This key-counting puzzle is harder than it first appears because several keys overlap and a few smaller ones are tucked between the larger pieces.
The easiest way to solve it is to scan from the top left to the bottom right and count each complete key only once.
A careful count gives 18 keys.
Overlapping objects make visual counting puzzles deceptively tricky, so a second pass often changes the first answer.
Answer: 18 keys.


