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Doom 64 Version 1.0 - Gameshark Codes
This page here will share minor tidbits, tricks, cheats and hints about Doom 64. As with many of the other guides on my website these are designed to be very google friendly. If you're stuck, and googling to to get done a certain part of the game, that's hopefully how you found this guide!
Invulnerability: 8006330B 0002
Invulnerability & Map Markers: 8006330B 0006
Unlimited Armor: 8006326F 00FF
Rapid Fire: 8106333A 0B94
Map Markers Turned On: 8006330B 0004
Always Have Bio Suite: 80063283 00FF
Always In Berserk Mode: 8006327B 00FF
Always in Invulnerability Mode: 80063277 00FF
Missile Ammo: 800632EF 0064
Have Rocket Launcher: 800632D1 0001
Have Laser Weapon: 800632DD 0001
Have Blue Key: 8006328F 0001
Have Yellow Key: 80063293 0001
Have Red Key: 80063297 0001
Have Blue Skull Key: 8006329B 0001
Have Yellow Skull Key: 8006329F 0001
Have Red Skull Key: 800632A3 0001
Gun & Chain Gun Ammo: 800632E3 00FF
Shotgun Ammo: 800632E7 0064
Plasma/BFG/Laser Weapon Ammo: 800632EB 0064
Always Have Gun: 800632C3 0001
Always Have Shotgun: 800632C7 0001
Always Have Double Shotgun: 800632CB 0001
Always Have Chain Gun: 800632CF 0001
Always Have Missile Launcher: 800632D3 0001
Always Have Chainsaw: 800632BB 0001
Always Have Plasma Rifle: 800632D7 0001
Always Have BFG 9000: 800632DB 0001