Contra Rebirth
Play as Plissken (lizard):
Successfully complete the game on the Normal difficulty to unlock Plissken
(lizard).
Play as Tsugu-Min (robot):
Successfully complete the game on the Easy difficulty to unlock Tsugu-Min
(robot).
Nightmare mode:
Successfully complete the game on the Hard difficulty to unlock Nightmare
difficulty. In Nightmare mode, any enemy that is destroyed will shoot a blue
ring in your direction.