Alternate costumes:
Successfully complete the game to unlock the Army and Battle costumes.
Successfully complete the game a second time to unlock the Ancient costume.
Grenade gun:
Successfully complete the game three times to view all endings. The grenade gun
with unlimited ammunition will be available at the start of the next game.
Operation: Wipe Out mode:
Successfully complete the game without using any continues.
Hint: Design Disc code:
When at the part of the game where this sound is heard after pushing the shelf,
enter "367204" as a code.
