This moon-counting puzzle looks easy until you notice that several of the larger crescents contain smaller moons inside them.
The best way to solve it is to scan the picture slowly from top to bottom and count every separate crescent shape only once. Do not forget the tiny moons tucked inside some of the larger ones.
When all of the large, small, and hidden crescents are included, the total comes to 21 moons.
These visual puzzles are designed to make your eyes skip over the smaller details, so a second count often helps.
Answer: 21 moons.
