We have a great time with this with our 5 and 2 year olds. The balls have to have the words "crazy forts" on top when ever being used - as the instructions state, and then you are good to go - all angles should work. It is a great hands on, family activity. Our girls help direct how to build the forts, castles, igloos, etc. They get to use their imagination too, which is always worth encouraging.