DOOM 64
The password ?TJL BDFW BFGV JVVB will allow you to do various things, such as warp levels, remain invincible and give you full weapons. After entering it, pause the game and go to the features option to select your cheat.
The password W93M 7H2O BCYO PSVB gives you full health, weapons, etc, and puts you on the last level.
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