Classic jigsaw puzzles are good fun for people of all ages.
When two pieces fit perfectly you are quite certain this is correct.
and you can continue with the remaining pieces.
In fact the puzzle gets more simple after each placed piece.
Normally there exists only one solution.
Links to classic jigsaw puzzles:
Mathematic jigsaw puzzles are the opposit.
You often find pieces that fit perfectly,
but you have no clue that this is correct.
You often aren't much closer to any solution until the last piece fits!
There often exist more than one solution, sometimes milions !
But if they are simple ... I'll leave it up to you.