First of all, my kid loves it and has created some impressive courses on our fridge. However, I did need to fix a few pieces of plastic protection on the marble front which began to peel off after a month of fairly careful use. Transparent packaging served its purpose, so there were no particular problems. Another slightly more serious problem is that the pieces move slightly when a ball falls on them, and the "trap" element can't even stay in place once all four balls provided are placed in it. Note that I have an old fashioned (1980's) painted fridge, so the problem isn't that the stainless steel finish or anything else isn't ferrous enough. However, it is fun and educational. A few more details, stronger magnets and better adhesives and this could be a five star toy.
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