This... Wasn't my best project, but I did it using just 10 blocks (I'm pretty sure at least... I could've accidently slipped up) for the 10 block challenge. Just click the green flag and watch, listen, and read. Good luck (on saving Happyville)
Welp. I didn't make the riddle up, I found it online. I'll put the answer down there. Also, don't be playing with your keyboard when watching it because the answer to the riddle is a letter. The answer to the riddle is: the letter U.