At first, there were 15 leprechauns when the three pieces of the puzzle pieces were put together. However, after swapping the two smaller pieces, there are now only 14 leprechauns left. One of the leprechauns has vanished!
So, how is this possible?
This is based on the missing square puzzle. However, no square is missing in this case. Instead, the leprechaun is the one that disappeared. Interesting isn’t it?