After you’ve exited the Academy of Sciences and found yourself behind the gate from one of the previous chapters (in which little Ignat was controlling a toy car with a remote control), take a moment. First, there’s a terminal in the hallway with the offices. If you try to play Tic-Tac-Toe on it, it will malfunction. You’ll see a blue screen and earn a secret achievement. Another challenge is a locked safe in the office of Chief Engineer Filatov, Ignat’s father. We’ll tell you how to open it.

It’s actually quite simple. To the left of the safe hangs a painting with strange patterns. It’s actually a stereogram. If you look closely, you might be able to spot the correct combination. If you don’t want to ruin your eyesight, I won’t judge you. Instead, I’ll give you the password to the safe in Dr. Filatov’s office—5201. Enter this combination and take 9 shotgun shells.