Description: [Xbox Live Arcade] Portal: Still Alive features the full award-winning Portal single player game from Valve, plus a new challenge mode. Designed to change the way you approach, manipulate, and surmise the possibilities in any given environment, Portal has earned over 70 industry honors for its innovative gameplay, with more than 30 "Game of the Year" awards. Break the laws of physics using "portal" technology to solve puzzles and survive in this darkly comic story weaving adventure with brain-bending puzzles. Experience the first first-person puzzle-action-adventure game with hours of single player gaming. The game includes fourteen brand new bonus puzzles to challenge even the most skilled test subjects. And, get a glimpse into the making of Portal: Still Alive with commentary from the developers. [Valve]