I'm a big advocate for water play learning -cause and effect. Purchased this for my two year old grandson. Boy was it disappointing when not all the spinners spin when water is poured from the top. Tried to get it going by using a small water pitcher to help manipulate all spinners. Well, after trying to get it to go several times, our toddler lost interest and wanted nothing to do with it. Tried again with the water spout, the big blue spinner will spin but the bottom two yellow spinners barely moved. Not sure if ours is defective. In my opinion it is a waste of money. Granted we only used it for water play, perhaps sand play may work. Ugh!