Rubik's Tower 2 x 2 x 4

Rubik's Tower Puzzle or 2x2x4 Rubik's Cube is an interesting twist on the original Rubik's Cube. Imagine two 2x2 Rubik's Cubes, on top of one another, that rotate around a central axis allowing this puzzle to shape-shift. That's right - this allows for an especially diabolical twisty puzzle and makes it very difficult to solve!