Chapter 14. Lambda Core [Black Mesa]
14.1. Container Warehouse
Reach the cargo elevator, press the lever in the control room, press the button on the elevator itself, and go down.
On the ground floor, deal with the crocodile monsters. Proceed to the spacious warehouse, where assassins will attack. It's best to wait for them in the narrow corridors and kill them with a shotgun. Climb the spiral staircase to the top floor of the warehouse.
Take the left path on the 2nd floor, make your way through the container, enter the door with the green light, and go down the elevator.
14.2. Scientists' Hideout
Kill the Vortigaunts and large monsters that appear. Once we clear the hall, the scientist upstairs will open the door for us.
The scientists ask us to start the reactor to create a new portal to fix the situation. In the next room, another scientist will give us a new weapon—a gluon gun. We test it out, grab some ammo and first aid kits. Continue down the hallway to the left, enter the elevator through the glass doors, and go down.
We kill the small monsters. We move along the corridor, and behind a large red-and-white device we find a battery, an underbarrel grenade, and crossbow arrows.
14.3. Coolant System 01
We enter the large room, climb the stairs to the third floor, and take the elevator down one floor. We continue along the corridor, turn into the room on the left, and climb over the barricades. On the second floor, we descend into the hatch, press the lever there, and continue through the opened doors.
We find ourselves in a large but empty reservoir. We descend the stairs to the bottom of the reservoir. At the bottom, press the green button on the wall. We return to the elevator and return to the top. On one of the walls, near the control panels, we find and press the switch. Water will begin to fill the reservoir. We can return to the central room.
14.4. Coolant System 02
We pass through the rubble. We approach the reservoir and jump into the water. We find a button underwater, press it, and stand on a small moving platform; the platform lifts us higher. We enter the door and go along the corridor.
We find ourselves in an empty reservoir. Press the button on the wall. We take the elevator up. Activate the lever near the control panel, which will cause the reservoir to begin filling with water. Return to the central room above.
14.5. Aux. Tank Reactor Access
Maintenance Station. We go into the room and meet a guard. Here you can recover from the first aid kit and charger on the wall, as well as pick up plenty of ammo.
We enter the central reservoir of the cooling system through the left corridor. Many Vortigaunts and large monsters will appear here; deal with them all. In the tower on the central yellow bridge, you can get a first aid kit and a battery. We jump into the water and swim through the side underwater tunnel in the center.
14.6. Core
We'll reach the Lambda Complex's core. We'll climb higher and higher up the stairs, fighting off the emerging Vortigaunts.
On the 5th floor, press the lever, which will activate the central installation and emit powerful red lasers. We'll continue climbing, dodging the lasers; they always hit the same spot. After climbing three more floors, we'll jump through the broken door into the corridor.
14.7. Teleporter Core
After exiting the central shaft, we'll climb the stairs and enter the guard's room. Restore your health using the first aid kit and charger, and collect some ammo. Continue down the corridor.
In the corridor, turn left at the dead end. G-Man is behind the glass here, entering a small portal.
Continue down the corridor to the right. You can go through the door on the left to practice using portals. You can only enter the yellow portals, after which we instantly find ourselves where the green portal is. Further down the corridor, you can go down the elevator to see a diagram of the Lambda complex core, and see it in person through the glass. We return to the top and enter the last door.
Here, the space has begun to distort and many small portals have opened. We need to climb to the very top of the core using the teleporters.
1. Approach the yellow teleporter on the stairs and look through the window. When a moving platform passes under the green portal, enter the yellow portal.
2. From the platform, jump into gate 02 (do not enter the portal yet).
3. Look up; when a platform passes under the green portal above, enter the yellow portal. After teleporting, quickly sit down to avoid hitting the pipe.
4. Jump into gate 04 (do not enter the portal yet).
5. Look up in the right corner. When a platform passes under the green portal above, enter the yellow portal in the center.
6. From the platform, jump into gate 07.
7. You'll find yourself in a separate room. Here, jump onto the middle ring, which rises and descends. From the ring, jump across the platforms to door 01, press the button, then to door 02, press another button on them. After this, a path to the portal will open in the center; jump across and teleport.
14.8. Teleportation Room
We'll find ourselves in a room on the top floor. Proceed down the corridor and take the elevator up. We visit the scientists, listen to them, restore health, collect a full arsenal of weapons, and take the rocket pack (Long Jump Module). We proceed through the white chamber that opens.
We enter a room with a large teleportation device. One of the scientists will activate it, and we need to fend off the flying monsters that appear. It's best to use the gluon cannon or revolver.
After a while, the portal in the center will open, and a bridge will extend towards it. Run along the bridge, jump, and teleport to the alien world— Xen.
Source: gamesisart.ru.