Kugellager puzzle

This puzzle is similar to Tower of Hanoi, The Brain etc. The object is to slide the balls to the opposite end by shifting right and left the dark wooden piece. 1250 moves! Moreover, it's easy to lose track and accidentally reverse the direction and move back to the starting position. Intellectually stimulating? No, since there's no thinking involved. Nevertheless, it's an intellectual achievement and belongs in the collection of serious puzzlers. Produced by Jean Claude Constantin.