The QiYi OS Cube is a 2x2 with a twist. This puzzle is magnetic, larger than a standard 2x2, and the "tiles" on it pop in and out depending on the turns your make. The solved state is a cube with perfectly flat faces. Give it a shot and see if you can do it!
This 6-color version allows you to solve this puzzle like a simple 2x2. The tiles still pop up while turning which gives this puzzle a very interesting texture