(Note: This cheat requires two Neo-Geo Pocket Color systems and a Neo-Geo link cable.)
Collect all 300 cards in SNK vs. Capcom card battle mode. Then link card battle mode to another NGPC in millennium battle mode. Finding all 300 cards, millennium battle mode unlocks all hidden fighters and awards 5,000 vs. points.
Beat the game 3 times with any Capcom character to unlock Akuma.
Faster character selection
Successfully complete game on Gamer difficulty.
Press Option when the "SNK vs. Capcom" title appears. An animation selection screen will appear, allowing you to see each character's ending sequence.
Special Dance Olympic game
Press Option at the stage selection screen in dance mode. The round will begin with rodent symbols instead of the normal symbols.