Japanese Sums by Prasanna Seshadri

Japanese Sums by Prasanna Seshadri


or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)

Theme: Stopped on the Way Back

Author/Opus: This is the 211th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Place the digits 1-9 in some of the cells, so that no digit is repeated in any row or column. Numbers on the outside of the grid indicate the sums of adjacent digit groups in that row or column, in order. Each sum is separated by at least one unused cell. A ? can represent any sum of 1 or larger.

Japanese Sums Example

Difficulty: 4.5 stars

Time Standards (highlight to view): Grandmaster = 10:00, Master = 19:15, Expert = 38:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Japanese Sums puzzles.

  • sudgy says:

    Would it be possible to give a bit of extra space on the outside of the grid in Penpa? I sometimes like to write notes on the outside of the puzzle on certain rows/columns, but currently there’s not much space to do that.

    • On the top left you’ll see a “resize” button. If you click that and click “bottom+” it adds more white space to the bottom of the grid. I’m guessing on some other puzzles it will add another row to the grid, which can be removed by going to the “BOX” tab and dragging it out.

    • Note: Swaroop pointed out to me that doing what I suggest will stop the answer check from working.

  • skynet says:

    24:10.Amazing creation ! Very fun right till the end.

  • sudgy says:

    I just tested, and changing the size back to normal at the end makes the answer check still work. I’ll probably do this if I want to take notes in the future.

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