Thwomp (ドッスン, Dossun?) is a creature found 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 it falls and crushes him. Variations include Thwimps (small Thwomps) and Thwacks (Thwomps with various facial expressions). In the early games, Thwomp was covered with spikes that could skewer Mario from any direction. When the Mario series moved to 3D in Super Mario 64, the Thwomps underwent an overhaul. They lost their spikes, and became rounded blue blocks, although still hovering in the air and waiting for Mario to come near. This is probably so Mario could use them as platforms. They gained a vocalization: a grunting sound when they fell. The older designs later became the basis design for all subsequent games - it even replaced the blue version of Super Mario 64 in the remake of that game on the Nintendo DS, Super Mario 64 DS.