This puzzle is located in the tower of Thalin Tor in Stillmoor. Using the Mysterious Plaque at 1727, 2309 will take you to the puzzle. To complete this puzzle you most cage all the bats. You can cage more than one bat in the same cage, giving you more open cages for the still left to cage bats.
This puzzle is easier to do with another person, so one person hits the bells, another person closes the cages. The person hitting closing the cages will get credit, so numerous attempts may be required if you do this with another.