Press F10 to enter the options menu and then enter the Configuration menu. Type 'SPAM' without the quotes to enable the cheat menu.
Fight as Magneto Activate the cheat menu then, during the game hold ALL 3 kick buttons.
Fight as Juggernaut Activate the cheat menu then, during the game hold ALL 3 punch buttons.
Fight as Akuma Highlight Spiral at the Character Selection screen for 3 seconds and then move to the following characters without stopping - Silver Samurai, Psyloke, Colossus, Iceman, Colossus, Cyclops, Wolverine, Omega Red, Silver Samurai. Wait 3 seconds on Silver Samurai before pressing short kick + fierce punch + roundhouse.
Fight at Space Port Start a 2 Player game with Juggernaut being one of the characters. When Juggernaut defeats his rival the losing player should then press 'Start', once on Juggernaut's face and again on the Space Port as they appear.