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One of the first Dragon Ball video games ever released, Shenron no Nazo follows the first two volumes of the Dragon Ball manga. It's better known outside of Japan for its heavily-localized North American release (as Dragon Power).
Goku and Nora (Bulma) are on a quest to find seven crystal balls. By finding all of these crystal balls, the Dragon Emperor will grant them one wish. It won't be easy though, there are rumors of a mysterious army that is also looking for them.
Dragon Power is a game based on the Dragon Ball anime in japan (though a lot of it is lost in translation). Goku can jump, attack or release a powerful wind wave to stop his enemies. Much of the game is an overhead view, though occasionally Goku will have to fight in a side view. Different power ups will increase his powers and techniques, letting stronger abilities flourish.