Circle Sum Sudoku

June 18, 2007
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Here’s a puzzle that I’ve had kicking around for a while. It’s a sudoku variation that I’m calling Circle Sum Sudoku. It’s basically a cross between kakuro and sudoku. The idea was to have a sudoku grid where the clues are unknown to start. This gave me the idea of having a kakuro like puzzle to determine the clues. The result is this puzzle.

You’ll notice that there are circles in the grid, and numbers along the top and left sides. The numbers above the columns indicate the sum of the digits in the circles in that column. The numbers beside the rows indicate the sum of the digits in the circles in that row. The numbers in the grid to the right indicate the sum of the digits in the circles for the internal squares.

I’ve got some ideas for some additional puzzles, where you not only have to find out what the internal clues are, but also where they are. More on that later. For now, enjoy!

circle sum sudoku 1

pdf solution

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2 Responses to Circle Sum Sudoku

  1. June 21, 2007 at 8:28 am

    Nice one, Josh. The japanese for circle is “maru” if you want an authentic sounding Japanese name! “Maru no sudoku”??

  2. January 13, 2009 at 6:54 am

    What a challenge! I don’t know how many attempts I’ve made. I’ll be trying again this evening. I can only congratulate you Josh, with this puzzle.
    I’m glad I stumbled upon your blog.
    Regards,

    Mike