Antichamber is a first-person puzzle-platform game created by Australian developer Alexander "Demruth" Bruce. 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. 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. The game was released on Steam for Microsoft Windows on January 31, 2013. A version originally sold with the Humble Indie Bundle 11 in 2014 added support for Linux and OS X. Gameplay and plot In Antichamber, the player controls the unnamed protagonist from a first-person perspective as they wander through levels. 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". The player starts in an antechamber that contains four walls. One is a diegetic menu to set the various game options as well as a countdown timer starting at ninety minutes. 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. 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. 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. Puzzle elements in various chambers involve manoeuvring themselves around the spaces, where level elements can change after passing certain points, or even based on which direction the player is facing when traversing the level. Laser beams are used as mechanisms to control various doors; these may either require the beams to be blocked or unblocked, and many doors require multiple beams to be in their proper state to open. Initially, the player can trigger these themself. Later, the player gains access to a series of colored "guns", each which helps the player access more of the space. Initially, the gun can pick up any number of small