This has Rubik's Cube challenge and Sudoku too. Not only do you have to match the colors, you also have to get them all in numerical order, so it's harder than it sounds. However, this would be a great gift for anyone who loves such big challenges. It's sticker-free, so you can't just goof around and peel off the stickers like you would a sticker cube. The parts rotate very smoothly, which is also nice.
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