TO SQUASH: Added multiplier spawner

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Assets/Scripts/Game/Multiplier.cs

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+using UnityEngine;
+using System.Collections;
+
+public class Multiplier : MonoBehaviour
+{
+    public AudioClip multiplierSound;
+
+    public AudioClip missedSound;
+
+    public AudioClip gotItSound;
+
+    public AudioClip gotHalfSound;
+
+    private int multiplierValue = 0;
+
+    private float multiplierTimer = 0f;
+
+    private float stateTimer = 0f;
+
+    private bool isActive = true;
+
+    private AudioSource audioSource;
+
+    private Animator multiplierAnimator;
+
+    private SpriteRenderer multiplierSpriteRenderer;
+
+    private static float stateDuration = 0.5f;
+
+    private static float multiplierDuration = 30f;
+
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        audioSource = GetComponent<AudioSource>();        
+        multiplierAnimator = GetComponent<Animator>();
+        multiplierSpriteRenderer = GetComponent<SpriteRenderer>();
+
+        audioSource.PlayOneShot(multiplierSound);
+    }
+
+    // Update is called once per frame
+    void FixedUpdate()
+    {
+        stateTimer += Time.fixedDeltaTime;
+        multiplierTimer += Time.fixedDeltaTime;
+
+        if (stateTimer >= stateDuration)
+        {
+            stateTimer = 0f;
+            multiplierValue = ((multiplierValue + 1) % 4);
+            multiplierAnimator.SetInteger("bonus", multiplierValue + 1);
+        }
+
+        if (multiplierTimer >= multiplierDuration && isActive)
+        {
+            isActive = false;
+            audioSource.PlayOneShot(missedSound);
+            multiplierSpriteRenderer.enabled = false;
+            StartCoroutine(DestroyAfterDelay());
+        }
+    }
+
+    private IEnumerator DestroyAfterDelay()
+    {
+        yield return new WaitForSeconds(1.5f);
+        Destroy(gameObject);
+    }
+}

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Assets/Scripts/Game/MultiplierSpawner.cs

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+using UnityEngine;
+
+public class MultiplierSpawner : MonoBehaviour
+{
+    public GameObject multiplierPrefab;
+
+    public SpriteRenderer gameBoardSpriteRenderer;
+
+    private Bounds multiplierBounds;
+
+    private Bounds gameBoardBounds;
+
+    private float spawnTimer = 0f;
+
+    private Vector2 spawnPosition;
+
+    private bool isActive = true;
+
+    private static float spawnProbability = 0.1f;
+
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        gameBoardBounds = gameBoardSpriteRenderer.bounds;
+        multiplierBounds = multiplierPrefab.GetComponent<SpriteRenderer>().bounds;
+        Reset();
+    }
+
+    // Update is called once per frame
+    void FixedUpdate()
+    {
+        spawnTimer += Time.fixedDeltaTime;
+
+        if (spawnTimer >= 1f && isActive)
+        {
+            spawnTimer = 0f;
+            if (Random.value < spawnProbability)
+            {
+                GameObject multiplier = Instantiate(multiplierPrefab, spawnPosition, Quaternion.identity);
+                isActive = false;
+            }
+        }
+    }
+
+    public void Reset()
+    {
+        isActive = true;
+        spawnTimer = 0f;
+        spawnPosition = new Vector2(
+            Random.Range(
+                gameBoardBounds.min.x + multiplierBounds.extents.x, 
+                gameBoardBounds.max.x - multiplierBounds.extents.x
+            ),
+            Random.Range(
+                gameBoardBounds.min.y + multiplierBounds.extents.y, 
+                gameBoardBounds.max.y - multiplierBounds.extents.y
+            )
+        );
+    }
+}

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