Hmm, that's weird. We just fixed this bug in version 0.4.1 (in general, there are 39 arts in the game in total). Let's try to understand what art you have not open? Tell me which ones are next to it on the right and left, please
Yeah, I got it! When you return to captain cabin after Tovenaar (beginning of chapter 2) after talking to the elf woman, Anna comes in. You have to turn her down and just take the map. Then, when Tovenaar excites and Lauren comes in, you have to turn her down too. Then you will hear a knock on the wood and someone will be in the hole in the wall.