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Adult jigsaw puzzles are puzzles that are designed for individuals who are at least 18 years of age or older. They typically contain a higher number of pieces, intricate designs, and challenging patterns that require a higher level of concentration and problem-solving skills to complete. These puzzles often feature complex imagery, detailed artwork, and sophisticated themes that are geared towards an adult audience. Adult jigsaw puzzles provide a stimulating and engaging activity for individuals looking for a more challenging puzzle-solving experience.