The minigame takes place between the ocean and the skies filled with clouds. The four players are positioned in the ocean. There is a ship above the water, waiting for the players to retrieve Treasure Chests, while in the ocean, there are inhabitants that include a Sushi, a pair of Bloopers, fish, and coral. The minigame then starts.
The players have the opportunity to grab Treasure Chests from the bottom of the ocean and retrieve them to the top to earn Coins within the time limit of 90 seconds. Treasure Chests vary by size, weight, and where they were placed. Small Treasure Chests contain only a single Coin, medium chests contain three Coins, and large chests contain five Coins. To make the minigame harder, there are a pair of Bloopers that move within the water diagonally and a Sushi that swims horizontally. If a player touches one of the enemies, the player will be stunned for a few seconds; additionally, if the player touches them while holding a Treasure Chest, they will be forced to drop the object back to the ground. Players have a limited time staying underwater. If they stay too long, a counter will appear on top of their heads, starting with the number five. If it counts down to zero, they will drown and float back to the surface. There is no winner or loser.
The minigame can be purchased from the Mini-Game House for 250 Coins.
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