Half-Life (Black Mesa) Walkthrough
1. Incoming Transport - Play as a young 27-year-old scientist.
2. Anomalous Materials - Main Hall of the Scientific Complex.
3. Unforeseen Consequences - After a Serious Accident During the Portal Opening.
4. Office Complex - Exit Through the Doors, Then Have to Climb Through the Window.
5. We Have Guests! - Shoot the Blue Laser from afar.
6. Firing Range - Fight Off a Whole Pack of Big-Eyed Electric Dogs.
7. Power Supply - Power the Railroad and Get Out of Here.
8. On the Rails - Ambush on the Elevator. Stop in Front of the Round Elevator.
9. Detention - Ride the Electric Train and Be Attacked by Three Soldiers.
10. Waste Processing - Take the Magnum from the Dead Guard on the Surface.
11. Questionable Ethics - go up to the room with broken animal cages.
12. Surface Tension - shoot at the explosive barrels to kill the soldiers easier.
13. Forget Freeman! - destroy the tank with a rocket launcher or grenades.
14. Lambda Core - after some time, the portal in the center will open.
Xen (2020):
15. Xen - the teleporter took us to an alien world.
16. Gonarch's Lair - the monster spits acid, tries to ram us.
17. Intruder - appear in front of the alien factory.
18. Nihilanth - find yourself in a large hall with a huge boss hovering in the center.
19. Finale - teleport to a monorail car flying through space.