I'm the creator of a new and hopefully awesome variation to the Rubik's cube puzzle. It's called 'xCube' and it's available on the app store. It has the traditional style with sizes 2x2x2, 3x3x3, 4x4x4, 5x5x5, & 6x6x6. It also has variations where you have to solve internal cubes. Has anyone tried it out? If so, what do you think?