Portal 2 (single player mode)

Title: Portal 2
Platforms: Xbox 360, PS3, PC, Mac
Trailer: http://www.youtube.com/watch?v=s79wHKe3DDM
Soundtrack clip: http://www.youtube.com/watch?v=yZYPTK3J3H4&feature=related
ESRB information: E10+ for fantasy violence and mild language

In the sequel to original 2007 blockbuster Portal: Still Alive, Chell finds herself in what appears to be a hotel room, but a male computer voice speaks and it sounds like Chell is still in a testing, but Chell is soon put into suspension and forgotten, Chell awakens to the hotel room looking a hundred years older, because it is. A small robot who travels around on a ceiling rail named Wheatly comes into the room and helps Chell escape.
So playing as Chell you run around a bit with your portal gun trying to escape, solving some minor puzzles, but then Wheatly accidentally powers up GLaDOS, the evil robot running the portal gun tests, she tosses out Wheatly and sends you into hardcore testing.

Portal 2 has the same game play mechanics as the original with slightly different controls. Portal's physics are amazing, the portal gun shoots a blue portal and an orange portal, these two portals connect to each other, you can go through the orange and come out the blue and viseversa. If you shot a blue portal on the wall next to you and then shot the orange portal at the bottom of a long shaft, jump down through the orange one and the force of gravity will shoot you out the blue like a cannon.

There are multiple gels that do various things, there is repulsion gel which is blue and if you jump on it, it bounces you into the air, there is propulsion gel which is orange and increases your speed when you run on a surface covered with it, there is conversion gel which is white and makes a surface able to have a portal shot onto it, and finally something that isn't actually a gel: water. water washes repusion, propulsion, and conversion gel of surfaces.
    Portal 2's artwork is great, the original game's graphics were amazing for 2007 but Portal 2 has some of the best animation and artwork I've seen in games.
    Developer and publisher Valve put the best writing ever put into a game with hularious diologue and an unexpected ending with great cutscene animation.

9 out of 10 for this great game. you can buy Valve products at their site called Steam

Pictures from IGN