to19At the beginning of the century, new large-scale industrial technologies gave jigsaw puzzles a clear form. Previously, large and cumbersome puzzles were composed of smooth edged fragments arranged together, which could be separated by a slight vibration. in1840Around the year, puzzle manufacturers in Germany and France used interlocking biting machines to cut puzzles, and modern puzzle enthusiasts are familiar with this form. They replaced hardwood sheets with soft wood, plywood, and cardboard, greatly reducing costs. The final low-priced puzzle was accepted by consumers from all walks of life, and soon sparked a frenzy of puzzle playing among children, adults, and the elderly.