Thwomps are recurring enemies in the Legend of Zelda series. They are giant, spiky stone blocks that appear only in the two-dimensional sections of their respective games. These invincible enemies attack Link by dropping from the ceiling. Thwomps originated as enemies in the Super Mario Bros. series.
Thwomps appear in 2-D passageways and Link can stand atop them in order to get up to a higher platform. If Link runs underneath them, they will attempt to crush him.
Once again, Thwomps appear only in the two dimensional sections of the game. They still attack Link by attempting to crush him as he runs underneath them.