The "mysterious compass" purchased from the store was originally intended to be used to search for hidden gems, but after being used in desert levels, the pointer was blocked by sandstorms and kept spinning. Just as I was about to give up, I noticed that the trajectory of the pointer's rotation marked the pattern of gemstone arrangement. Following the clue to eliminate, I instantly cleared the level, and the screen popped up with the "Wind and Sand Secret Language" pop-up window. It turned out that this prop could imply the logic of elimination.