The riddle is perfect if the adventurers know even a little bit about dwarves. The players guessed correctly and it was a cool moment (my favorite, i think).
I'm lucky to have some heroquest fans at home so we can play more regularly but for years, it was also a game every two or three months ! ^^
If your group play my quest one day or another (and even if you play others), i wish you all a good time !