I found that puzzle at the hero's memorial, but I still don't get it. How do I choose correct 7 letters among those 21 letters?? Is there another hint in the game? Or does it have regularity itself?
I'm happy you figured it out!
The game is about overcoming difficult adventuring puzzles. The reward is seeing the puzzle become solved after being stuck on it for a while. For that reason, I couldn't give any hints, because that would go against the spirit of the game. It's all about the puzzles.
Thank you for persevering!