GameBoy/GameBoyColor
X-Men: Mutant Academy

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

unlock Phoenix
On the title screen press:
Down, Right, Down, Up, Left, Right, B + A

unlock Apocalypse
On the title screen press:
Right, Left, Up, Down, Left, Up, B + A

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