HALF-LIFE 2 TIPS & TRICKS
Follow Freeman Item room
You will hear the metal device where you get two people to follow you. After it is done, you will see a room to go through. You can find items there, but be careful; sometimes you may die. Save the game before entering it.
Getting past turrets and other dangerous enemies
When you need to run a long way in front of you and you have some objects with you (for example, a non-explosive barrel), if you have the gravity gun, pick it up. Use it as cover and run (while facing the enemy) to the other side. Then if possible, shoot the barrel at the enemy. REMEMBER: Make sure there are no more that one enemy while doing this. Also make sure that the object is indestructible, and most importantly, look at the enemy and see if you can kill him or it with one shot.
Punting objects
Pick up an item in the game without using the Gravity Gun. Drop it until it leaves the bottom part of the screen. Then, pick it back up and throw it as fast as possible. If done correctly, it will appear as if you are kicking the object. This is especially fun to do with the toy doll at the beginning of the game. REMEMBER: This works best with lighter objects.
Flip jeep
When you get the jeep, use turbo towards a wall. Press Y to get out before you hit the wall. If done correctly, when the jeep flips you will also flip. REMEMBER: You may get hurt as well.
Re-activating turrets
To re-activate a turret, crouch and face the way the legs are sticking out from the turret. Pick it up with your gravity gun or use key, and face up while you have the turret and it will re-activate. When there are no enemies around, carefully press Y (or L if you have gravity gun) until the turret stands up straight and is activated. REMEMBER: This is important if you are using turrets to kill the CPs coming from the blue openings. Never re-activate enemy turrets that you disable.