The fourth wall is a window, showing the ultimate goal, the exit from the space, which the player must figure out how to get to. A third wall shows a series of cartoonish iconographs and obfuscated hint text that are added as the player finds these on walls of the puzzle space. A second wall provides a map of the game's space that will fill in as the player visits specific rooms, highlighting passages the player has yet to explore, and allows the player, upon return to this room, to jump to any room they've visited before. One is a diegetic menu to set the various game options as well as a countdown timer starting at ninety minutes. The player starts in an antechamber that contains four walls. Regarding typical notions of Euclidean space, Bruce has stated that «breaking down all those expectations and then remaking them is essentially the core mechanic of the game». In Antichamber, the player controls the unnamed protagonist from a first-person perspective as they wander through levels.

The game was released on Steam for Microsoft Windows on January 31, 2013, a version sold with the Humble Indie Bundle 11 in February 2014 added support for Linux and Mac OS X. The game includes elements of psychological exploration through brief messages of advice to help the player figure out solutions to the puzzles as well as adages for real life. Many of the puzzles are based on phenomena that occur within impossible objects created by the game engine, such as passages that lead the player to different locations depending on which way they face, and structures that seem otherwise impossible within normal three-dimensional space.

Antichamber Download Free Full Game is a single-player first-person puzzle-platform video game created by Alexander Bruce.

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