A groundbreaking first-person shooter that blends physics-driven gameplay, environmental storytelling, and cinematic pacing as Gordon Freeman battles the Combine in a dystopian City 17.
- Developer: Valve
- Release year: 2004 (Source engine)
- Genre: First-person shooter
- Core mechanics: Gravity Gun physics puzzles, scripted sequences, vehicle segments
- Reception: Critical acclaim; multiple Game of the Year awards and enduring influence on narrative FPS design