Developer(s)

Valve

Publisher(s)

Electronic Arts, Valve

Genre(s)

Shooter, Platform, Puzzle

Platform(s)

PC (Microsoft Windows), PlayStation 3, Xbox 360, Android, Linux, Mac, Nintendo Switch

Keywords(s)

non-player character, digital rights management, motion blur, professional gaming, female antagonist, achievement attempt detection, wasd movement, robots, death, challenges, a.i. construct, elevators that mask loading times, real-time combat, dark humor, easter egg, original soundtrack release, vent crawling, single-player only, ending change post-release, games advertising games, evolving title screen, voice acting, female protagonist, fully customizable controls, speech synthesis, singing, unreliable narrator, e3 2007, steam achievements, evil organization, human, silent protagonist, game developers choice awards 2008, hidden room, moving platforms, foreshadowing, steam, escaping imprisonment, regenerating health, puzzle platformer, steam play, bloody, steam cloud, linear gameplay, meme origin, achievements, wormhole, explosion, artificial intelligence, ascii, acrobatics, cliffhanger, novint falcon support, teleportation, outside of the map, isolation, hostile a.i., spike video game awards 2007, multi-monitor support, developer commentary, gravity, polygonal 3d, retail games with steam activation, environmental puzzles, interactive achievement awards 2008, portals, camera control, surveillance camera, boss fight, digital distribution, motorsports, xbox controller support for pc, physics manipulation, first-person platforming, jumping puzzle