The control room is the final area in Stray that you and B12 will enter together. After helping Clementine in Midtown, you'll have a nice subway ride before reaching a bright, unassuming area where the robots are still only cleaning Companions as opposed to the almost human bots in the rest of the city. This guide will help you gain access to the control room and what you can do once inside, but beware of spoilers for Stray's ending...
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Stray: How to unlock the control room
Source: PC Gamer (opens in a new tab)