Here’s an interesting new way to cross promote. Apparently there’s been a scavenger hunt injected into Rainbow Six: Vegas 2 since July 18th that urges players to seek out clues in the campaign regarding Paramount Picture’s upcoming comedy Tropic Thunder, starring Jack Black, Robert Downey Jr., and Ben Stiller. Players who reach the end of the scavenger hunt will receive an invitation to join Ubisoft’s VIP Club, a chance to download a free VIP map, and will be entered into a prize drawing for an Xbox 360 Elite system, complete with a one-year Live subscription and a collection of Ubisoft games.

“This is a new and highly innovative use of dynamic in-game advertising and really demonstrates the creativity and marketing power of this medium,” said Cory Van Arsdale, CEO of Massive.

He took the words right out of my mouth. Hit the jump for details on the hunt, which runs through August 25th.