Bonus Nightcrawler Danger Room level:
Press Up, Up, Down, Down, Left, Right, Left, Right, Start at the Cerebro Files menu.
Bonus Iceman Danger Room level:
Press Right, Right, Left, Left, Down, Up, Down, Up, Start at the Cerebro Files menu.
Bonus Wolverine Danger Room level:
Press Down, Down, Up, Up, Right, Left, Right Left, Start at the Cerebro Files menu.
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X-Men: The Official Game Cheats, Codes & Walkthrough/Guide/FAQ for Gamecube from Cheat Code Central
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X-Men: The Official Game Cheats at CheatingDome.com.