Shape by Shape, Thinkfun

This puzzle has 14 removable chunky plastic pieces which fit onto a base. There are 60 puzzle challenge cards to work through with hints on the back if your child (or you) get stuck. It's great as it's all self contained with it's own plastic lid. The box says 8 to adult but my friend's DS who's 4 really enjoyed ours and we all play with it too (DS9 and 2 Grown-Ups).