No, it’s not mandatory
Can I get another hint? I can't figure it out. I've tried interacting with every object . I know about the hole, the rope, the noise from Naria, and that there's no noise from the hole when Lina goes to it. I also know the stone is supposed to say something.
What am I missing? I've also had Naria and Lina interact with the book, Naria wrote her name, and Lina drew a c*ck on it.