Here are some cheats and tips for the game Super Robot Spirits.
Play as Devil Gundam:
Beat story mode with all fighters, then use Master Gundam in 64 mode
and defeat Devil Gundam. Devil Gundam will now be accessible.
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Play as Master Gundam:
To play as Master Gundam, beat Master Gundam in story mode three times
and you will be able to select him in Story Mode.