I had originally thought about posting a Portal 2 video game trailer before the game came out, but it was shown a lot on TV, so I opted to wait until the game was released before talking about it. Naturally, I wondered whether the game would flop or exceed the high standards the first game set. It did the latter, and top video game reviewer IGN.com gave it a 9.5, rated higher than its predecessor.
Essentially, Portal 2 is a first person science fiction puzzle game. You use a portal gun to travel from one place to the next to solve puzzles. There also are new puzzle elements introduced. It's available for the PC, PS3, and Xbox 360.
Here is IGN's review of the game:
Here's a machinima.com video showing the gameplay from Portal 2: