When Kendra Kandlestar and her companions arrived at the Castle of Krodos while searching for the Box of Whispers, they found their way blocked by a riddle door. In order to pass through they were required to answer the door riddle: There is an Unger who lives on the other side of the marsh, in the boot of a giant. Seven children she has. Exactly half of them are boys. How can this be?

While seeking the Rumble Pit, Kendra found another puzzle-dealing door, a riddle gate that claimed to be the cousin of the riddle door at Krodos. The gate claimed that both it and the door was carved by the dwarf Yanu.