X-Men: Children Of The Atom (PC)
Press [F10] to enter the options menu, then enter the configuration menu. Type spam to enable cheat mode.
Take more damage
Type god at the message screen. The phrase "God mode enabled" will appear. Exit the message screen. The phrase "Sinister has changed the cheat code" will appear at the top left portion of the screen. In this mode, fighters will receive greater damage.
Fight as Juggernaut or Magneto
Enable cheat mode. Enter the system menu and enable
the "Boss Select" option. Save the modified settings.
Start normal game and select a fighter and block mode. Hold all
three punch buttons down (to fight as Juggernaut) or all three
kick buttons (to fight as Magneto) just before the match begins
to load. Release the buttons after the match finishes loaded.
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Fight as Akuma
Highlight Spiral, wait three seconds, press [Left], wait one second, press [Left], wait one second, press [Left], wait one second, then highlight Iceman. Then, press [Right], wait one second, press [Up], wait one second, press [Left], wait one second, press [Left], wait one second. Omega Red should be highlighted. Press [Down], wait three seconds, then press [LK] + [HP] + [HK]. Akuma fall onto the screen to confirm correct code entry.
Enable cheat mode. Enable the "Free Play" option at the system menu.
Fight in Juggernaut's stage
Start a new game with two players, with one of the
players using Juggernaut. Allow the player controlling Juggernaut
to defeat the other player. Have the losing player press [Start].
Press [Start] on Juggernaut's face when it appears, then
have the losing player quickly press [Start] when the "Space
Port" stage appears.
Enable cheat mode and begin game play with any character.
Hold all three punch buttons to fight as Juggernaut or all three
kick buttons to fight as Magneto. Note: You cannot switch back
to the original character.
Strategy guides from GameFAQs