Fatal Fury: First Contact

Play as Alfred: Get to the 8th stage without continuing or losing a round and finish an opponent with a S. power five times. When you get to the 8th stage Alfred will challenge you. After you beat him you will be able to select him.

The King of Fighters R-1

Play as the bosses: Complete the game with four full teams, one edited team with Shingo, and one edited team with Leona on any difficulty level. You'll receive one boss character for each time you finish the game for a total of six bosses.

Level select: Complete the game once, then go to the 'settings' screen. You will now be able to choose a starting level.

Play Kyo from KOF '94: To play a classic version of Kyo Kusanagi, select Kyo using the Option button.

Easy special moves: First get over 97 wins on your record. Use the Option button to select Extra or Advance mode. Special moves will now be much easier to perform, and can be done with simple movements of the control stick.

The King of Fighters R-2

Easy special moves: Use the Option button to select Extra or Advance mode. Special moves will now be much easier to perform, and can be done with simple movements of the control stick.

Metal Slug: First Mission

Play a girl: Finish the game and then the next time you play you will be able to select the girl as your character.

Stage select: Finish the game and the S-continue option will become available.

Pocket Tennis Color

Play an amoeba: In tournament mode, beat the 3 opponents in your first tournament. After that you will be able to select the amoeba for your character.

Samurai Shodown

Play as Shiki: At the character select, hilight the Random Select option and press up, up, down, down, up, down, down. Shiki will appear above the Random Select.

Play as Zankuro: At the character select, hilight Random Select and press down, down, up, up, down, up, up. Zankuro will appear below the the Random Select.

Samurai Shodown 2

Play as Yoka: First move to Kuroko, then hold B and rotate the control counter-clockwise for 3 or 4 circles. Yoka will appear on the space where Kuroko normally is. Keep holding B and select it by pressing A.