Do you see turning colors every time you close your eyes? Are basic 3x3 Rubik's Cubes too easy for you? Try your hand at the Rubik's Cube 4x4. Does it look easy? Wait until you get it in your hands. You may think you will be able to solve this puzzle quickly, but then you make a turn on the cube and it changes all over again. Want to know the secret? There is no center.
