Bomp

Pushy Walls are enemies that first appeared in Super Mario 64. They are large, living rectangular stones. Their attack is trying to push Mario off the edges of cliffs, as their name implies. Besides being enemies, they are more like obstacles.

Super Mario 64
Pushy Walls appear in Whomp's Fortress and Lethal Lava Land. They have eyes with blue pupils, and a black outline above their eyes. This could be their eyebrows.

Super Mario 64 DS
Pushy Walls appear in the same places as Super Mario 64, since this game is a remake of Super Mario 64. However, the Pushy Wall's appearance is different. It's face looks more a Thwomp's face.

Super Mario Galaxy
In this game, Pushy Walls have an even more Thwomp-like appearance. They can first be found in Buoy Base Galaxy.

Super Mario Galaxy 2
In this game, Pushy Walls look like they did in the prequel, Super Mario Galaxy. They can be found in Fluffy Bluff Galaxy and Throwback Galaxy, a remake of Whomp's Fortress.