Doom 3 BFG Edition (PC)

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Bathroom scare

After you have found the lost scientist and are returning to the main building, find your way back to the bathrooms. Stand in front of the mirror with your pistol then cycle through until your shotgun, then get very close.

Defeating Imps

If the Imp is jumping at you, blast it while it is in the air with the shotgun to kill it in one shot. This is slightly difficult to time. Additionally, as soon as an Imp has thrown a fireball at you, strafe around it with your shotgun equipped. Get very close to the front of the Imp and blast it in the chest. About 95% of the time, the Imp will die.

Defeating Sarge

Be prepared to die a few times. Beware of the edge of the room, as you can fall off. Also, do not hide behind the pillars for too long. They will open up and arc electricity periodically. When you walk into the room, a giant bay door at the opposite end of the room will open, revealing the "new and improved" Sarge. As soon as that door opens a crack, start lobbing rockets in there. After you score about six good hits without being splattered by his BFG, break out the Soul Cube (that you should have charged before entering the room) and let him have it. It should kill him and heal you. Pick up the armor and ammunition around the room before continuing.

Defeating teleporting demons

When a demon teleports in (generally signaled by whisperings, a red tint throughout the screen, and always red lightning in the location where they will appear), you will have a split second before they are able to attack. Take a good weapon (for example, a shotgun or chainsaw for imps and wraiths) and stand close by. For powerful creatures, such as Pinkys, use a ranged weapon and stand at a safe distance; remember to save the game often.

Defeating the Guardian Of The Soul Cube

When fighting the Guardian Of The Soul Cube in hell, do not bother shooting his body. This is a waste of precious ammunition. Instead, blast his "searchers" with something with good coverage like the chaingun, and he will have to spawn more. When he does, a blue light will appear over his body. Shoot it with the rocket launcher. Do this a few times and he will die easily. Also, look in the room around the columns for ammunition, health, etc.

Multiplayer information

During multi-player mode, you can enter the console window to see if anybody tried to join. It will also show you if anybody was rejected due to an invalid password.

Saving ammunition

If you can avoid it, try not to use weapons like the shotgun or others that have difficult to find ammunition on the weaker zombies. The flashlight (if you are fast enough) or just the pistol usually will work.

Various Steam Achievements

Complete the indicated task to unlock the achievement.

