Unlock Ranking Mode:
When you have inserted your coins hold Punch + Kick + Escape + Guard and press 'Start' and your overall rank will appear when the game has been completed.
Unlock Alternate Costumes:
At the 'character' select screen highlight a fighter and hold 'Start' and press Punch, Kick, Escape or Guard.
Change Winning Pose:
When you have won a match hold Punch, Kick, Escape or Guard to choose one of four different winning poses.