Half Life 2: Episode One Walkthrough - Undue Alarm

Half Life 2: Episode One Walkthrough Screenshot 1. This Half Life 2: Episode One walkthrough is played on normal difficulty on the Xbox 360. Watch the introductory montage to be berated by Dr. Breen, discover that the Vortigaunts rescued Alyx, then see them taunting G-Man.

Half Life 2: Episode One Walkthrough Screenshot 2. After being rescued by Dog, you are brought to a very relieved Alyx. Receive the Gravity Gun from Dog.

Half Life 2: Episode One Walkthrough Screenshot 3. Alyx climbs onto this ledge, displaying an athleticism that apparently you lack. You'll need to solve your first puzzle to get up there and rejoin Alyx and Dog.

Half Life 2: Episode One Walkthrough Screenshot 4. This should be pretty obvious to Half Life 2 veterans -- use the left trigger to grab these boards with the Gravity Gun.

Half Life 2: Episode One Walkthrough Screenshot 5. This metal ramp will then drop down, allowing you to cross to the area above.

Half Life 2: Episode One Walkthrough Screenshot 6. Grab the two medkits on this table then learn from Drs. Vance and Kleiner that you'll need to re-enter the Citadel and shut down the core.

Half Life 2: Episode One Walkthrough Screenshot 7. Crouch to slip beneath the debris that Dog lifts for you.

Half Life 2: Episode One Walkthrough Screenshot 8. Drop off the ledge to begin another of Half Life's infamous jumping puzzles.

Half Life 2: Episode One Walkthrough Screenshot 9. Crouch to slip beneath this debris, then press A to jump across the short gap in the ledge beyond.

Half Life 2: Episode One Walkthrough Screenshot 10. Your Gravity Gun removes this wrecked car blocking the path.

Half Life 2: Episode One Walkthrough Screenshot 11. Next, you need to enter the Citadel through that opening ahead. But how to get across the chasm?

Half Life 2: Episode One Walkthrough Screenshot 12. Dog comes up with an idea. (Apparently he's smart as well as adorable.) He fetches this vehicle which he wants throw into the Citadel - with you and Alyx inside.

Half Life 2: Episode One Walkthrough Screenshot 13. Press X to enter the van on the passenger side then sit back as Dog successfully throws you clear of the chasm and into the Citadel.

Half Life 2: Episode One Walkthrough Screenshot 14. Once across, stay put for another brief thrill ride as the van slips farther into the Citadel. Press X to exit the van once it finally comes to a stop.

Half Life 2: Episode One Walkthrough Screenshot 15. Watch the van tumble over the ledge then continue down the corridor to Alyx's right.

Half Life 2: Episode One Walkthrough Screenshot 16. Jump over this railing to the floor below; Alyx follows.

Half Life 2: Episode One Walkthrough Screenshot 17. Through a short corridor you'll come to this area. Stalkers prevent Alyx from lowering the force field.

Half Life 2: Episode One Walkthrough Screenshot 18. She is, however, able to disable this nearby force field. Note the Roller Mines ahead; Alyx has a plan.

Half Life 2: Episode One Walkthrough Screenshot 19. Crouch to pass through this crawlspace beyond the deactivated force field.

Half Life 2: Episode One Walkthrough Screenshot 20. Drop to this ledge then take a big leap to the indicated lift. You'll take damage but don't worry -- there's a health/suit energy combo station just ahead.

Half Life 2: Episode One Walkthrough Screenshot 21. The lift begins moving up and down. Exit when it's in the down position then heal at this combo station. Approach the red button ahead/left -- pressing the button will release the roller mines in the tube above.

Half Life 2: Episode One Walkthrough Screenshot 22. Use your Gravity Gun to deflect all the mines but one.

Half Life 2: Episode One Walkthrough Screenshot 23. Return to the lift, carrying one of the roller mines.

Half Life 2: Episode One Walkthrough Screenshot 24. Ride the lift back up to Alyx. Hold the mine still while she reprograms it.

Half Life 2: Episode One Walkthrough Screenshot 25. Drop the mine; it will slip behind the force field and kill the two Stalkers, allowing Alyx to disable the force field.

Half Life 2: Episode One Walkthrough Screenshot 26. Pass through the previously-inaccessible room then continue to this ledge where you'll see several soldiers meet a firey end. Continue left and crouch under some debris.

