Original idea by Yosuke TanakaHand-crafted by Hideaki Kawashima (Karakuri Creation Group)https://karakuri.gr.jp/en/products/co-9-3/Object:  open to find the secret compartmentNote, all plungers operate fine for both storage and solution.  Please see videos here:  https://drive.google.com/file/d/1RDen3cwUjuV2kjz2KGQBpQ7LPr-5YUZ5/view?usp=drivesdk and   https://drive.google.com/file/d/1TSE9vEfJmqpcKimJigW8X36Tni3-LtI6/view?usp=drivesdk (caution, second one shows solution).Free shipping from...