One image: a blue sky. 96 pieces to put back. Take your time, nobody has finished it.
Not technically: every piece has exactly one place. But the sky is almost uniform, so there are almost no visual clues. Only the shape of the pieces can help you.
The timer starts when you touch your first piece. When you want to stop, click "Share your score" to get an image to send to your friends.
Yes. Free, no sign-up, directly in your browser, on computer or phone.