It guess it goes without saying that Portal 2 was and is absolutely amazing
By now any gamer should have played, or know of, the original Portal. It was made half as a test of the source engine, half as an extra bit to be added into The Orange Box. Somehow, the popularity of this small title exploded, and you're hard pressed to find a gamer that HASN'T played Portal.
Portal 2 does a fantastic job bringing the same charm and originality that the original brought to the table. THe humor is great, the puzzles are challenging, and this return to Aperture Science's labs is more than worth your while.