Portal (video game)

Portal is a first-person puzzle game where the player, Chell, uses the portal gun to create two linked portals on flat surfaces. Objects and the player can pass through these portals, enabling momentum-based puzzles. The game introduces mechanics such as portal placement, momentum conservation, and the use of cubes to activate switches. The puzzles escalate in complexity, culminating in timed challenges and environmental hazards.

The game's physics engine, based on Source, allows for realistic object interaction. The portal gun can only place portals on certain surfaces, adding a layer of strategic thinking. The game also features a commentary mode where developers explain design decisions.

Portal is set in the Aperture Science Enrichment Center, a research facility run by the artificial intelligence GLaDOS. The player, Chell, awakens in a relaxation vault and is guided through test chambers under the pretense of testing the portal device. As the game progresses, GLaDOS's passive-aggressive behavior becomes more sinister, and Chell discovers the facility's dark history, including the fate of previous test subjects.

The narrative is delivered through environmental storytelling, audio logs, and GLaDOS's dialogue. The game's climax involves Chell escaping the facility and confronting GLaDOS, leading to a final confrontation. The story is notable for its dark humor and satirical take on corporate science.

Portal was developed by Valve, with a small team led by Kim Swift, who conceived the idea as a student project called Narbacular Drop. Valve hired the team and integrated the portal mechanic into the Source engine. The game was designed to be a short but polished experience, with a focus on innovation over length.

It was released on October 10, 2007, as part of The Orange Box, which also included Half-Life 2 and Team Fortress 2. A standalone version followed in 2008. The game received critical acclaim for its originality and has since been ported to various platforms, including macOS, Linux, and mobile devices.

Portal received universal acclaim, with critics praising its puzzle design, writing, and voice acting. It won numerous awards, including Game of the Year from several publications. The game's iconic song, Still Alive, performed by Ellen McLain (GLaDOS), became a cultural phenomenon.

Portal has had a lasting impact on game design, inspiring countless imitations and influencing puzzle games. It spawned a sequel, Portal 2 (2011), and a spin-off, Portal Stories: Mel. The game is often cited in discussions of narrative in games and is preserved in the Library of Congress's video game collection.

Portal contains several hidden details and easter eggs. The game's protagonist, Chell, is of unknown origin, and her name is never mentioned in-game. The development team included a 'rat man' character, Doug Rattmann, whose graffiti appears throughout the facility, hinting at a backstory. The game's ending song, Still Alive, was written by Jonathan Coulton, who was initially unaware of the game's plot.

Portal's speedrunning community has discovered numerous glitches and exploits, such as 'portal bumping' and 'flinging', which allow for record-breaking completion times. The game's source code was later released, leading to fan-made mods and community content. Additionally, the game's physics engine has been used in educational settings to teach concepts like momentum and spatial reasoning.

GLaDOS

Genetic Lifeform and Disk Operating System, the AI antagonist.

Chell

The silent protagonist of Portal.

Aperture Science

The fictional research company that created the portal gun and GLaDOS.

Portal gun

The device that creates linked portals.

The Orange Box

The compilation package that included Portal.