To unlock Iceman's Danger Room enter Right, Right, Left, Left, Down, Up, Down, Up, Start.

At the Cerebro Files Menu screen enter Down, Down, Up, Up, Right, Left, Right, Left and then press Start to activate.

Unlock Danger Room Missions:
There is a total of 8 Danger Room missions to unlock. The first three are unlocked during game play but to unlock the other six you have to collect ALL the Sentinel files and Weapon X files for each character.


Achievements
Complete the following tasks to get the corresponding gamerscore.

Xavier Institute Iceman - Gamersocre 0:
Complete Iceman's training mission

Xavier Institute Nightcrawler - Gamerscore 0:
Complete Nightcrawler's training mission

Xavier Institute Wolverine - Gamerscore 0:
Complete Wolverine's training mission

Danger Room Iceman - Gamerscore 20:
Complete Act 1 of the game

Danger Room Nightcrawler - Gamerscore 20:
Complete Act 2 of the game

Danger Room Wolverine - Gamerscore 30:
Complete Act 3 of the game

X-Men - Gamerscore 50:
Accumulate 950 achievement score

Champion Iceman - Gamerscore 70:
Collect ALL Sentinel Tech as Iceman

Champion Nightcrawler - Gamerscore 70:
Collect ALL Sentinel Tech as Nightcrawler

Secret Identity Iceman - Gamerscore 70:
Collect ALL Weapon X Files as Iceman

Secret Identity Nightcrawler - Gamerscore 80:
Collect ALL Weapon X Files as Nightcrawler

Champion Wolverine - Gamerscore 110:
Collect all Sentinel Tech as Wolverine

Secret Identity Wolverine - Gamerscore 110:
Collect ALL Weapon X Files as Wolverine

Evolution Wolverine - Gamerscore 120:
Wolverine has been upgraded with ALL available mutations

Evolution Nightcrawle - Gamersore 125:
Nightcrawler has been upgraded with ALL available mutations

Evolution Iceman - Gamerscore 125:
Iceman has been upgraded with ALL available mutations