My 13 year old and 8 year love these. They have been playing with them since we got them. I've always been quick with a rubik's cube, but these other types are more difficult for me. They're definitely a challenge. I was pleasantly surprised at how good a quality these are. They move smoothly and easily. They dont get stuck, at least not yet they haven't. This a really fun set that engages the mind and provides a challenge. My kids love it.
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