Part 52

From the HEV station in section c3a2b, grab the assault rifle and run to the opposite wall with a window. Crouch to avoid the first teleporting vort, then face the door. Shoot the second vort that appears near the door.

Wait for the first vort to be killed by electrical discharges. Collect the gauss gun ammo and use the HEV station. Use the exit portal to return to the starting teleporter area.

Proceed through portals 2, 4, and 7 to reach the C Reactor Core in section c3a2f.

In the C Reactor Core, stay on the starting ledge. Observe the rotating platforms and the large circular ring that moves up and down. Avoid getting crushed by the ring against the ceiling beams.

Quicksave. Jump to the circular ring as it descends to its lowest position.

Run left along the ring until you find a ledge with a button labeled "01". Wait for the ring to rise to the ledge's level, then jump to it (using a moving platform if necessary).

Press the "01" button. Quicksave.

Repeat the process: jump to the ring as it descends, run left, and find the ledge with the "02" button. Jump to the ledge and press the button. The central core doors will open.

Quicksave. Jump back to the ring, then to one of the moving platforms leading to the central core.

When a platform is next to an open core door, move onto the door's ledge, crouch-jump through the door, and enter the portal to return to section c3a2c.

In section c3a2c, save your game. Do not use the nearby exit portal. Instead, go through doors to section c3a2d.

In section c3a2d, find the red wheel on the overhead pipe and use it (you may need to jump while pressing 'Use item'). Wait for steam to kill three headcrabs, then turn off the steam to retrieve an armor battery from a dark area.

Locate the side alcove with a ladder. Climb it and proceed down the corridor to a closed door. A scientist will open it.

Enter the opened area and collect supplies. Pick up the long jump module.

To use the long jump module, run forward, crouch, and jump immediately.

When the scientist opens the next door, have him and the security guard follow you through the noisy scanner. Use the first aid and HEV stations if needed, then enter the large teleporter chamber.

Leave the scientist and guard near the chamber door. Save your game.

Alien controllers will begin teleporting in. You must distract them to prevent them from killing the scientist, which results in a game over.

Option 1 (Ledge Method): Climb a red ladder to a high ledge. Run around the chamber to attract controllers. This method offers little room to dodge and can result in significant damage.

Option 2 (Floor Method): Stand on the floor opposite the scientist, near the narrow ledge to the teleporter core. This makes you less visible but most controllers should still target you. Watch for controllers teleporting near the high ledge and shoot them to get their attention. Avoid using gauss or gluon guns.

When the scientist tells you to get into position, quicksave. Run to the spot on the floor opposite the scientist.

Continue distracting controllers and dodging their attacks until the scientist indicates it's time to go.

Immediately run along the narrow ledge to the portal and jump into it to be teleported to Xen.