Dino Crisis cheats and cheat codes for Dreamcast

Operation: WipeOut mode:
Finish the game on any difficulty mode less than 5 five hours.

Unlock the Army and Battle costumes.
Finish the game once

Unlock the Ancient costume (caveman):
Finish the game twice

Unlock Grenade gun and all endings:
Finish the game 3 times. Restart the game again to get
the grenade gun with unlimited ammo.

Solve the puzzle:
When at a puzzle, before changing it, around push the button.
It seems, nothing happened, but if you watch the colored lights
they will turn on in the order needed to solve the puzzle.