Unlockables
Unlock Nightcrawler's Danger Room:
At the Cerebro files enter Up, Down, Up, Down, Left, Right, Left.
Unlock Danger Rooms:
There are a total of 8 Danger Room missions. The first 3 are unlocked during game play and the the other 6 danger room missions you have to collect ALL the Sentinel Files and Weapon X Files with each character.
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