My kids aren't yet able to build this without help but they like playing with it once built. The instruction sheet had an error, but I was able to figure it out. The spiral is cool, and the pieces fit the Duplos well.
Tip: If you don't have enough half-size Duplos, you can use Legos wich are compatible with Duplos (but not the Imagine Trax pieces) and are the same height as the half-sized Duplos.
