Normal sudoku rules apply. Digits on a line sum to the same total for each box the line enters. Different lines may have different totals. Any set of three sequential cells along an entropic line must contain a low digit (1,2,3), a middle digit (4,5,6), and a high digit (7,8,9). Digits may repeat on a line, if allowed by other rules. All lines in this puzzle conform to both rulesets.