This takes place after you complete “Job for Robert Ramsey”.
The puzzle is related to one of the patients - John Keating.
Investigate it and you will learn that you will need a four digit code to unlock it.
Get back to Keating’s cell and listen to a short conversation with him - this is your hint.
Start with the cell close to the location where you began exploring this part of the asylum.
Go to the next cell and use the UV lamp again.
Do the math - in our case it was 4+4=8.
Visit the next cell.
You will have to add all the numbers from the marked area - in our case it was 1+2+1+0=4.
Search the last cell.
Once again you will have to do some basic math.
Just add the winning numbers of tic-tac-toe - in our case it was 2+2+1=5.
Get back to the locked gate and jot down in the code.
This site is not associated with and/or endorsed by the Bandai Namco Entertainment or The Farm 51.
All logos and images are copyrighted by their respective owners.
