Brick wall

Brick walls,  also referred to as rocks, are a type of block that appears in Super Mario Bros. 2. Though they are called brick walls, they appear to be composed of packed dirt or rocks. They can only be destroyed by placing a bomb or Bob-omb near them and letting it explode. They commonly appear in underground areas, starting in World 1-1.

In Yume Kōjō: Doki Doki Panic and the original Nintendo Entertainment System version of Super Mario Bros. 2, brick walls can appear in a variety of colors depending on the color palette of the area in which they are found. In the Super Mario All-Stars and Super Mario Advance versions of the game, they are consistently colored a light reddish-brown (more yellowish in Super Mario Advance due to the game's overall lighter palette).