Half-Life Walkthrough

After taking care of the doggies, you can either jump over the fence and lose some health in the process, or shoot the big electrode to open the door.

In the next room will be a new type of alien behind some thin glass. If you get too close, or press the big button, he'll get out. You can stick around to take care of him but there aren't any rewards for doing so.

You'll come into some sort of laboratory with two cells, which hold some goodies. Try going into the control booth and pressing the button -- it's a great way to get rid of the headcrabs, and also works on soldiers if you can lure them in.

Wander through the complex, watching soldier vs. alien fights and taking out the winner, until you get to a series of hallways with false ceilings. There are four laser beams that you have to turn on in this area (as well as a wonderfully macabre sequence before getting the gauss gun).

Once you've turned on all four laser, try test-firing the super-laser. Then try pushing a box so it obstructs the blast shield and fire again. Don't you just love science?

Jump down the newly created hole, but try going down via pipes and boxes so you don't lose too much health.

You probably should stop the weird operating machine before leading out the scientists, but you'll need one to activate the retinal scanner in order to go out the front door. There are some sentry guns hanging around outside so be careful. (Reward the scientists by giving them an up close and personal look at the electro-machine in the room near the beginning of the section. Whee!)