Here is how it works: When you join a game, look at the Gamertags. If you see the Gamertag XboxLive, simply play one complete game session. If you beat the mystery gamer, you’ll win an official limited-edition Xbox Live T-shirt. If you lose, the mystery gamer has to move on to other games; everyone gets one shot.
The mystery gamer has access to Major Nelson’s complete library of Xbox Live-enabled games, so he or she could be playing anything! Stay tuned for exact days and times and keep your eyes peeled.
The first appearence of this mystery gamer was on July 9. The mystery person was playing “Rallisport Challenge 2” and “Project Gotham 2.” The next debut of the mystery gamer will be today on “MechAssault and Rallisport Challenge 2.” The time will be between 4-6pm.