The Crumbling Block object comes in three different shapes: A basic 1x1 block, a 3x2 units big L shape and a Z shape of the same size. Similarly to the Magnet Platform, a Crumbling Block can be broken by a character jumping on it. However, it has to be damaged this way three times before it crumbles apart. Another special attribute of this object is that it can also be damaged by other impacts, including projectiles, Boxing Gloves and paper planes.
Once broken, a Crumbling Block will not reappear the next round like the Magnet Platform. Instead, it will be gone permanently. The amount of damage a block has taken also carries over to the next round.