void OnTriggerStay2D(Collider2D other)
{
if (col.bounds.Contains(other.bounds.min) && col.bounds.Contains(other.bounds.max))
{
Rock rock = other.GetComponent <Rock>();
if (rock && !rock.destroyed)
{
rock.DestroyRock(true);
GameplayManager.Instance.ChangeCurrentNumber(operation, rock.number);
}
}
}
