = 0; i < nukeBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(nuclearBallPrefab));
+        }
+
+        for (int i = 0; i < glassBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
+        }
+
+        for (int i = 0; i < eyeBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(eyeBallPrefab));
+        }
+
+        for (int i = 0; i < oozeBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(oozeBallPrefab));
+        }
+
+        for (int i = 0; i < fruitBallCount; i++)
+        {
+            ballQueue.Enqueue(() => SpawnBall(fruitBallPrefab));
+        }
+
+        StartCoroutine(SpawnBalls());
+    }
+
     private void SpawnBall(GameObject ballPrefab, Vector2? position = null)
     {
         if (ballPrefab == null || gameBoard == null)