The M&D sound puzzles are lots of fun for little ones (my daughter got her first at 1.5 years old) and provides excellent encouragement for her to keep at it until the puzzle is complete because she loves hearing all the sounds. My main critique is I wished the sounds ONLY played once the proper piece was fitted into its slot, signalling that the child got it right. As is, it plays whenever the light sensor is triggered; so it goes off when you try to put any piece in any slot, and as other reviewers have pointed out, when you turn the lights off in the room (if the puzzle hasn't been put back together and there are empty slots). That part is annoying. Even so, it's still a fun activity and helps kids match up sights and sounds and has earned many smiles and giggles from my daughter. I'd recommend it.