The Peace Keepers

Hidden fighters:
Hold L + R + A at the Jaleco logo screen. Release the buttons when the "Press Start" text is displayed. Nortin and Orbot will be available on the character selection screen.

Fight as same character:
Highlight the "1P Game" option at the title screen and hold L + R + Down on controllers one and two. The "2P Game" option should automatically become highlighted. Press Start on controller one. Both players may now select the same character for game play.

Desperation move:
When fighting as Flynn with very low life, face right, hold R, and press Down, Down/Right, Right, X. Flynn will turn red and gain extra power.

Quit battle mode:
Press Select when the scoreboard appears.
Information in this section was contributed by Jesse Smith.

Hint: Super moves at any time:
When playing as Flynn, Echo, or Prokop, grab an opponent from the front. Sweep the D-pad in a ½-Circle towards the direction your character is facing and press the Attack button to execute the super attack. For Norton or Al, execute the same motion when you grabbing your opponent from behind.
Information in this section was contributed by Fats Derby.

Hint: Al: Cannon Blast:
Press X + A, B when he begins his spinning move.

Hint: Al or Orbot: Projectile attack:
When playing as Al or Orbot, hold X for approximately three or four seconds, then release.
Information in this section was contributed by Choazin.

Hint: Echo: Flaming Cannonball:
Press B(2), sweep the D-pad from Down to Forward, then press Y. She will dive down in a ball of fire.