[1] There are five bosses in order of appearance: Boomerang, Sabretooth, Juggernaut, The White Queen, and Magneto.

Wolverine, Nightcrawler, and Colossus fight through melee combat while Cyclops, Storm, and Iceman shoot projectiles.

After the boss is defeated, the heroes have to quickly fight their way back to the beginning of the level before a bomb goes off.

There are five missions: "Practice", "Future City Street Fight", "Search And Destroy The Robot Factory", "Subterranean Confrontation" and "Battle Through A Living Starship".

This is because the creators originally meant for parts of the text displayed at the end of each level to provide the player with the missing part of the code, as well as instruct him/her to combine the revealed information with the label on the cartridge to discover the full code.