Rubik's cube - invented by Ernő Rubik in 1974. Probably even he didn't imagine that his invention will have a global success. Rubik's cube is one of the most famous brainteasers, where you start with a cube consisting of 27 little cubes, each side painted in different colours. Then you mix the whole cube and the goal is to rotate the cubes back into the starting positions, where every side has its own colour. Sounds easy, but you have to use your spatial sight in order to solve it.