Mystery of the 18-Minute Detective and the Locked-Room Gondola Yodaka Records Yami Co., Ltd. I am selling this after completing it. I opened it and solved it once. This is a used kit. It is in the same condition as when I finished solving it. This is for those who want to know what it's like. Therefore, I am offering it at a significantly reduced price. Please understand that this is a used item. I am also selling other take-home mysteries. Please feel free to inquire if you would like to combine shipping. Mystery Solving Take-home Mystery Mystery Solving Kit Yodaka Records Yami Co., Ltd. Escape Game