Dr. Sudoku Prescribes #8 – Tight Fit Sudoku

Tight Fit Sudoku (1-8) by Thomas Snyder


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: Somewhere Over/Under the Rainbow

Rules: Standard Tight Fit Sudoku rules. Range is 1-8.

Answer String: Enter the 2nd column from top to bottom, followed by a comma, followed by the 5th column from top to bottom. (Note: for the tight fit cells, enter the top digit before the bottom digit as would be normal for the read order of the digits.)

Time Standard: TFSudoku Master = 1:30, Expert = 4:30, Novice = 15:00

Solution: PDF

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 and in The Art of Sudoku 2.

  • Ravi says:

    My first time solving this variant.
    First I broke the puzzle (but did very fast only to be broken at last digits), I read the rules again and then finished in 7 min.
    Very nicely constructed.

  • tamz29 says:

    It’s hard to make a hard TF Sudoku

  • Isukada_sudokus says:

    This is EXTREMELY hard if you don’t read the rules! I’ve done a variant very similar to this without the rule that the top number must be smaller and it took me 4 minutes of looking for a break-in to finally look at the rules!

    • Avatar photo drsudoku says:

      Every puzzle here has its own puzzle information and history page. I’m trying to make them interesting pages so I encourage you to look at them.

      I have no comment on what other variants are out there from other authors. None should be using the name Tight Fit without my smaller/larger twist.

  • Ziti says:

    1:34 here, which seems about right. Artistically constructed and fun to do. I like that it’s 1-8 instead of the usual 1-9, even if it’s only a slight adjustment.

    • Avatar photo drsudoku says:

      While the broadened ranges didn’t show up in Mutant Sudoku, they do in Wei-Hwa and my new Tight Fit Sudoku book so I thought I’d continue to explore them here as one means of getting easier/harder puzzles.

  • Fred76 says:

    2’11, but I’m a bit drunk. It reminds me some contests during WSC late at the bar…(I always found interesting to study the effects of alcohol on the ability to solve puzzles, haha !)

  • neeraj says:


  • skynet says:

    5 mins 7 secs in my first tight fit sudoku..

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