When Portal was originally released as part of The Orange Box in October of last year, its uniquely puzzling gameplay and dark, sharp-witted humor thrilled consumers and critics alike. Set in a mysterious scientific facility, Portal introduced players to new ways of moving through the gameworld that challenged their perspective and flexed their spatial awareness. The pitch-perfect voice-over soon became stuff of Internet legend, and the song that played during the end credits was so popular that it has since been released as a downloadable track for Rock Band. The only real complaint that surfaced was that the game ended too quickly. Recently released as a stand-alone retail product, Portal remains a unique gem of a game that packs a huge amount of appeal into a small package.