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Dreamcast - Dino Crisis cheats

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.