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.