Here are some cheats and tips for the game Monster Force.
In-game reset:
Press Start to pause game play, then hold L + R + A.
Invincibility:
Press Start to pause game play, then hold L + R + B and press Down. A sound will
confirm correct code entry. Note: Enter this code again to disable its effect.
Play as Drew or Mina:
Hold L + R + B + Right at the character selection screen.
Complete level quickly:
Hold Right + R + L + A during game play. Alternately, hold Up + R + L + A.