Inside you will find some supply crates and other boxes.
Place it in the mechanism (#91) located near another gate.
Go up through the gate.
Now you’ll be moving outdoors, through the ruined city.
Enemies will appear around, so get rid of them.
This time you will be fighting Antlions too.
At the end of the street you’ll see a blue door (#95).
Grab the planks from there and enter.
Kill the soldiers, destroy the laser traps (#96) and continue on to the next room.
There are a few items laying on the pipes in there (#97).
You have to bring and place some other objects in there to create a counterweight.
Turn the gauge to stop the fire in the nearby room.
Go back to Alyx and use the staircase.
Sniper in one of the windows is more troublesome than him, though.
You have to get near the building he’s in.
Use car wrecks as your coves.
When you’re near the windows, throw a grenade in there or use one of the mines.
Wait for Alyx to go up and take the sniper’s weapon.
Approach the fence and use the small ladder (#101) to get to the other side.
Use the open passage (#102) to the building on the right and continue on.
Approach the wall and wait until soldiers come.
Wait for Alyx and kill the Antlions that attack you.
The girl will initiate the next passage.
Go ahead, killing everyone in your way.
When the door’s blown out, enemies will enter the room.
Kill them all and use the panel on the wall to recharge your energy.
Don’t engage into combat until the enemies weaken the monster.
Start to shoot when the armored vehicle gets destroyed.
Concentrate on using the machine gun - there’s a lot of ammo in the crate near here.
Killing the queen won’t stop the Antlions from coming from the hole on the ground.
As always, grab some cars and use them to fill the holes (#108).
Approach the barricade (#109).
Wait for the gate to open and go inside, killing more soldiers.
Watch out for the ones that stand on the roofs.
Find a hole in the wall (#110) somewhere between the rubble.
give a shot to fire up the door - it turns out it’s locked.
Destroy the barrels, get rid of the mine and use the air vent (#111).
Reach the end of the air vent.
There are two laser traps on both end of the tunnel you’ll get into.
you’ve got the option to’t destroy them, as the explosion would tear you to pieces.
Destroy the air vent in the ceiling (#112) and leave the tunnel.
Enter the elevator and wait for it to fall to the water.
Use the Grav Gun to tear the ceiling and swim up.
You’ll get to another room (#114), which also is secured with laser traps.
Throw a grenade in there and dive.
The explosion won’t harm you this way.
The door’s closed, so use the broken window (#115).
Enter another air vent and go straight ahead.
After a while you’ll find yourself in the elevator shaft.
Jump to the ladder in front of you (#116) and climb up.
Look to the right, and you’ll notice another grate (#117).
Use it to enter another tunnel.
After a short walk you’ll be above the next room.
Use the Gravity Gun to destroy the grate.
It will cause an explosion which will get rid of the barrels and laser traps down there.
Jump down and pop pop the fuse box (#118).
Go further, along with Alyx.
Destroy laser traps and barrels from a safe distance and prepare for the enemy attack.
When you kill everyone that stands in your way, go up the stairs.
Take the crossbow and destroy the supply crates (#119).
Use the Gravity Gun to pull out the plus and go down.
The force field is gone and you’re free to go through.
Use the staircase and head up.
When a rocket strikes the building, find a planked door (#123).
Get through it using the Gravity Gun and head forth.
When the floor crushes under your weight, get rid of all the enemies.
Tear it out and go through.
You’ll meet Alyx.
Go up, avoiding the breakable planks in the floor.
After a short walk you’ll end up in a room where Barney is hiding.
Wait until they finish talking, take a crowbar and use the passage between the buildings.
Use the crowbar to destroy the plank that is blocking your way (#125).
Don’t go down on the street, but turn left and use the staircase.
You’ll see another bridge.
Get to the other side.
You’re in a ruined hospital.
At the end of the corridor there’s a door labeledStorage(#127).
Now you have to be cautious.
There’s a lot of enemies in this building, and a gunboat is floating outside.
Stick close to the windows (#128) on the right side to avoid serious damage.
You’ll have to destroy some laser traps (#129).
The corridor leads to the attic.
You’ll end up fighting a gunboat in here.
It’s best to wait for it to circulate around the building.
The gunboat will shoot bullets that will destroy the floor in here.
If you fall down, you might return to the upper level using the stairs.
When you finally destroy the enemy, it will crush into the building.
Watch out so you don’t get harmed in the process.
Go down and join Alyx (#131).
Wait until the soldiers blow up the door and go further.
Destroy the laser traps and wait for the girl do deactivate the force field ahead.
Go forth, exterminating all the enemies in the hospital (#132).
The floor will collapse under your weight and you’ll fall down to the water filled basement.
Dive and swim ahead - you’ll reach the stairs.
There’s a door nearby (#134) which is closed for the moment.
Kill the Barnacles hanging on the ceiling and jump to the water through the railing.
Swim to the other side of the room.
There’s a supply crate and a pillar, and on it - a switch (#135).
Use it to bring up the door.
As you might have guessed, the water is electrified now, so don’t enter it.
Watch out, as there are also some new Barnacles here.
Hit the switch again and look around the room (#136).
You have to find a blue barrel that’s somewhere around the door.
Hit the switch one more time.
When you enter a small room, kill the spider and leave through the window (#140).
Alyx will join you (#141).
In the next room, jump down and prepare for some serious undead killing (#142).
Use the mines (they’re on the locker) to help you.
Go further, using the only available way.
Stop when you’re in the corridor (#143) which is secured by two machineguns.
Run towards them, hiding behind the pillar.
Now you have to deal with the rest of the enemies.
When they’re all dead, run to the room to the left (#144).
Refill your ammo, grab one of the mines, and prepare to defend against a group of Zombies.
When you succeed, run to the room they run out of.
Get rid of the mines and carefully approach the force field.
You’ll have to pull the plug (#146) with the Grav Gun to deactivate it.
That’s it for the game’s longest episode.
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