A Mossy Stone Brick Stairs block is a weathered variant of Stone Brick Stairs, featuring a moss-covered texture ideal for ruins, ancient builds, and overgrown structures. It functions as a sloped block for smooth elevation transitions and can be mined fastest using a pickaxe; otherwise, it drops nothing.

Mossy Stone Brick Stairs generate naturally in ruined portals and can be crafted from Mossy Stone Bricks or obtained through stonecutting. Additionally, they can be placed under a note block to produce a bass drum sound.