Bomp

Bomps are Thwomp relatives that first appeared in Super Mario 64. They are living, pushing, protruding stones that act as obstacles in many games. Their name is a portmanteau of "bump" and "Thwomp."

Super Mario 64 / Super Mario 64 DS
Bomps made their first appearance in Super Mario 64 and its Nintendo DS remake, Super Mario 64 DS; herein, they are known as Moving Bars, Pushy Walls, or Sliding Stones. They appear in the course Whomp's Fortress. At the beginning of the course, they go through a pattern of pushing, trying to shove Mario off a cliff, and subsequently making him fall down the course's pit. The beginning and end Moving Bar in Whomp's Fortress are thinner than the center one. Their eyes have a blue outline with blue pupils, and a thick black outline along the tops. An eyeless, mechanical version of Moving Bar also appears in Tick Tock Clock. Like the other pieces of the clock, they are affected by how Mario enters the clock and are used as platforms as well as obstacles.

In Super Mario 64 DS, no Moving Bars have eyes, and their moving patterns have been altered to appear more in unison. The Moving Bars in Whomp's Fortress can also be destroyed if hit by a character powered up by a Mushroom.

Super Mario Galaxy
Bomps reappear in Super Mario Galaxy, where they now more closely resemble Thwomps. They appear in the Buoy Base Galaxy and the Freezeflame Galaxy.

Super Mario Galaxy 2
In Super Mario Galaxy 2, they appear with the same role and appearance as in Super Mario Galaxy. They appear in the Fluffy Bluff Galaxy and the Throwback Galaxy, the latter which is a remake of Whomp's Fortress. In the Fluffy Bluff Galaxy, Bomps can assist the player in climbing the slope where they are located, but in the Throwback Galaxy, their purpose is more like that of an obstacle.

Paper Mario: Sticker Star
Bomps make an appearance in Paper Mario: Sticker Star in the Chomp Ruins, retaining their appearance in Super Mario Galaxy. In the game, they are made of cardboard instead of stone. They come out from waterfalls and double doors. An upside-down Bomp appears as a Scrap, and it must be flipped over using Paperization so that Mario can reach the Ruin Floor Scrap.

Mario Party 10
Bomps made their Mario Party series debut in Mario Party 10 in the minigame Cliffside Crisis, where they serve as both obstacles and platforms for the players.

Trivia

 * In Super Mario Galaxy, Bomps are two-sided; their model appears on the other side of the wall they are on too. In-game, this is only visible with a few pairs in the Freezeflame Galaxy.
 * In Dreamy Mount Pajamaja in Mario & Luigi: Dream Team, there are stone hands that act similarly to Bomps. The Push-Blocks of Super Mario Odyssey also act like them.