Simply use the Moon Dust (blue crescent moon) on the "Blue Moon Rock" mysterious object for 3 times consecutively, till the "crescent moon hole" gets completely filled up with light.
Perform this consecutive action quickly. Because the "light/energy" fades out very fast!!
You will then have solved its mystery. Also, as a result of the activated "Moon Rock", you can now enjoy frequent drop-downs of the Moon Dust onto your island!
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This is a PC file; it won't install on a Mac. Please continue if you plan to save this file and install it elsewhere. Or, cancel to go back and choose another format.