In Waterworld, you play from an overhead/isometric perspective controlling the Mariner's boat on the ocean. The point of the game is to destroy the Smokers' boats and dive for sunken artifacts, at which point the game switches to a side on perspective so that the player can directly control the Mariner underwater.
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contrary to popular belief this 5 star rating is not because of the life changing music, but because of the fact that the company "Ocean" made it.
I don't recall enjoying the gameplay for this, but Dean Evans put together a banger of an OST for this game.