Tomb Raider: Underworld, also known as Tomb Raider 8, is an action-adventure video game developed by Crystal Dynamics, Buzz Monkey Software, and Santa Cruz Games and was published by Eidos Interactive. Crystal Dynamics developed the PlayStation 3, Xbox 360, and PC versions and was released in November 2008. Santa Cruz Games developed the Nintendo DS version and was also released in November. The Wii and PlayStation 2 version was developed by Buzz Monkey Software, although the PS2 version saw a January 2009 release in North America and March 2009 in Europe. Eidos released two new chapters of Tomb Raider: Underworld as exclusive downloadable content on the Xbox Live Marketplace - Beneath the Ashes and Lara's Shadow which was released in February and March 2009 respectively.
It is the eighth game in the Tomb Raider series and resumes the adventure where Tomb Raider: Legend left off and addresses elements of the plot left unexplained in Legend and Tomb Raider: Anniversary. It is the third game in the series to be developed by Crystal Dynamics and is also the first game to be released on the PlayStation 3.
Source: Wikipedia, "http://en.wikipedia.org/wiki/Tomb_Raider:_Underworld," available under the CC-BY-SA License.