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A Mixup Cube with all corners bandaged together and hidden in what does not look like a twistypuzzle.
Functionally, the O4 cube is a Mixup Cube with all the corners bandaged together. The centres and edges move on a rails mechanism, which is connected to the external cage. This can be considered the sequel to the O2 Cube which used the same concept but only for a 3x3x3.
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