Spiked stone

Anvils are weapons similar to Thwomps occasionally appearing as hazards in various games.

The Anvil first appears in Super Mario Land 2: 6 Golden Coins. Near the end of Wario's Castle, Anvils fall and raise from the ceiling.

Anvils appear again in the final pages in Yoshi's Story, where they are carried by the Black Shy Guys inside Bowser's Castle. If a Yoshi walks near the anvil-carrying Shy Guys, they will drop the giant, spiked anvil and crush whatever is beneath it. They appear in the levels Lift Castle, Ghost Castle and Mecha Castle.

Anvils reappear in Mario & Luigi: Superstar Saga, but not as a weapon, and they only appear in Hoohoo Village and the Beanbean Kingdom.