Now here's a way to supplement your puzzles without clobbering the budget! a range of sites have puzzles where you can choose images and select levels of difficulty... a nice way to show a bit of progression. This is Jig Zone - but there are others. Be aware of being on line - policy dictates we don't leave children on line unsupervised and sometimes this sort of site has add pop ups that will take you away from where you meant to be....