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The Orange Box: Half-Life 2: Episode Two Hints
Zombie Combat Tips
1 of 9: The easiest and most ammo-conservative way to handle this is to bash the board that's on your side of the door, then let the vortigaunt zap the zombies through the fencing.
2 of 9: To open the door, you'll have to get rid of all the boards that are on its other side.
3 of 9: The way to do that is to grab onto each board with the gravity gun and then drop or throw it. (Or hit each board with a Primary Fire burst.)
4 of 9: After you go in, look over to the right to find an armor battery inside a locker. (If you open the locker doors, you'll find a red gas can.)
5 of 9: On the opposite side of the cage room from the locker is a doorway into another room.
6 of 9: Just past that doorway are two "sleeping" fast zombies.
7 of 9: Grab one of the two nearby red canisters with the gravity gun and throw it so that it'll explode right next to those zombies.
8 of 9: After the vort zaps any survivors, look for one more fast zombie on the ground next to the back wall of the second room.
9 of 9: Throw the other red canister at him, then let the vort finish the job if necessary.