make the fitst number of rotations then knock once on the door, make the second number of rotations and knock on the door once, do the same for the third number and the door will open on the last knock.
Lmao I forgot about this game after giving up on the first puzzle but I just came back to it and finished it in one go. Honestly, the one I had the most trouble on was the first one, since the key is at the top of the page I thought the directions were going from bottom to top. Bit of a confusing first puzzle but overall pretty good game. Nice job.