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{"difficulty": "medium", "puzzle": [[0, 8, 0, 5, 3, 4, 0, 0, 0], [4, 0, 0, 0, 0, 7, 9, 0, 0], [3, 7, 6, 0, 0, 2, 0, 0, 0], [0, 6, 0, 0, 0, 0, 3, 0, 4], [0, 0, 0, 7, 0, 0, 0, 1, 0], [0, 0, 9, 0, 0, 0, 5, 0, 2], [0, 0, 4, 0, 5, 0, 2, 0, 0], [0, 0, 7, 9, 0, 6, 0, 0, 8], [0, 0, 5, 4, 0, 8, 1, 9, 3]], "solution": [[9, 8, 1, 5, 3, 4, 7, 2, 6], [4, 5, 2, 8, 6, 7, 9, 3, 1], [3, 7, 6, 1, 9, 2, 8, 4, 5], [5, 6, 8, 2, 1, 9, 3, 7, 4], [2, 4, 3, 7, 8, 5, 6, 1, 9], [7, 1, 9, 6, 4, 3, 5, 8, 2], [8, 9, 4, 3, 5, 1, 2, 6, 7], [1, 3, 7, 9, 2, 6, 4, 5, 8], [6, 2, 5, 4, 7, 8, 1, 9, 3]]}
