Access Level 29: Outpost Omega Without Passwords
This level can be accessed through the Holding Area. Near the end of the level, you will see 4 switches. Flick them in the following order: 3, 1, 2 and 4. The circular platforms ahead should now line up. Now go through the small door and get into the teleporter.
Now you will appear in line with the 4 circular platforms. Run across them and go into the red room. Kill the Nightmare Imp and exit the stage. This is a Secret Exit which will have you go straight to Outpost Omega. Be warned that you will only have the guns that you exited the Holding Area with.
Access Level 30: The Lair Without Passwords
This level can be accessed through the Altar Of Pain level. To get there, after grabbing the Yellow Key, simply jump to the platform with the Soulsphere on it. Now do not jump off this platform. Look at the map and you will notice that the platform you are standing on looks like an arrow. Turn in the direction that the arrow is facing. Now run into the wall exactly where the arrow is pointing. You will go straight through the wall.
Now be careful as a Baron Of Hell roams this area. Kill it and exit the stage. You will now be sent to The Lair level.
Access Level 31: In The Void Without Passwords
This level can be accessed through the Spawned Fear level. To get there, after going through the Yellow Door and walking up the steps, you will hear a door open. Quickly run back through the Yellow Door and turn left and then turn left again and enter the room there (the one where you faced 3 Hell Knights). You will see a small area with a teleporter exit in it. Run for it before it disappears and that is it.
You will now be taken straight to Level 31 In The Void. If you fail to make it to the teleporter, just repeat the steps above, there is no need to restart the level.
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
Cyberdemon Survival
There are simple methods to defeating the Cyberdemon. Yes it is very strong but its missiles are actually quite slow. When it launches missiles, unless you are near a wall, where the impact of the missile is still felt, you can simply dodge the missiles with simple right to left movements. This is probably the easiest in the Watch Your Step and No Way Out levels. Soon you will be confident enough to take on Cyberdemons with nothing but a Pistol!
Doom Artefact 3
In the In The Void level, get right to the very end and slowly walk over to the edge of the platform (the platform whereby if you jump off the edge the stage ends) and when the screen shakes, go to where you turned on the Blue Key Switch. The pillar that had the Doom Artefact will now have a switch on it. Use the switch and run all the way back to the Red Key door (quickly) and run towards the wooden bridge.
The artefact will be at the end of the bridge. Grab the artefact and then up the top should read: ‘It must do something’. Now you can exit the stage.
If the artefact disappears before you can snare it, just repeat the entire method, right from the start.
Playground Advice
When you are on the Playground Level, the key to dodging the bullets from Arachnitrons, is simply to not stop moving. Simply keep running and you will not be hit. As for the Cyberdemon that emerges after you defeat the Arachnitrons, simply keep your distance from it and fire at it. When it returns fire, simply run behind one of the four large pillars and you should be safe. As for the Mancubis’ that com afterwards, they will be easy to kill. Pick them off one at a time. By the time that only two remain, you will be fine.
It is, however, important to try to not grab the Partial Invisibility items as they make enemy fire unpredictable and hence, harder to dodge. After defeating the Arachnitrons, you should grab every box of Rockets and wait until you become visible again before you grab the Megasphere.
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.
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