We've been on a "quiet toys" kick lately. First there was the shape sorter, then the ball pit(he can be noisy while using it, but it doesn't technically play music/make noise...so it counts, right?) and now we have a puzzle. He understands the basic concept: remove the pieces and then replace them. He has a bit of trouble putting the pieces back in the right spot - he likes to just set (okay...throw) them on top of the puzzle. I'm not too worried about that - it is an ages 2 and up puzzle, after all!