Crystal Dynamics has confirmed that upcoming downloadable title Lara Croft and the Guardian of Light will be exclusive to the Xbox 360 for at least four weeks. The reason why it’s exclusive is because the game is part of Microsoft’s Summer of Arcade promotion. One of the bizarre requirements of being a part of the promotion is that the game can’t be on another platform for at least four weeks.

As soon as the exclusivity period finishes, the game will crop up on Steam for the PC and PSN for PS3.