For all who need this info, this is what I've figured out so far.
- The 3 digit code starts with "88" - If this is somewhere as a clue, I didn't see it. I'm not telling the last digit in the interest of not spoiling the game, but that number is the one you should be able to guess. So the code is 88X.
- If you choose to not save the body in front of the Cabin set, that is a PERMANENT decision and you will be playing the game as only Ranboo. This isn't the default and you will miss out on a lot of dialogue lol.
- Save the game BEFORE you leave after unlocking all 3 locks. You can get through the door if the bottom box turns black. If the top box turns black, the game unfortunately stops responding and becomes unwinnable. You can just refresh and play from your save point though.
Lots of replayability. I need to come back to 1) see if I can get through the door as only Ranboo - when I got that door glitch before, I thought it was because I hadn't been playing the game as intended, and 2) to go look at everything with Charlie and not Sneeg, based on that sink dialogue lol.
Incredible game, so much fun! I have enjoyed ripping Ranboo's mask off of them and supergluing it to everyone I add to my party... everyone gets a turn with the torture mask :)
Edit: I am pretty sure that ending with Ranboo-only isn't a glitch... poor guy... Although poorer Sneeg if you just leave him behind and still complete the game!