I understand the game was rushed, so there are some flaws. I apologize for the inconvenience.
The second digit of the code is the poster in the hallway.
Thanks for the game and the review! I'll definitely check out your game when I have time!
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No, I already found the second one. I couldn't find the third one. Also, I assumed the lock would open automatically if I entered all the numbers correctly, but it turns out the text at the bottom is a button and we have to click it :) I solved it through trial and error and continued to the next room.
Btw, the game doesn't have any serious flaws. Aside from what I mentioned above, it's a polished game. The quality of the visual art saves the flaws :)