All the characters are in some kind of construction crane boat, floating on a pool of water. The players must keep moving around until their controller (or if a "!" appears over their head if the rumble setting is turned off) rumbles, then they should press A to let down their crane. If the crane pulls up atreasure chest, the player earns one point. If it pulls up a golden treasure chest, it gives them three points. If a Bob-omb is pulled up instead, the player is stunned temporarily. The person with the most points at the end of the minigame wins.
Intro- The players drive up to the center of the arena in their aquatic vehicles. They then face the screen.
Ending- The players line up where they are. The crane on the winner's boat then moves up and down.
In-game text Edit
- Rules – "Find and recover the sunken treasure chests on the seafloor! Your Controller will rumble when you pass over a treasure chest."
- Advice 1 – "Each treasure chest is worth one point. Golden treasure chests are worth three points. Bombs will temporarily stun you."
- Advice 2 – "If the Rumble Feature is turned off, an "!" will appear instead."
- Control Stick – Move
- A Button – Pick up an object underwater