Xbox game Tom Clancys Rainbow Six Critical Hour is a first-person shooter video game developed by Ubisoft Montreal and published by Microsoft Game Studios. It is a reboot of the Ubisoft series Rainbow Six, and is set in the fictional city of Dubai in 2009. The game is an action-adventure game, and is a reboot of the Ubisoft series Rainbow Six. Critical Hour is set in the fictional city of Dubai in 2009. The game is an action-adventure game, and is a reboot of the Ubisoft series Rainbow Six. The game is a co-operative multiplayer game, in which players can play as one or more teams of five players. The game is set in a variety of environments, including a skyscraper, a desert, and a city street. The game is a follow-up to the 2009 game Rainbow Six: Ghost Protocol. The game was announced at E3 2009, and was released on October 26, 2009. The game was well-received by critics, who praised its graphics and co-operative multiplayer. The game was a commercial success, and was certified platinum by the Xbox 360 video game certification body.