Logical jigsaw puzzle consists of circular wooden boards, colored knots, and perforated nails. Circular holes are evenly distributed on the wooden board, and perforated nails are inserted into the holes. Colorful knots are connected to different nails at both ends to form a cross rope net. In teaching, students need to adjust the connection method of the knot based on the color, position, or numerical clues of the knot, and complete specific patterns or logical sequences. This teaching tool is suitable for primary and secondary school logical thinking training, transforming abstract logical reasoning into concrete knot operations, and cultivating students' observation ability, pattern recognition, and problem-solving ability.