Block.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Block : MonoBehaviour
{
    [SerializeField] AudioClip destroySound;
    [SerializeField] Sprite[] hitSprites;

    Level level;
    GameStatus score;
    [SerializeField] int timesHit;   // serialized for debug purposes only


    public void Start()
    {
        CountBreakableBlocks();
    }

    private void CountBreakableBlocks()
    {
        level = FindObjectOfType<Level>();

        if (tag == "Breakable")
        {
            level.CountBreakableBlocks();
        }
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (tag == "Breakable")
        {
            OneHit();
        }
    }

    private void OneHit()
    {
        FindObjectOfType<GameStatus>().AddToScore();
        AudioSource.PlayClipAtPoint(destroySound, Camera.main.transform.position);
        timesHit++;
        int maxHits = hitSprites.Length + 1;

        if (timesHit >= maxHits)
        {
            Destroy(gameObject);
            level.DecountBlocks();
        }
        else
        {
            ShowNextHitSprite();
        }
    }

    private void ShowNextHitSprite()
    {
        int spriteIndex = timesHit - 1;
        if (hitSprites[spriteIndex] != null)
        {
            GetComponent<SpriteRenderer>().sprite = hitSprites[spriteIndex];
        }
        else
        {
            Debug.Log("Error: Block Sprite Missing "+ gameObject.name);
        }
    }
}