Normal sudoku rules apply. Cells separated by a knight's move cannot contain the same digit. All lines sum to the same total. Any three adjacent digits along the teal "modular" line have different residues modulo 3 (i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}). Box borders divide the blue "region sum" line into segments with the same sum. Along the pink "renban" line, digits form a consecutive sequence in any order. Along the orange "dutch whisper" line, adjacent digits differ by at least 4. Along the gold "nabner" line, digits do not repeat and no two digits appearing anywhere on the line can be consecutive. Any three adjacent digits along the peach "entropic" line contains one low digit (123), one middle digit (456), and one high digit (789). Along the green "german whisper" line, adjacent digits differ by at least 5. Digits along the red "parity" line must alternate between odd and even.
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