From the Super Mario Wiki
The Oho Ocean is the large sea to the east of the Beanbean Kingdom. The Oho Oasis is an island in this ocean. Mario and Luigi had to dive to the bottom of the Oho Ocean (the Oho Ocean Seabed) during their adventure in Mario & Luigi: Superstar Saga.
Many balloons filled with Coins dot the surface of the ocean. By jumping, the Mario Bros. can pop these, and get the Coins inside, ranging anywhere from two to ten Coins per balloon. Additionally, two whirlpools lead to Chuckle Bean-filled areas, as well as a small island where the heroes can receive a 1-Up Mushroom.
There is a game which Mario and Luigi can play. The player can find the game in the south-eastern region of the ocean. There will be a green Oho Jee who will explain the rules and ask if they want to play. The game begins next to the island, with Mario surfing on Luigi. The object is to pop twenty three Oho Balloons as fast as possible. The prizes for the game are awarded for the clearing time. The prizes are Chuckle Beans, Woo Beans, and Hoo Beans. If the player completes the task within 38 seconds, they are awarded the Casual Coral clothing. After that, if the score is 38 or below, the player wins two Chuckle beans, two Hoo beans, and two Woo Beans.
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