Half Life 2: Episode One Walkthrough Screenshot 27. Ascend the stairs and cross a bridge before using your Gravity Gun to clear the path of this debris.

Half Life 2: Episode One Walkthrough Screenshot 28. Up a short flight of stairs is this railing. Hop over to the ledge below.

Half Life 2: Episode One Walkthrough Screenshot 29. Follow the ledge to this energy bridge. Soldiers try to cross but are swept away by a vortex.

Half Life 2: Episode One Walkthrough Screenshot 30. To cross the bridge safely, wait for the vortex to subside then sprint across by pressing the left bumper as you run.

Half Life 2: Episode One Walkthrough Screenshot 31. Alyx crosses the bridge after you. Is that the look of love or what?

Half Life 2: Episode One Walkthrough Screenshot 32. Follow the corridor then hop over another railing to this room with a glass floor.

Half Life 2: Episode One Walkthrough Screenshot 33. Watch as the console switches from a recording of Dr. Breen to an image of an even creepier insect. The giant bug slides underneath the floor then emerges upright across the room.

Half Life 2: Episode One Walkthrough Screenshot 34. The bug vanishes in a pulsating flash. Follow Alyx to the nearby exit and she'll deactivate the force field.

Half Life 2: Episode One Walkthrough Screenshot 35. Traverse the corridor a short distance then become temporarily trapped in this room. Your Gravity Gun is stripped from you, then is supercharged into a more powerful version, able to pick up heavier objects and even living persons.

Half Life 2: Episode One Walkthrough Screenshot 36. Follow along to this half-charged energy bridge. Note that the half that is charged coincides with a lighted socket, lower/right. The unlit socket lower/left can be charged by tossing one of these energy balls into it, thus activating the bridge.

Half Life 2: Episode One Walkthrough Screenshot 37. Cross the bridge and be met by soldiers -- time to show them that newly-supercharged Gravity Gun. Grabbing them with the left trigger is preferred at distance, while a close-up solider is easily dispatched with a jolt from your right-trigger fire.

Half Life 2: Episode One Walkthrough Screenshot 38. Next up is this completely-unpowered bridge. Shoot energy balls into both sockets to activate the bridge, then cross to battle more soldiers and Overwatch.

Half Life 2: Episode One Walkthrough Screenshot 39. This next bridge is a bit tricky; you'll need to bank an energy ball off the wall to get it past the clear shield blocking the left socket.

Half Life 2: Episode One Walkthrough Screenshot 40. Cross the bridge then duck under this debris. Battle Overwatch on the other side.

Half Life 2: Episode One Walkthrough Screenshot 41. Follow the corridor to this ledge and hop over the gap to continue.

Half Life 2: Episode One Walkthrough Screenshot 42. Witness these styders as you cross the glass bridge. A gunship follows, then crashes.

Half Life 2: Episode One Walkthrough Screenshot 43. Follow the ledge to this door then pass through after Alyx opens it.

Half Life 2: Episode One Walkthrough Screenshot 44. The corridor leads to this combo station. Grab an energy ball from the beam off-screen to the left.

Half Life 2: Episode One Walkthrough Screenshot 45. Walk to the end of the ledge and throw the energy ball into this socket. The lift descends.

Half Life 2: Episode One Walkthrough Screenshot 46. Look up. Debris falls periodically. You can either step aside, grab it with your Gravity Gun's left trigger, or shoot it with the right trigger.

Half Life 2: Episode One Walkthrough Screenshot 47. The lift stops. Use your Gravity Gun to pull the pink console off the wall. You can then shoot an energy ball through the opening; it will bounce off the wall and into the socket if you aim just right.

Half Life 2: Episode One Walkthrough Screenshot 48. The lift resumes and so does the debris, including this large piece of something. I found it best to grab it with the Gravity Gun's left trigger, then toss it aside.

Half Life 2: Episode One Walkthrough Screenshot 49. Activating this socket only works briefly as a Stalker reverses the lift. Take him out with a well-placed energy ball then re-energize the socket to send the lift on its way for good.

Half Life 2: Episode One Walkthrough Screenshot 50. Quickly exit the lift once it arrives to avoid this final chunk of debris.

Half Life 2: Episode One Walkthrough Screenshot 51. Fill up on health and energy at this combo station then continue ahead to load the next level.