This puzzle was hours of fun as a kid. It was just a box of wooden blocks with pictures stuck on each side. There was a bus, car, plane, ship, steam train and a second newer train. After a while we worked out that once you got one image correct, you could flip a whole row at once to see the other pictures. It wasn’t quite the same thrill as working it out from scratch but it taught us to cheat and cut corners early in life and that was a valuable lesson that served us well from thereon in.