Strange but addicting dungeon crawling game similar to the first Legend of Zelda title. Each floor is randomly generated each time you play so there's always something different to do, and with the DLC there are many additional items and enemies to encounter. Not only is the game challenging by itself, but you are only given one life to complete every floor otherwise you must start over again. This isn't frustrating, though, considering it's always different every playthrough. The biblical theme is pretty cool and unique too.

An amazing sequel to the already classic Portal, this game improved on the first in many ways I think. Valve did a great job elaborating on the story not only forward but also revealing the origin of many of the characters and Aperture Science itself. Online co-op, free DLC, and the challenge mode will probably keep you busy as well.

Probably the best cooperative survival game you will find. Just turn on the commentary to see how much thought went into keeping the game balanced and replayable, with things like the director and multiple game modes it is sure to keep you busy for a while. I haven't really had any bad experiences with this game and it is well worth paying full price for, especially if you like cooperative gameplay and killing zombies.