YJ 3x3 Mirror Cube

The YJ 3x3 Mirror Cube is a ‘shape-mod’ of the classic 3×3 Rubik’s Cube: the cube’s pieces come in different sizes and shapes, but all sides are the same colour (gold or silver), so when solving it, you don’t follow the colours, but rather the shape and size of the pieces.  

It offers a challenge even for advanced solvers.