Eidos Interactive has announced an agreement with Microsoft to release two brand new downloadable chapters in the continuing Tomb Raider adventures of Lara Croft, containing up to six hours of new gameplay and content for Tomb Raider: Underworld. The chapters will be available exclusively on the Xbox LIVE Marketplace for the Xbox 360, as well as a demo for Tomb Raider: Underworld is scheduled to be available on Xbox LIVE Marketplace in October.

Offering entirely new content specifically designed to extend the Tomb Raider: Underworld experience, Tomb Raider: Underworld – Beneath the Ashes and Tomb Raider: Underworld – Lara’s Shadow will deliver two very different single player gameplay experiences.

Tomb Raider: Underworld – Beneath the Ashes takes place after the Underworld story has finished and will feature an incredible new environment to explore, additional secrets to unlock and different enemies to fight. Tomb Raider: Underworld - Lara’s Shadow will introduce players to a new kind of playable character and create a unique Tomb Raider experience.

The first new chapter, Tomb Raider: Underworld – Beneath the Ashes, will be available for download exclusively on Xbox LIVE Marketplace this Christmas. Tomb Raider: Underworld – Lara’s Shadow will follow in early 2009.