The Boy is getting to the point where he comfortable completes 35+ piece jigsaws, using the image to help him identify the correct pieces. He's got the tricks of finding the edges and corners first, then working out the different sections of colour, quite practised and enjoys piecing jigsaw puzzles together.
We were recently sent the new Orchard Toys Big Police Car jigsaw to review, and although it has fewer pieces than he's used to (30 pieces) it actually offered him quite a large challenge due to the nature of the design.