I am pretty sure there is a bug with the "No key no lock, 3 riddles on the rock" Dwarven puzzle (Entry 530 in the book). I reversed engineered the answer from the book leading to entry number 131 in the book. And since there are no other entries that point to this number ( did a search with the kindle version), 131 should be the correct answer. However, the Adventure Cow Infinite version says its wrong. Is this a bug with the program?