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In the overworld, Cork and Cask taught the Mario brothers this technique. Mario can slam his hammer onto Luigi's head to dunk him underground. From there Luigi can go underneath metal fences. When pressing , Luigi will pop out of the ground again. This technique is used to dig up types of beans. The technique is used in the battle with the Chopper Bros. attack.
- A similar move called Mole Mario can be performed in Mario & Luigi: Dream Team, but this time, Luigi buries Mario.