Take one of the bricks and hrow it at the wall with the different texture, opposue the Combine console. Three throws should be enough, the sound will be differnt when you ahve done it properly. If necessary run and throw the bricks.

leave the first room. Do not turn the corner right away. It is a trap. Throw something on the ground by the corner and it will collapse. Jump across. There are two wooden boxes. Push them aside. You’ll see a button on lower side of the wall. The button is the same texture as the wall. Use it and you’ll hear a sound. Wait a moment and part of the wall opposite it (with the Lambda symbol) will open.

Crouch and go through the hole. Turn rightand find two boxes on a wagon. Take the little one and enter the ventilation shaft. Stop before the corner and throw the box into the corner. This is a little difficult. Save the game. Get close to the corner as much as you can. When you are close enough to the area a vertical piston will go down and try to crush you. Probably it will too. Don’t get crushed, just after it starts to lower get back, but as soon as it crushes the box and starts to go up pass it. Do this quickly (PP Note: I never passed this point. I tried bricks, cans boxes everything. None of them worked!)

Get out of the vent, from end of the hall take the little bucket. There is a ventilation grate on the ceiling. Go under it, jump and throw the bucket. It will break into pieces. Push two boxes close and go through the hole. Break the ventilation door at the end with the brick. Go down. See the big box and barrel. Take the barrel away. Push the box and see the hole. Push the box away. Take the barrel, go to hole, at the end put the barrel to the right side. Jump onto the barrel and get out.

Turn right. There is another barrel. Take it away and see the button. Push the button. Elevator door will open. Enter the elevator. Push to the elevator button. You’ll go up. See the windows. Jump through them and watch as shutters block you in. Turn right, go straight. At the end look to your left you’ll see little broken window. There is a fast headcrab inside. Go inside push away the boxes on left, push the button behind them and get out.

Go to right, open the door you just unlocked with the button. There is your suit inside. Wear it. Get out, turn left, at the end of the hall there is trap. Jump over it and go out. (PP Note: there is a window with shutters that shows the Gman. I managed to walk through this window for some reason and go right up to the Gman.)

Turn left and take the crowbar. Break one of the boxes. The floor will collapse. Jump your way across. Take the gun. Open the door. Kill half zombies and zombies. Save your game. Difficult part ahead! Make your way to the hall with window and Combine shield at the end. Don’t walk straight away! Get close to the window. See the bloody part. It will make you a sandwich. (PP Note; In fact if you were watching earlier you would have seen a rebel get crushed there) Don’t let it. Sprint with your suit power. Turn left, don’t hurry. Yes, there is another one. Sprint again. Go to the end. There is a combine soldier! Kill it. Don’t rush in! This part pretty difficult. Save game. There is triple trouble here. Get close to moving wall. It will try to smash you, rapidly get back, when it starts to go back, sprint again and pass two moving walls together, but don’t stop! Turn right and kill two Combine soldiers which are waiting for you.

That’s all. Use the elevator and you are done.