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Playstation 2 - Warhammer 40,000: Fire Warrior cheats

Unlock Hard mode:
Finish the game under the normal mode

Level select:
Finish the game once

Unlock Unlimited shield:
Finish all level in the hard mode. 

Infinite ammo:
Finish the game in normal mode with an "A" rank on each level

Unlimited grenades:
Finish the game in hard mode with minimum "B" rank on each level

Infinite health:
Finish the game in hard mode with minimum "C" rank on each level

Selectable left weapon:
Finish the game in hard mode with an "A" rank on each level