The WJPF recognizes and promotes the International Jigsaw Puzzle City of Valladolid as an unofficial world championship and invites all the fans of the world to participate in it.
The championship is held on the last weekend of September at the Millennium Dome. Distributes 1,500 euros in prizes among the top 5 finishers in the individual event,
which consists of mounting a 500 pieces jigsaw puzzle in the shortest possible time.
In category of teams (4 people), the team that has managed to place more pieces of a series of puzzles of between 1,000 and 2,000 pieces within a period of 8 hours wins.