Puzzle 372 (Sudoku) [Star]

This is a Sudoku puzzle, with a twist. Only the numbers 1 to 7 are used in this puzzle, and two spaces in each row, column, and box will not have numbers. Those spaces contain stars instead. Two cells containing stars may not be adjacent, not even diagonally.

Puzzle 372

Puzzle 372


(Click for larger size)

If I ever do this variation again I’ll probably do irregular regions and maybe add an extra row or column. A 9 by 9 star battle with those regions just doesn’t have enough solutions for these to stay interesting.

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5 Responses to “Puzzle 372 (Sudoku) [Star]”

  1. David Scherzinger Says:

    Do the stars always end up in that pattern? It looks very nice with the givens arranged as they are.

    Also, the beginning felt a little guessy, but once the stars fell into place, it cleaned up easily.

    • MellowMelon Says:

      I don’t know if this is the only solution to the Star Battle portion up to symmetry, but I doubt there’s more than two or three ways.

      There is a fully logical path to this one, although as usual the Star Battle portion means guessing can often lead to progress. For a hint as to this method, you will need to use both sets of rules together in the top right and bottom left boxes.

  2. Bram Says:

    You could use 10 by 10 grids (or larger) with 10 9 cell regions that include black cells that aren’t part of any sudoku region.

  3. Bryce Herdt Says:

    A while back, I saw a sudoku variant where each line and area contained 1-8 and a chess piece attacking each digit once. It was noted that the solution space consisted of many essentially-symmetric grids and two others.
    What if you added a piece (by which I mean nine more pieces)? In theory, you could add rooks and queens. (These wouldn’t be stars that couldn’t touch… although half stars, half chess pieces might be easier to construct.)

  4. TheSubro Says:

    Great puzzle. Coming in late as to the discussion, but as usual I handled this in slow pure snail fashion and solved it entirely with logic coming after full blown listings of “possibles” in each cell.

    Thanks.

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