Cracked Tile

From Zelda Wiki.org

A cracked tile is always shown in every game that it is weak and can be blown away by a bomb. Once it is blown up, there is either another passageway or a treasure chest. In Ocarina of Time and Majora's mask, these walls, when struck by Link's sword, will make a different sound than an ordinary wall. Cracked tiles high up on walls can only be blown away by a bombchu.