Master 11 years old loved his birthday present and built the tower very quickly, tho he had trouble deciding which of the 3 choices of what he could build.
The castle is awesome, it's has a water wheel, which, when you spin it, on the other side, on the inside, it's a blacksmith shop with a hammer that goes up and down as it spins. There is a fruit market, prison with bones in it, a well, a throne room, working bridge and lots of little rooms on the castle.