AchievementHow to unlock
2 Deaths - 1 GunKill two enemies in the same room with a rocket in DOOM 3 Multiplayer.
All of UsFind the id logo secret room in DOOM 3.
Berserked!Use Berserk to kill a player in DOOM 3 Multiplayer.
Big BoyDefeat Cyberdemon boss in DOOM 3.
BoomtasticBlow up 50 barrels in the DOOM 3, RoE, or Lost Mission campaigns.
Bot BuddyKeep a Sentry Bot alive to its destination in DOOM 3, RoE, or Lost Mission (except Mars City).
Clean SheetComplete a DOOM 3 Multiplayer match without dying.
Cookie StealerDefeat Guardian boss in DOOM 3.
Crushed!Catch an enemy player in the Reactor of Frag Chamber in DOOM 3 Multiplayer.
DOOM II: A Really Big GunFind a BFG in DOOM II single player.
DOOM II: An Important Looking DoorFind a secret area of a DOOM II level in single player.
DOOM II: And Back AgainComplete all levels in 'DOOM II: No Rest for the Living' in single player.
DOOM II: Burning Out of ControlComplete any DOOM II level with 100% kills, items, and secrets in single player.
DOOM II: From Earth to HellComplete all levels in 'DOOM II: Hell on Earth' in single player.
DOOM II: Just Getting StartedComplete any DOOM II level in single player.
DOOM II: Superior FirepowerComplete all 'DOOM II: Hell on Earth' levels on 'Ultra-Violence' or higher in single player.
DOOM: Burning Out of ControlComplete any DOOM level with 100% kills, items, and secrets in single player.
DOOM: Episode 1Complete DOOM Episode 1 on 'Hurt Me Plenty' or higher in single player.
DOOM: Episode 2Complete DOOM Episode 2 on 'Hurt Me Plenty' or higher in single player.
DOOM: Episode 3Complete DOOM Episode 3 on 'Hurt Me Plenty' or higher in single player.
DOOM: Episode 4Complete DOOM Episode 4 on 'Hurt Me Plenty' or higher in single player.
DOOM: NightmareComplete any DOOM level on 'Nightmare' in single player.
DOOM: RampageComplete all DOOM levels on 'Ultra-Violence' or higher in single player.
DOOMed CollectorCollect every PDA in DOOM 3.
DOOMed MarineComplete the DOOM 3 single player campaign on Marine.
DOOMed NightmareComplete the DOOM 3 single player campaign on Nightmare.
DOOMed RecruitComplete the DOOM 3 single player campaign on Recruit.
DOOMed VeteranComplete the DOOM 3 single player campaign on Veteran.
Double the Fun!Kill 2 Imps with one shotgun blast in DOOM 3, RoE, or Lost Mission.
Eat This!Defeat the Maledict boss in RoE.
Evil CollectorCollect every PDA in the RoE campaign.
Evil MarineComplete the RoE campaign on Marine.
Evil NightmareComplete the RoE campaign on Nightmare.
Evil RecruitComplete the RoE campaign on Recruit.
Evil VeteranComplete the RoE campaign on Veteran.
Fists of FuryUse the Artifact with Berserk ability to punch out 20 enemies in RoE.
Gimme Power!Defeat the Berserk Hunter in RoE.
Gimme Time!Defeat the Helltime Hunter in RoE.
Goody FinderOpen all storage lockers in DOOM 3.
I Like to WatchFind all video logs in DOOM 3.
Killing timeScore 25000 on Super Turbo Turkey Puncher 3 in DOOM 3 or RoE.
Lost CollectorCollect every PDA in the Lost Mission campaign.
Lost MarineComplete the Lost Mission campaign on Marine.
Lost NightmareComplete the Lost Mission campaign on Nightmare.
Lost RecruitComplete the Lost Mission campaign on Recruit.
Lost VeteranComplete the Lost Mission campaign on Veteran.
NeophyteComplete any level in Ultimate DOOM in singleplayer.
Ninja KillerKill 5 enemy players while using Invisibility in DOOM 3 Multiplayer.
Not a ScratchComplete a level without taking any damage in DOOM 3, RoE, or Lost Mission (except Mars City).
Play CatchKill 20 enemies with projectiles launched from the Grabber in RoE.
RAGEFind the RAGE logo in the Lost Mission.
Ready for Action!Get the BFG-9000 from Security Chief's office in DOOM 3.
Ripped!Use the chainsaw to kill 20 enemies in DOOM 3.
Shocking!Defeat the Invulnerability Hunter in RoE.
SoulfoodUse the Soul Cube to defeat 20 enemies in DOOM 3.
Speed RunComplete the DOOM 3 single player campaign in 10 hours or less.
Sticky SituationDefeat the Vagary boss in DOOM 3.
Telefragged!Kill an enemy player by jumping into a teleporter after them in DOOM 3 Multiplayer.
That was Close!Kill an enemy with 1 health remaining in DOOM 3, RoE, or Lost Mission.
To Be or Not to BeKill the scientist trapped next to the Reactor Control Room in DOOM 3.
Too Slow, Fool!Kill 5 enemies at once while in Hell Time in RoE.
TurncoatGet 2 demons to fight each other in DOOM 3, RoE, or Lost Mission.
Unarmed BadassKill 20 enemies with the fists/melee hands in DOOM 3.
You Laugh, It WorksFind the bloody handiwork of Betruger (in Delta 4 Hallway) in DOOM 3.
You're Not My Boss!Defeat Sabaoth boss in DOOM 3.