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CHALLENGE: disentangle the long loop from all nine rings The solutions is an extremely difficult sequence of stes: minimum 511 steps Difficulty: INCREDIBLE 5/6. Medium resoluton time: 1 hour - 1 year Dimensions: 19 x 1 x 7 cm / 7.5 x 0.4 x 2.7 inch BOX dimensions: 21 x 2 x 10 cm / 8.3 x 0.8 x 3.9 inch, Manufacturer: LOGICA GIOCHI