Thwomp is a creature found in many video games from the Super Mario Bros. series, usually found guarding castles. It first appeared in Super Mario Bros. 3, and has been included in almost every Mario game since.

Thwomp is a large, heavy stone block with an angry-looking face. It hovers in the air, waiting for someone to get too close, and then THWOMP!; it falls and crushes him. Although Thwomp is invulnerable to most attacks, it is destroyed on contact with an invincible character. In Super Mario Bros. 3, they can also be destroyed by hammers. Tanooki Mario can even turn the tables on them by luring them into dropping and then jumping onto them, turning himself into a statue before landing.

Thwomps are almost always blue, or more rarely, grey. In the early games, Thwomp was covered with spikes that could skewer Mario from any direction. Since 1996, the spikes have vanished, and Mario can jump on top of it.

Big Brother

Thwomp's big brother Whomp is a mario character that crushes by jump toppling onto Mario. Whomp was first introduced in Super Mario 64, then he was used as a blockade in party mazes in Mario Party games.

In Super Mario World, there was a smaller version of Thwomp, about the size of a standard block, that hopped back and forth, called Thwimp.