Polo Glider is a design by Alex Polonsky. It combines a 1x2x2 core with moves similar to Alex Black Hole. One can also see it as a handicapped 2x2x2 cube with one piece missing, and allowing only half turns over two of its three axes. The puzzle should not be too hard to solve. One of the seven sliding cubies is attached to the core, but it slides as smoothly as the other six cubies.