Tom Clancy's Rainbow Six: Lockdown is the fourth game in the Rainbow Six series. The initial design and PlayStation 2 version were developed by Red Storm Entertainment and the Xbox version was developed by the Ubisoft Montreal studio. Both are published by Ubisoft. The Mobile phone version was released on June 9, 2005; the PlayStation 2 and Xbox versions were released on September 6; the GameCube version was released on September 27; and a version for Windows was released on February 16, 2006.
Tom Clancy's Rainbow Six: Critical Hour is the fifth game in the Rainbow Six series, and was released March 14, 2006. Critical Hour is partially believed to have been made in response to criticism about Lockdown straying too far from the Rainbow Six roots, but even so it generally received very mixed ratings by many gaming sites due to its relatively small amount of content, although it was praised for following the roots of the first games, unlike Lockdown. Following poor sales its planned later release in Europe was canceled, as well as a port of the game for the PlayStation 2.
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