I would rate it a three, but because the kids like it I'll give it a four. The problem is how to build it. It doesn't have instructions but it's pretty easy to just make your own race BUT it's pretty flimsy and I was frustrated helping my kids assemble it. Also, you have to be patient because it can be very difficult to figure out how to make all the bridges and curves work correctly so that the balls have different trajectories! This gives you more room to work, but it also helps balance the set because as we said, this thing can be very weak. Fell down several times while assembling.
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