Portal was an absolutely revolutionary game. The concept was so simple and yet provided such dynamic game play. The player assumes an unidentified test subject who is put through a series of tests by a mysterious voice over the intercom. The promise of a cake at the end of the challenge is the primary motivating force. The Gameplay revolves around the use of a portal gun which can project 2 way portals onto the surfaces of walls. Gravity is conserved when traveling through the portals so the players will must manipulate that to get through the many obstacles. It is a puzzle game in the truest sense of the word. Valve has announced that the Portal experience will be coming to Xbox Live on October 22nd 2008. The new version exclusive to XBL will feature the same original game and 14 new maps exclusive to the Xbox system.