This is purely out of interest because I'm genuinely shocked how fast my DS has grasped how to do puzzles. Started with very basic 2 /3 piece ones at Christmas. Now he can do up to 16 piece puzzles with ease and independently. I'm presuming it's because he's got such an interest in them and is very patience whilst doing them. He's not interested in toys such as cars/toy garage. He only turned 2 a couple of weeks ago...