Tom Clancy's Rainbow Six Siege: Operation Grim Sky is an addition to the multiplayer tactical shooter with a first-person view. The expansion includes two new operatives: Maverick and Clash. Each of them has its own advantages, which are successfully used in real combat. In addition, the update improves balance and other details of the game. A reworked map of Hereford Base from Tom Clancy's novel also appeared.
The add-on requires the original version of Tom Clancy's Rainbow Six: Siege.