Antichamber (tuxdb.com)

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Antichamber is a mind-bending psychological exploration game where nothing can be taken for granted. Discover an Escher-like world where hallways wrap around upon each other, spaces reconfigure themselves, and accomplishing the impossible may just be the only way forward.
Several years in the making, Antichamber received over 25 awards and honors throughout its development, in major competitions including the Independent Games Festival, the PAX10, IndieCade and Make Something Unreal. Antichamber was also supported by the Indie Fund.

Key Features

A deeply psychological experience that will make you question everything you know about how a game works.
Mind-bending challenges that will subvert your expectations at every twist and turn.
An enormous, seamless non-Euclidean world to explore.
Lifelike soundscapes developed by Robin Arnott and an ambient soundtrack composed by Siddhartha Barnhoorn.
A gun that can create, destroy and manipulate matter, allowing you to discover new ways to overcome your surroundings.

The Steam Holiday Sale Day 4!

The Steam Holiday Sale continues today with huge savings throughout the store! Check back often to take advantage of our eight-hour Flash Sales. You can even help select what goes on sale with our Community's Choice Voting Sales.

In addition to Flash and Vote sales, more than a hundred games and apps will be featured as Daily Deals throughout the sale, with new deals popping up every 24 hours.
Today's Daily Deals include:

The Elder Scrolls IV: Oblivion 75% off
Dragon Age: Origins 75% off
The Witcher 2 75% off
Crusader Kings II 75% off
Max Payne 3 75% off
Antichamber 75% off
Tomb Raider 80% off
Rogue Legacy 67% off
Shadow Warrior 75% off

Participating in the 2013 Steam Holiday Sale will also earn customers exclusive Holiday Sale Trading Cards. Collect, trade, and craft 10 Holiday Snow Globe Cards that can only be earned during the sale. Every craft of a Holiday Sale badge will also generate a random item drop from 10 participating Free-To-Play games, featuring exclusive in-game items from Warframe, Path of Exile, Team Fortress 2, DOTA 2 and more. These items are both tradable and marketable.

Learn more about this year's Steam Holiday Sale features HERE.
The Steam Holiday Sale will run until 10AM PST, January 2nd. Complete information on Daily Deals, Flash Sales, Community Choice Voting and more can be found HERE.