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Half-Life 2: Episode One Hints
Zombie Tripping Tips
1 of 5: When you near the top of the stairs and can see a supply crate and some tripmines, pull the supply crate in with the gravity gun and then fire it at the tripmines.
2 of 5: If you miss with the crate, or don't want to risk losing track its contents in the explosion, use the pistol to blow the tripmines instead. (Or go up the stairs far enough to get the nearby zombie to wake up and walk into the tripmines.)
3 of 5: As for the remaining zombies, hold back while they stagger up and a rollermine starts attacking them.
4 of 5: You can let the rollermine kill the zombies while you hang back, or you can suck it in with the gravity gun and hold it out to Alyx for reprogramming.
5 of 5: You might as well do that as soon as possible, since you want to make sure the rollermine doesn't start attacking you at any point.
