Uwe meffert's puzzles: Ghost cube - the goal of this puzzle is easy to understand - form into the shape of a cube - but the uniform colour of the panels make it deceivingly difficult to solve. The seemingly arbitrary directions in which the puzzle turns makes this a challenge even for expert twisty puzzle enthusiasts. > Uwe meffert's puzzles: an original since 1976. Uwe Meffert started designing rotational puzzles in in 1976 with the invention of the pyramid. Since then, he has created over 100 styles of rotational puzzles that are distributed worldwide. Uwe is a leading designer in the puzzle community and delights in finding intriguing new ways to puzzle his fans.