As far as I know, there is only one DBGT GBZ game: Dragonball GT Transformation. But its sequel is about to come out I think(DBGT Transformation 2). Click here for the walkthrough for Transformation 1.
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Codes
Health and Energy codes
Enter these codes at anytime during gameplay.
Code
Effect
Down, Up, Right. Right, Right, Left, Right, Left. [...]
