Design the Ultimate Doritos XBLA GameDelectable chip-maker Doritos announced today that it is partnering with Microsoft to launch the Unlock Xbox contest, which is seeking submissions for Doritos-inspired Xbox Live Arcade games. Ideas can be submitted between now and July 29th, and the five best ideas will be turned into playable builds that can be sampled and voted upon starting on October 29th. The winner will be announced on November 19th, and his or her idea will go into full production, eventually appearing as a free download on the Xbox Live Arcade next summer. "Doritos fans continue to tell us how excited they are to be part of, and personalize, what is important to them," said Ann Mukherjee, VP of marketing at Frito-Lay. "Similar to past Doritos programs that put consumers in control, we hope Unlock Xbox gives people a chance to express their own creativity, this time in the innovative world of gaming." Who are these fanatical tortilla chip lovers that share their thoughts and dreams with Frito-Lay? Anyway, while the winner earns the ultimate glory of having designed a prominent, downloadable advertisement, all five finalists will be given a fantastical prize package, which includes a 42" plasma display, a limited edition Xbox 360 Elite console, 10 Xbox 360 games, a home entertainment system, and much more. Interested parties can click here to register and submit their 500-word proposals.