From the Super Mario Wiki, the Mario encyclopedia
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Grindels are enemies that debut in Super Mario 64. They appear as mummified Thwomps, with a pair of small round eyes and a grin on their faces (hence the name). They only appear inside of the Pyramid in the level Shifting Sand Land. They attack in the same way as a Thwomp, floating up in the air vertically and falling over the ground, squashing anybody below them. Grindels can also move horizontally by "jumping" back and forth.
Grindels also appear in Mario Party 2, in the minigame Lava Tile Isle. Here, seven Grindels form a platform over a pool of lava. Before they change positions, they will slowly shake. When they do move, they leave gaps between them (characters do not remain on Grindels when they move), and characters may fall into the lava.
A similar creature is the Spindel, which is basically a cylindrical obstacle with the same appearance as the Grindel.
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