A hidden wall is a tile that acts exactly like a wall, but has the appearance of a normal floor. When Chip touches it, it is revealed and looks like a normal wall, but monsters and blocks will not reveal it, although they are subject to it. Note that in the game, the hidden wall looks like floor when not revealed and a wall when revealed; the image shown is the insignia for it in level editors and maps. Note that if a hidden wall is revealed on the lower layer of the grid by Chip under a removable tile or floor, it will also appear as a normal floor space until touched.