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The Technical Test Server (TTS) is an alternative version of the Tom Clancy's Rainbow Six Siege video game available to all players who own the game. The feature allows players to test new gameplay features that may be added in future patches on servers separate from the base game they are played on.

When joining the TTS, a copy of the player's account is made specifically for the test server. Progression in the TTS is separate from the full game.

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