A himitsu-bako is a traditional Japanese puzzle box that is designed to securely store valuables. These intricate wooden boxes are often made from various types of wood and feature beautiful craftsmanship, including detailed carvings and inlays. The box can only be opened by solving a series of sliding mechanisms, making it a fun challenge for users. The art of creating himitsu-bako dates back to the late 19th century in the town of Hakone, which is famous for its scenic beauty and craftsmanship. Each box is unique, with different designs and levels of complexity, appealing to collectors and puzzle enthusiasts alike.