Zometool Creator 3 Construction Kit
Zometool is a great educational toy. Look, it is a lot of fun to make cool geometric stuff and then take it apart and do something else with it.
If more parts mean more fun, then the Zometool Creator 3 Construction Kit is the funnest game of all. It contains 738 precision-made components that build together thousands of different models, ranging from simple shapes to large and complex 3D structures. It makes a fantastic 13th birthday gift and an excellent way to have fun with an open-ended play.