Go to the character selection screen. Highlight Spiral and wait three seconds. Then, highlight the following characters in order: Silver Samurai, Psylocke, Colossus, Iceman, Colossus, Cyclops, Wolverine, and Omega Red. Finally, highlight Silver Samurai, wait three seconds and press LK + HK + HP. If you entered the code correctly, Akuma will appear in place of Silver Samurai. For player two, highlight Storm and wait three seconds. Then, highlight Cyclops, Colossus, Iceman, Sentinel, Omega Red, Wolverine, Psylocke, and Silver Samurai. Then, highlight Spiral, wait three seconds, and press LK + HK + HP.