It's a pity the riddle is already solved because I would have loved to have said the correct answer and won a prize. I enjoy solving puzzles like this. I think that mysteries are especially useful for children. They help develop logic, attention, memory, and spatial thinking. This game helps keep your child occupied for a long time, which he will enjoy and practical. You can play alone as well as with friends. For adults, such a pastime is also beneficial. First and foremost, this game will help you relax after a hard day's work. I always play free jigsaw puzzles after work and relax that way.