X战警：变种人之战

Characters can be changed at any time during the game, which is important as their power level decreases through the game. When the player changes character, those are not being controlled will gradually recover their power level. Also, some areas can only be completed by using the unique abilities of certain characters. An alternate game mode has the player facing all the boss characters from the main game, and if the current character runs out of power, they cannot be used again. The game's bosses include: Sabretooth , Waraxe, Specter, Shadow, Sentinel , Mystique , Magneto , System A, and Apocalypse II.