My 8 year old grandson loves these Magic Cube puzzles. They usually come in 3x3 format, but he's got it covered. He wanted a 4x4 and Grandma bought it. He has one too, but now that he arrives, a challenge awaits him. I'm sure he'll find out soon, then Grandpa and I will see what we can do. Fun and challenging spirit. I recommend all sizes.
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