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Portal is a text-driven adventure with a graphical interface published for the Amiga in 1986 by Activision. The writing is by American author Rob Swigart, and it was produced by Brad Fregger. Ports to the Commodore 64, Apple II, and IBM PC were later released. A version for the Atari ST was announced and developed, but not published.

Portal is a series of first-person puzzle-platform video games developed by Valve.Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2 (2011), center on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility.

Portal 2 is a first-person perspective puzzle game. The player takes the role of Chell in the single-player campaign, as one of two robots—Atlas and P-Body—in the cooperative campaign, or as a simplistic humanoid icon in community-developed puzzles. These three characters can explore and interact with the environment.

A game is a structured form of play, usually undertaken for entertainment or fun, and sometimes used as an educational tool. Games are different from work, which is usually carried out for remuneration, and from art, which is more often an expression of aesthetic or ideological elements.