An abacus is set into the wall across from the door. Inscribed inside the inset circle at the center of the room in gnomish is the puzzle:
“My daughter, Myta, loved to run. I went to watch her jog one day and she ran one of her favorite circuits, a near perfect circle. While I waited at the start, she ran at a steady 3 mion per minute. My dog, Cucu, ran back and forth between she and I as she ran, running at a constant speed of 4 mion per minute. The length of Myta’s circuit was 51 mion, how many mion did Cucu run?”
When the correct number is put into the abacus, the circle in the floor opens to reveal the room below.