Half-Life is a first-person shooter video game developed by Valve and released in 1998. The player assumes the role of Gordon Freeman, a scientist who has to escape a research facility after it is invaded by aliens. The gameplay consists primarily of combat, puzzle-solving, and exploration.

Half-Life is comprised of 18 inter-connected levels separated by loading screens. Here is a list of all the areas the player has to go through in order:

1. Black Mesa Inbound
2. Anomalous Materials
3. Unforeseen Consequences
4. Office Complex
5. We’ve Got Hostiles!
6. Blast Pit
7. Power Up
8. On A Rail
9. Apprehension
10. Residue Processing
11. Questionable Ethics
12. Surface Tension
13. Forget About Freeman
14. Lambda Core
15. Xen
16. Gonarch’s Lair
17. Interloper
18. Nihilanth

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