Our The Jigsaw Puzzle Advent Calendars contain high quality recyclable cardboard. It can exercise memory, improve cognitive function, deepen connections, stress relief, relieve anxiety. Its use is simple: Open a box corresponding to the date every day between December 1st and December 25th. Take out the puzzle pieces in the box and assemble them. Wait until Christmas Eve to complete the complete puzzle. Improve children's manual and mental abilities and bring happiness to children.