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    When an issue is specified, the language has to be noted, with insuffient information.

    If this is still an issue, please reraise noting the language(s) which need to be addressed.

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    Harder one? I even included 2 puzzles that are imperfect / have multiple solutions if you dare to try the beta and collaborate to make it approved!

    http://www.codewars.com/kata/hard-sudoku-solver

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    The test cases need some rework anyway (at least in the Haskell version). So if you feel like it, you could write your own Kata with generator and validator.

    I guess mine runs in O(n^4), where n is the grid size (only if block size is fixed). I'm interested how you could improve that. Often times you just combine randomness, luck and a heuristic approach (e.g. first check columns/rows/blocks with few missing elements), this could maybe somehow lead to O(n^2). But I guess I'm not wasting enough time with playing sudokus. :)