Dunk Hammer

Luigi Dunk is a Bros. move in Mario & Luigi: Superstar Saga. It is taught by Cork and Cask in Chateau de Chucklehuck along with Mini-Mario. When Mario whacks Luigi from behind with his Hammer, Luigi will be buried into the ground, unless the two are above metallic plating. While in this state Luigi can move underground, allowing him to pass under obstacles and jump into barrels from beneath. If Luigi passes through an obstacle in which Mario cannot follow, he will be separated. Mole Luigi can also be used to find Beans hidden in underground spots marked with an X. Once Luigi has emerged from the ground, he cannot go underground again without Mario's help.

In Mario & Luigi: Dream Team, a nearly identical move called Mole Mario appears.