Thwomp (Mario & Luigi: Superstar Saga)

Thwomp is a character who first appeared in Mario & Luigi: Superstar Saga.

History
He lives in a new home of the Hammerhead Bros. from the Hoohoo Mountain to Beanbean Kingdom outskirts, the Gray Rocks and Black Rocks can be destroyed which the Mario and  Luigi's hammers will be upgraded. It reveals himself in a featureless room.

He explains if they want to play the game, they should charge themselves 200 coins to destroy the three stones that he summons on. It has a chance of containing 200 coins, 300 coins, 1 Secret Scroll (teaches Swing Bros.)/2 Secret Scroll (teaches Cyclone Bros.) or nothing.