Super Robot Spirits – Nintendo64

Super Robot Spirits - Platform: Nintendo64

Play as Devil Gundam:
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Beat story mode with all fighters, then use  Master Gundam 
in 64 mode and defeat Devil Gundam. Devil Gundam will now 
be accessible. 

Play as Master Gundam:
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To play as Master Gundam, beat Master Gundam in story mode 
three times and you will be able to select him in Story Mode.