This is Junichi Yananose's second sequential discovery puzzle. It requires approximately 15-20 steps to open and tools will be found along the way. The wheels do rotate so care must be taken when opening the puzzle. Measuring 178 x 78 x 76 mm. it is crafted in Koto, Blackbean, Jarah, PNG Rosewood. This puzzle won the Jury Grand Prize at the 2019 Nob Yoshigahara Puzzle Design Competition held in Japan !