While Tomb Raider: Underworld will hit PC, PlayStation 3, Xbox 360 and other consoles November 18, the two downloadable episodes are not a timed exclusive and will only appear on Xbox 360, an Eidos representative clarified to MTV Multiplayer. Furthermore, there are no plans to release additional content on other platforms.
Said to add six hours to the game, the chapters will arrive in two chunks. The first, Beneath the Ashes, is set after the game's conclusion and will hit by Christmas. The second, Lara's Shadow, should be released in early 2009.
That exclusivity apparently extends to the action-adventure game's impending demo as well, as Eidos stated that the PlayStation 3 will not receive the downlodable demo set to arrive in the Xbox Live Marketplace later this month.