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You are Gordon Freeman, a theoretical physicist at the Black Mesa Research Facility.
When a routine experiment goes horribly wrong, you must fight your way through an interdimensional alien invasion, and a bloodthirsty military clean-up crew in order to save the science team... and the world!

Nineteen chapters of fighting through top-secret labs, running atop harsh desert landscapes, sneaking into abandoned railways, and leaping across dimensions
Mind-Blowing graphics and effects, never before seen on the Source Engine
Face off against an army of classic enemies, updated with new features and engaging AI
Wield an arsenal of military hardware, scientific prototypes, and the iconic crowbar through incredibly detailed environments
The all-new soundtrack and voice acting create a more immersive experience than ever before