Bought this for my 5 year old who loves the Sticky Mosaic Cards and also recently has a thing for castles and knights. We put it together with a little girl friend of his and they worked on it for 2 hours, alternating sticking on tiles and coloring. My 8 year old joined in too. Eventually I put it together and we kept working until it was finished and then they played with it. My husband couldn't believe we made it and how sturdy it turned out to be. There seems to be something therapeutic and addictive about sticking those little tiles on the boards.. Also great for developing their fine motor skills!