Antichamber is a first-person puzzle game somewhat like Portal except Antichamber is not linear and has a higher focus on exploration. The game's non-Euclidean space/geometry often means conventional logic won't work, and you'll often have to "think outside the box" in order to solve a room (or find a different exit to a room you previously solved). Additionally, part of the fun of Antichamber is just trying to figure out what the goal of the game is.

I enjoyed the game very much and believe it is one of the best games of the year. I would absolutely recommend it to a friend, especially if that friend enjoyed Portal.

PROS:
-The game is fun and each room has a unique puzzle or trick to it.
-Non-linear design means if you get stuck you can try a different direction/room.
-The puzzles struck a good difficultly balance and were difficult but not impossible to figure out on my own.
-The game is completely non-violent and is ideal for casual gamers, children, and those normally turned off by video games due to violence.

CONS:
-The game is single-player only.
-The story is minimal.
-The game has little replayability because the puzzles are set. There is no way to create/share/download new puzzles.