Video walkthroughs for Mario Party from SuperCheats
Demonstrating the game Treasure Divers. I'm Luigi, all the other players are set to hard difficulty. I did end up winning this game though, it's the type of game where everyone can get a certain amount of coins I got 9 I believe.
Game Rules: Dive into the sea and bring up Treasure Chests from the bottom. Press A [A button] to dive.