How do you solve the locker puzzle in Routine? Before you can access the innermost areas of the Ward, you need to track down James Mason's ID to upgrade your security clearance level. There's just one problem: Mason has locked himself in the Vestibule, and you need a four-digit code to unlock it. Kali's locker has all the clues you need to solve this puzzle, but Mason's code diagram isn't easy to crack. Between the polaroids, symbols, and numbers, we found this to be the hardest puzzle in Routine - and that's before you take into account the entity stalking the halls. If you're completely stuck, here's how to solve the locker puzzle and proceed through to the Vestibule in no time.Read the full story on PCGamesN: Routine locker puzzle solution