Newgrounds is not the place for jigsaw puzzles, if you know what I'm saying. Try put this on some other flash game site.
It's pretty plain, the sound for placing a piece in the correct position is really annoying, and there is only one puzzle. An idea would be to place a mute button in the game for people who get frustrated by that sound, and you should have harder puzzles of Ronaldo, with each level having more smaller pieces.
A jigsaw puzzle? What's next, virtual lawn work? Virtual high-school homework?
No challenge, no replay, and annoying sound that can't be muted. Sorry, pal. Thanks for playing.
3 minutes to complete puzzle = challenge. About the others..you are right..i ll improve it.