Ubisoft will be running a final open beta for upcoming multiplayer shooter Tom Clancy's Rainbow Six Siege. The beta begins November 25 and will end November 29.

Tom Clancy's Rainbow Six Siege is still on schedule for release on December 1, but that won't stop the online multiplayer shooter from having one last Open Beta. Ubisoft will set loose the masses once more upon the servers, opening up Siege to all PC, Xbox One and PlayStation 4 players between November 25 and November 29. The exact beta start and end times will vary by region.

As a reward for participating in previous beta events, returning players will gain access to the beta one day early. Their Rainbow Six Siege beta will run from November 24 through November 29. And since Ubisoft's experienced enough with betas now to recognize that no one enjoys waiting for a beta to download while the beta is live, pre-loading the beta will begin on November 23.

The goal of the beta is to test matchmaking and online infrastructure, and as such will feature a limited amount of content. That said, Ubisoft will be sharing some content that previous betas did not include. 14 Operators will be playable, 7 Attackers and 7 Defenders, including three Russian Spetsnaz Operators that were not playable previously. The PvP Closed Beta modes, TDM - Secure Area and TDM - Bomb, will both return, but players can pick from both Ranked and Unranked matchmaking modes. And of course a PvE mode will also be available, the Terrorist Hunt - Disarm Bomb mode which was shown during E3 2015.

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Coinciding with the Open Beta announcement is the release of an Idris Alba-starring, live-action trailer. With players growing more familiar with the different playable Operators and their unique abilities, it's quite enjoyable picking them out in the action. Sledge is a personal favorite. Plus, Idris Alba's gravelly voice is a welcomed addition to any work.

There's likely to be a fair number of people questioning why Ubisoft would have an Open Beta so close to Rainbow Six Siege's launch, but there are quite clearly several important reasons for doing so. There's Ubisoft's voiced reason, which is to stress test matchmaking and online infrastructure. Having the unruly masses online and playing a week before launch gives Ubisoft enough time to ensure launch itself goes perfectly smooth, avoiding any of the drama bombs that go along with day one server issues.

In the background is an even better reason for the Open Beta. Having missed the big Black Friday sales surge and entering the market on the heels of titles like Fallout 4, Call of Duty: Black Ops 3, and all of 2015's other major holiday releases, Rainbow Six Siege has work to do in order to pull in players for a December 1 launch. What better way of doing that than unlocking the game for all over the Thanksgiving and Black Friday holiday weekend? Very clever on Ubisoft's part.

Tom Clancy's Rainbow Six Siege will launch on PC, Xbox One, and PlayStation 4 starting December 1, 2015. The Open Beta begins on November 25 (or 24 for Closed Beta participants) and ends on November 30.