The final, twelfth chapter of Stray involves a visit to the Control Room. Our guide will help you with activating the subway car and reaching the final area, as well as unlocking the control room and finally, completing a puzzle involving disabling the access lock. We also supplied a walkthrough for the final scenes (without spoilers regarding the fate of B-12)
Activating the subway car
After your arrival back from the Jail, you'll find yourself at the Midtown subway station. You'll receive the Subway Key from Clementine -
travel to the station itself and explore the corridor adjacent to it. There is a battery slot in the area shown in the screenshot where you can put the battery obtained in Chapter 10.
Proceed to the first subway car . Climb onto the seat and use the key on the console . The car will become mobile, bringing you to a new area.
Unlocking the control room
There aren't any opponents in the new area - you can optionally talk to servant robots. Your destination is the door to the leftmost control room, which is locked.
Examine the right panel. After listening to what B-12 has to say, find a robot-crate in the area and activate it.
Bring the robot-crate to the left panel and climb onto him. A panel will be uncovered - attack the exposed cables with your paws. While you were occupied, B-12 has taken care of the right panel, allowing you to access the control room.
Disabling the security lock
As you enter the control room, listen to what B-12 has to say, and approach the main computer. Examine it.
To turn off the consoles, you need to step onto keyboards. Active consoles are marked in blue.
Time to move to the side room.
The screen shows 3 yellow padlocks and a System is Locked message. You're going to have to hack the system.
There are 3 terminals in the room which you can activate in any order. You will recognize them by the padlocks displayed on their screens.
You need to find a panel near each terminal. You have to interact with it and slash the cables with your claws.
Doing this will allow B-12 to hack in, but first you need to give it the correct command while facing the blue screen.
After 3 successful hacks, the B-12 will shut down. Pick up B-12 and move it to the location where you previously learned about the system lock. By placing the drone in the rectangular field, you will proceed to the ending.
The finale doesn't require you to perform any special actions.
You can approach the large glass wall and watch the slowly unraveling roof.
To continue, leave the control room and go right. There is a new, previously unavailable, pathway (screenshot).
After using the stairs leading to the surface, the credits will start to roll - congratulations, you've finished Stray!