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Half-Life 2: Episode One Hints
They don't seem to be getting through. How can I get those doors open?
1 of 11: You can just walk up to them and use their door handles to open them (though you may have to try several times).
2 of 11: Or you can wait for the zombies to bash them open.
3 of 11: That won't happen until you've more thoroughly explored the area.
4 of 11: After finishing off the zombies in the lounge and raiding it for armor batteries, go check out the two rooms at the end of the hallway.
5 of 11: The one on the left just has a single supply crate in its bathroom, but the one on the right (W54) has a Combine elite in a doorway a ways into the room and to the left, plus another soldier hiding nearby.
6 of 11: Hit the elite with a rocket as soon as you open the door, then stand aside as Alyx shotguns the other soldier.
7 of 11: NOTE: The elite fires an energy orb at you as soon as you open the doors, and you might be able to catch it with the gravity gun and throw it back at him.
8 of 11: After they're dead, go back to the elite's area and look around for a pulse rifle energy orb. (He didn't drop one, but there's one in the nearby supply crate.)
9 of 11: Now if you go back toward the double doors, the zombies will manage to break them down and shamble through.
10 of 11: There's a poison zombie among their number, so hit him with a couple of rockets (or an energy orb) right off.
11 of 11: Then finish off the rest with the shotgun and Alyx's help.