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Half-Life 2 Hints
Rooftop Combat Tips
1 of 6: You could just stand on the rooftop and help Grigori shoot fast zombies as they appear.
2 of 6: Watch for ones to climb up nearby drain pipes -- that's a good time to shoot them with the .357 Magnum.
3 of 6: Another way is to retreat back through the door and into the room at the top of the stairs as soon as you get your shotgun, then wait near the open doorway for any fast zombies who get past Father Grigori to appear one at a time.
4 of 6: If you have Dog's ball, drop it on the floor and let it distract the fast zombies while you carefully pick your shots.
5 of 6: If you used the gravity gun to carry a heavy item like a radiator grille up the stairs, you could smash fast zombies with it after the attack begins. The best place for this would be inside the room at the top of the stairs so that your heavy item doesn't go flying off somewhere out of reach.
6 of 6: If those tips aren't good enough for you, there are a couple of advanced strategies you could try.