My son received this toy for Christmas and loves it.It comes with enough parts that you can build this in a lot of different ways.The instuctions are vague,so we used the picture on the box to set it up the first time.After that we were able to come up with our own ideas.My son loves the fact that you can race four marbles at once.The marbles that came with it go down the track with ease,and so do the marbles I bought at the store.