Doom 64 Nintendo 64 Cheats

Super Password
Enter W93M 7H2O BCYO PSVB. This code will give you 100 health, 200 armour, all weapons, full ammo and a backpack. It'll also supply you with the three pentagram icons that make your laser three times stronger than the BFG and can kill bosses in four seconds flat. These useful pentagrams also let you use the three mysterious switches in the last level, closing the gates which spawn the monsters.

Watch me die difficulty
Level 3 - BXLG 4GSH 46YJ L2?0
Level 4 - CXBF CG5P 1G5G HOTL
Level 5 - BX8L 5BNL W1D5 W3KR
Level 6 - BYS9 SBG? 78TS N2KL
Level 7 - BCYJ HG1B 7BFZ ?SKL
Level 8 - CX3F CG3P 1LDF HHSW
Level 9 - FFMX MGPH ZVNX WDJC
Level 10 - DVY8 YGDR PBYF 10JC
Level 12 - M18C 2L5Z YS74 CGQB
Level 13 - 4JDN RGGN G8VN T7LB
Level 14 - 3ZH? KB5X SH2P WMVB
Level 15 - 3GJL KBR9 BT36 7YLB
Level 16 - TXLT GGD5 9PR7 68JL
Level 17 - TDXH KBNJ 5Q6F W2JC
Level 18 - JY1D CQ53 ZNW? OXZC
Level 19 - SD8G TBXR 30CZ ?X5C
Level 20 - L5ZH 4HYQ 6VGW KZKF
Level 21 - CCCM TQ9F D7S9 R28L
Level 22 - GVM7 WVQ7 MBSS M7QC
Level 23 - GGRS P3Q7 QOC6 89QB
Level 24 - Y1ZL VBGY CL11 FWBB
Level 28 - WO4R 6HRZ P9R9 ZSLB

All passwords from all levels
The Terraformer - CB92 NBPL SYL? JO27
Main Engineering - BXYH ?G41 6Z4J PJ?Z
Holding Area - CYCC MGPK X47G TS2B
Tech Center - CF3? PG6D S12Z PFKB
Alpha Quadrant - BXRO TH1F 52GG 7W?B
Research Lab - BBXW HLGS XB8F 4RKB
Final Outpost - FVV9 FL55 QGFV DWJB
Even Simpler - FFLB MQ6C VV1C PF1B

Very cool DOOM cheat
In Doom 64, enter this password ?TJL-BDFW-BFGV-JVVB. At any time during a level, pause it and there will be a new option called FEATURES. IT will give things like invincibility, all weapons, etc. In the first feature choose the level you want and press a C button to go to it.