Tom Clancy's Splinter Cell: Double Agent is the fourth installment in the Splinter Cell series of video games developed and published by Ubisoft. The series, endorsed by American author Tom Clancy, follows the character Sam Fisher, a "Splinter Cell" employed by a black-ops division of the National Security Agency, dubbed Third Echelon. 

Double Agent was released for the Xbox 360 on October 19, 2006. The PlayStation 2, Xbox and Nintendo GameCube versions were released on October 26, 2006. The Windows version was released on November 17 and the Wii version on November 28. A PlayStation 3 version was released on March 27, 2007. 

Originally the game was set for a March 2006 release, but Ubisoft moved the release date to September 2006 in order to have more development time. Ubisoft then released their fiscal quarter results for Q1 2006 and announced that Splinter Cell Double Agent would be put back at least one month in order to boost Q3 2006 income. 

There are actually two separate versions of Double Agent. One version (Version one) was made by Ubisoft Shanghai, who developed Tom Clancy's Splinter Cell: Pandora Tomorrow and was released on the Xbox 360, Windows, and PlayStation 3. The other version (Version two) was made by Ubisoft Montreal (Tom Clancy's Splinter Cell and 
Tom Clancy's Splinter Cell: Chaos Theory) and was released for the Xbox, PlayStation 2, Nintendo GameCube 
and Nintendo Wii. The Xbox 360/PlayStation 3 versions feature a completely custom engine 
while the PS2/Xbox/Wii/Windows versions play more like the classic Splinter Cell games. 
The games share the same general plot but each one features different storylines, plot twists, and levels. Even
 the levels they share have completely different level designs. They do however, share the same background music
 and share a few cut scenes.

System requirement: 

Cpu P4 3.0Ghz or AMD equivalent 
Ram : 1gb 
graphics : supporting shaders 3.0 (GeForce 6 and 7 series, ATI X1300, X1600, X1800, X1900 series) 

ps: if you make you graphics low you can play with 512 ram 128 graphics card