The QiYi OS cube is a 2x2x2 puzzle with an additional feature: the tiles pop in or our depending on the turns you make, the goal is to get them all popped in.
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Such a simple cube but a very novel challenge. Can be baffling at first and sometimes solved by luck, but there's a definite logic that can be used to solve it once you figure out what's going on. Very smooth and satisfying to turn as well, and a great fidget toy as well as a puzzle.