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DOOM 3 Hints
Notes and Extras
1 of 3: In the Communications Garage at the beginning of the level, you can enter a crawlspace either through the hole in the floor that the cacodemon rises from or through a small hole in the wall near the corner. Exploring this area gets you some more supplies and imps to fight.
2 of 3: Near the elevator on the Communications level, there's a little red computer screen on the wall that says "Open Maintenance Hatch." Click on it to open a wall panel near the door that's just down the hall.
3 of 3: In Comm Engineering Storage 1 (accessible through Comm Engineering Unit 1), kill all the zombies without blowing up the exploding barrels. You'll need to jump onto the barrels and then to a tall crate in order to get up to the room's upper walkway. (You could quickly jump onto a barrel and then onto the crate as soon as you enter the room, then toss a grenade down once you're safely on the walkway to blow up the barrels and zombies together.)
