Half Life 2: Episode One Walkthrough - Urban Flight (Part One)

Half Life 2: Episode One Walkthrough Screenshot 1. Follow Alyx off the elevator to begin Half Life 2: Episode One's lengthiest level, Urban Flight.

Half Life 2: Episode One Walkthrough Screenshot 2. Find this locked gate. Note the orange socket to the right.

Half Life 2: Episode One Walkthrough Screenshot 3. Backtrack past the elevator to this gate. Turn the crank to access the supplies inside.

Half Life 2: Episode One Walkthrough Screenshot 4. Buried beneath the boxes in the far/right corner is the hand crank Alyx is hoping to find.

Half Life 2: Episode One Walkthrough Screenshot 5. Return the crank to the socket and open the gate.

Half Life 2: Episode One Walkthrough Screenshot 6. Ascend the stairs to finally reach the surface. Listen to Dr. Kleiner on the big screen.

Half Life 2: Episode One Walkthrough Screenshot 7. Pull the metal sheeting away from this barricade.

Half Life 2: Episode One Walkthrough Screenshot 8. A supply crate - and surveillance drones - are on the other side.

Half Life 2: Episode One Walkthrough Screenshot 9. Clear another barricade then battle these troops, apparently alerted to your presence by the drones. Be sure to grab an SMG from the troops.

Half Life 2: Episode One Walkthrough Screenshot 10. Slip passed this citadel barrier once it moves out of place.

Half Life 2: Episode One Walkthrough Screenshot 11. Three antlion pits are accompanied by, once again, three cars.

Half Life 2: Episode One Walkthrough Screenshot 12. Plug the antlion pits with the cars (or just run passed them) then follow the road ahead/left to this door. Pull the planks off to enter the building.

Half Life 2: Episode One Walkthrough Screenshot 13. Combine are setting up mines. Toss chairs into the laser beams to trigger the mines and dispatch the soldiers.

Half Life 2: Episode One Walkthrough Screenshot 14. An inferno ensues, fueled by a propane tank in the room to the left.

Half Life 2: Episode One Walkthrough Screenshot 15. Position one of the milk crates so that it supports these pipes. You can then cross the pipes to the ledge and turn off the gas.

Half Life 2: Episode One Walkthrough Screenshot 16. Collect the area's supplies then ascend these stairs.

Half Life 2: Episode One Walkthrough Screenshot 17. More mines are on the second floor. Watch this zombie trip them and blow himself to smithereens.

Half Life 2: Episode One Walkthrough Screenshot 18. More zombies are in the next room. Don't destroy the roller mines you'll find; they'll take out the zombies and will make your advance easier in the upcoming area.

Half Life 2: Episode One Walkthrough Screenshot 19. Grab supplies from the floor then take a peek out the window -- a sniper has taken up position at the end of the road.

Half Life 2: Episode One Walkthrough Screenshot 20. Descend these stairs and encounter another zombie and more roller mines. Take the roller mines to Alyx for reprogramming -- they'll be excellent escorts.

Half Life 2: Episode One Walkthrough Screenshot 21. Duck outside then sprint behind the building on the right where you'll find a pair of supply crates.

Half Life 2: Episode One Walkthrough Screenshot 22. Crouch then seek cover behind this red car. Stand, sprint, then crouch again behind the blue car to advance farther down the road. Note the suit energy in front of the blue car.

Half Life 2: Episode One Walkthrough Screenshot 23. Antlions! If you have your roller mine escorts with you they'll clean up your ant problem nicely.

Half Life 2: Episode One Walkthrough Screenshot 24. Once you are in front of the blue car the sniper won't be able to target you. Toss one of your reprogrammed roller mines into his nest to flush him out - dead. Alternately, use a grenade found in the supply crates ahead to blast him out.

Half Life 2: Episode One Walkthrough Screenshot 25. Alyx will take up position in the sniper's nest and shoot this ladder free. Climb the ladder to advance farther down the street.

Half Life 2: Episode One Walkthrough Screenshot 26. Zobmies attack, but they're no match for Alyx's sniping skills. Enter the building through the door on the right.

Half Life 2: Episode One Walkthrough Screenshot 27. A supply crate - and a toxic head crab - are here on the right.

Half Life 2: Episode One Walkthrough Screenshot 28. Head upstairs then remove the planks covering these windows on the left. Alyx then has a clear shot at the line of zombies marching your way.

Half Life 2: Episode One Walkthrough Screenshot 29. Descend the stairs at the other end of the hall then find this supply crate before returning to the street through the door on the right.

Half Life 2: Episode One Walkthrough Screenshot 30. Remove this metal sheeting so Alyx can snipe the gunman on the other side.

Half Life 2: Episode One Walkthrough Screenshot 31. Push the white car into this antlion burrow.

Half Life 2: Episode One Walkthrough Screenshot 32. Slip behind this barricade once it opens up. Soldiers keep spawning until you do.

Half Life 2: Episode One Walkthrough Screenshot 33. Bust open the supply crates while Alyx catches up. Advance into the building after she deactivates the force field.

Half Life 2: Episode One Walkthrough Screenshot 34. More trouble -- it looks like the core is going critical again.

Half Life 2: Episode One Walkthrough Screenshot 35. Bust open these crates once inside.

Half Life 2: Episode One Walkthrough Screenshot 36. Head left to this battle with several combine troops -- they'll drop the highly-coveted pulse rifle.

Half Life 2: Episode One Walkthrough Screenshot 37. Find plenty of supplies here on the left.

Half Life 2: Episode One Walkthrough Screenshot 38. More soldiers soon attack from the door to the right, where you'll find health and suit energy stations. Both exits here lead to the same hallway.

Half Life 2: Episode One Walkthrough Screenshot 39. Fight passed anther soldier then ascend the stairs to your next auto-save checkpoint and more supplies.

Half Life 2: Episode One Walkthrough Screenshot 40. Toss any unused supplies to the pavement below before dropping through.

Half Life 2: Episode One Walkthrough Screenshot 41. Combine troops are battling an antlion bull outside. It's tempting to hang back until the bull finishes them off, but I found it best to begin work immediately -- just keep out of everyone's way.

Half Life 2: Episode One Walkthrough Screenshot 42. Your first task is to plug up the two antlion pits.

Half Life 2: Episode One Walkthrough Screenshot 43. Here's the second pit. Now at least you won't be bothered by additional antlion spawns. The troops should be history by now.

Half Life 2: Episode One Walkthrough Screenshot 44. As befits the name, "bull," this large antlion attacks by charging head-on. Keep moving to avoid his charges and get in as many shots as you can.

Half Life 2: Episode One Walkthrough Screenshot 45. The machine gun emplacement seen on the right can be a good place to circle around. Unfortunately the bull is too fast to make the machine gun itself much use.

Half Life 2: Episode One Walkthrough Screenshot 46. Before long he'll succumb to your fire, and Alyx will take up position at the machine gun. Rush through the opening in the barricade and find a health station to the right.

Half Life 2: Episode One Walkthrough Screenshot 47. Enter the building through this hole to the left.

Half Life 2: Episode One Walkthrough Screenshot 48. The door on the right is locked. Blow up the barrels in this corner then deactivate the mine before crawling into the vent on the left.

Half Life 2: Episode One Walkthrough Screenshot 49. Keep right at the first junction then climb this ladder.