You can also find a stone man with a bell and drum in the northern maze. You can get a key by tapping the bells and drums in his hand in the order in which they are displayed. The tapping sequence here is: bell 1 drum 3 bell 1. If it is correct, you can get the bell and drum key. It can be used to open the treasure chest in the northeast maze, and obtain symbols such as the dustpan of the dustpan master, the nine-day response, the fatigue of the dragon king, the hidden inflammation of Yan Bo, and the six earthquakes in the earth.