Bonus: Tight Fit Sudoku (Difference) by Prasanna Seshadri

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This puzzle is a special Birthday Sudoku variation by Prasanna Seshadri, marking March 2, 1991 to March 2, 2022.

Tight Fit Sudoku by Prasanna Seshadri


or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku = big digits and Number candidate = small entries in the corners of cells.)

Theme: Tight Fitting a New Beginning

Author/Opus: This is the 229th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Variation of Tight Fit Sudoku rules: Insert a number from {0,1,2,2,2,3,3,9} into each cell so that the full number set appears in each row, column, and bold region. Some white and black circles are given on some slashes. If there is a black circle with the slash, the bigger number must be above the smaller number. If there is a white circle with the slash, the smaller number must be above the bigger number. A number in a circle gives the difference between the two values in the cell with the slash. If the difference is 0, the color of the circle is irrelevant.

Difficulty: 2 stars

Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:30, Expert = 7:00

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

Note: Follow this link for other Tight Fit Sudoku puzzles on this website. If you are new to this puzzle type, here are our easiest Tight Fit Sudoku to get started on. More Tight Fit Sudoku can be found in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli, in The Art of Sudoku 2, and in Masterpiece Sudoku Mix 5: Tight Fit Sudoku.

  • R says:

    Took a while to figure out all the rules! quite easy after that

  • mender says:

    This one was really fun and unique. Hats off to Mr. Seshadri!

  • nkm says:

    Am I missing something with the colored circles? Seems like they don’t have any impact on the logic, so is there supposed to be theme content from them that is going over my head?

  • Nompass says:

    Yea probably, order becomes important for the main diagonal, as it spells out the birthday of Prasanna. I won’t be surprised that if the other numbers also has some significant meaning to him as well.

  • jasg says:

    uzz, jryy va gjragl-gjraglgjb ur jnf guveglbar, fb gung purpxf bhg. fb va gjragl-gjraglguerr ur’yy or …guerr?

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