The Rainbow Six Siege Lab Test Server is a test server with a difference. While it does allow you to try out balance changes and updates, such as new Operators, before they go live in the main game, this server gives you more.
Ubisoft is using it to showcase and playtest new, experimental game modes developed for fans and need feedback. This guide explains how to access the Rainbow Six Siege Lab Test Server so you can try out everything Ubisoft has to offer.
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