During the Microsoft Media Briefing it was revealed that Valve would be bringing its puzzle game Portal to Xbox LIVE Arcade. Entitled “Portal: Still Alive”, the game will feature the full single-player game plus a new challenge mode.

Designed to change the way players approach, manipulate and surmise the possibilities in any given environment, “Portal” has earned more than 70 industry honors for its innovative gameplay, with more than 30 Game of the Year Awards.

Solve physical puzzles and challenges by opening portals to maneuvering objects, and yourself, through space. Look for the game to debut on Xbox LIVE Arcade during 2008.