Chapter 6. Blast Pit [Black Mesa]
Break the boards with a crowbar and you'll find yourself in the maintenance storage room. Go forward and grab an armor battery on the second floor. Enter the control cabin and press the green button. In the room behind you'll find a first aid kit, a crowbar, and grenades, along with a zombie guarding them. Kill the crocodile monster below with a double shotgun blast. Head down. On the other side of the elevated area, you can climb into the ventilation shaft, grab some grenades and a first aid kit, and then head down the stairs a dozen floors. You can also take the elevator down.
Railroad Tunnel
On the ground floor, enter the security post and grab some ammo. Board the electric train (press "E") and travel forward along the rails (select your speed by pressing "up" or "down"). Along the way, you'll see an overturned moving platform with boxes. You can find shotgun shells in the boxes.
At the end of the path, you need to jump off the platform to avoid being thrown off by the impact. We reach a gap filled with acid. We go around the acid along the path on the right, climb up, and jump into a large yellow pipe. We'll go through it into the next room.
Here, we'll destroy two crocodile monsters with the shotgun. Grab a couple of first aid kits and a couple of batteries. We'll proceed into another large room. Stand on the pipe hanging above the acid. From there, we'll move to another pipe, then to a container and into the elevator. We'll ascend to the upper floors.
6.2. Central Room
We'll fight off a whole pack of big-eyed electric dogs.
In the dead end on the right, we'll grab a couple of first aid kits and some ammo. We'll cross the bridge into the central room. We reach the cabin, where a huge tentacle will drag the scientist through the broken glass. (If we're carrying the hat, leave it in the room; we'll come back here.) We quickly run through the opposite door. We continue on, grabbing the explosives.
Boss: Three Tentacles
We see three huge tentacles emerging from the ground in the large room. They constantly pound the floors of the room, preventing us from moving forward. We need to get below. To defeat this boss, we need to supply this central building with fuel, oxygen, and power. Let's go in search of these resources.
Take the explosive, throw it (left mouse button) into the hole under the tentacles, and then detonate it (right mouse button). This will silence the tentacles for a while and send them flying downwards. Run down the stairs. On the second staircase, stop at a mid-level position; they won't be able to reach us here. Throw another explosive under the tentacles, and meanwhile, jump down to the floor below (not the very bottom, but the second from the bottom), use a crowbar to break through the boarded-up door, and quickly enter. We continue down the corridor.
6.3. Fuel and Oxygen Connection
We pass through the airlock and follow the red and blue pipes. We reach two deep pits and descend into the left one. There's a hidden ladder on the left wall. We fall into the water below, kill the crocodile monster, continue on, and climb back up.
We'll find ourselves in a huge shaft with a fan at the bottom. On the right, you can go into the airlock and get some shotgun shells there. We enter the shaft and descend the ladders below the large fan. Press the button to start it. Then, quickly climb up between the spinning blades and then jump onto the fan above. The air current launches us high into the air. Here, we lean against the wall and crawl into one of the ventilation shafts (there are many, but only one is high enough for us).
We crawl to the next room. Here, we find the red valve in the upper room, place it on the pipe below, and then turn both valves. We go through the open doors nearby. Now we go back along the blue and red pipes to the central room.
In the room with three huge claws, we descend to the very bottom floor. You can go down through the gap in the corridor without entering the central room. We pass the airlock.
6.4. Connecting the Power Supply
On the way, we break open a crate to find machine gun ammo. We kill the big-eyed dogs sleeping ahead with a grenade. We break open all the wooden crates to find shotgun shells, first aid kits, and batteries. We approach the cliff with the acid, press the green button on the wall, and wait for the elevator to arrive.
We take the elevator down halfway, then quickly climb to the ladder on the wall before the elevator falls. We go down to the end. We talk to the scientist and enter the large tank with the acid. We go up the stairs, enter both cabins, and press the green buttons. When the electromagnet drops down and starts rotating the rotor, you can return back to the central room to the boss.
Tentacle Destruction
In the boss room, carefully and quickly climb to the very top, avoiding the claws. We need to get to the room from which the tentacle pulled the scientist. Enter this room; if all resources are already connected, you can press the green button. After pressing it, the central chamber will fill with fire, and all three claws will burn alive.
Enter the central room and descend the stairs into the abyss in the middle of the room.
6.5. Acid Channel
Down on the shore, grab a revolver with ammo. Dive into the water, swim away from the center, and emerge in another room.
You'll see a seething stream of green acid with spinning blades in the center. Descend the stairs to restore health at the stationary first aid kit and the HEV charger. Climb up, walk along the pipe, jump onto the pipe below, then onto the grated floor above another pipe.
Walk along the grate to the left, jumping from pipe to pipe a couple of times. Turn the valve all the way to the end, then climb into the large pipe and continue along it .
Source: gamesisart.ru.