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Extreme sudoku printable

24 9x9 boards below the ordinary hard tier. The generator removes clues only while the grid keeps exactly one solution, and reports the actual number it could safely leave.

24 printable sheets · Checked and published by Nora Quill

Sudoku 1: Expert, 24 clues Sudoku 1: Expert, 24 clues A 9x9 grid with 24 starting numbers and 1 opening showing immediately. The emptiest box carries only 1 clue. Puzzle #262101. PDF
Sudoku 2: Expert, 23 clues Sudoku 2: Expert, 23 clues 23 clues, 58 blank cells and 1 that resolves on sight. One row drops to 1 number. Puzzle #262102. PDF
Sudoku 3: Expert, 22 clues Sudoku 3: Expert, 22 clues A classic sudoku with 59 gaps and no square that falls out straight away. The digit 1 appears 4 times among the clues. Puzzle #262103. PDF
Sudoku 4: Expert, 24 clues Sudoku 4: Expert, 24 clues You start with 24 numbers and place the 57 that are missing. 3 cells give themselves away and the thinnest box holds 1 clue. Puzzle #262104. PDF
Sudoku 5: Expert, 25 clues Sudoku 5: Expert, 25 clues The digit 9 is the most common clue here, showing up 4 times. That leaves 56 gaps, with 2 that resolve immediately. Puzzle #262105. PDF
Sudoku 6: Expert, 24 clues Sudoku 6: Expert, 24 clues Of the 57 empty squares, none fills itself in. The poorest row has 1 clue and the poorest box has 1 clue. Puzzle #262106. PDF
Sudoku 7: Expert, 23 clues Sudoku 7: Expert, 23 clues 23 clues arranged so that 1 turns up 3 times. One solution only for the 58 free squares. Puzzle #262107. PDF
Sudoku 8: Expert, 23 clues Sudoku 8: Expert, 23 clues A board with 0 openings across 58 gaps. No row drops below 1 number and no box below 0 clues. Puzzle #262108. PDF
Sudoku 9: Expert, 23 clues Sudoku 9: Expert, 23 clues Starts with 23 numbers placed and 58 squares empty. 1 of the blanks already accepts only one digit. Puzzle #262109. PDF
Sudoku 10: Expert, 22 clues Sudoku 10: Expert, 22 clues 59 squares to fill from 22 clues, with 0 openings visible straight away. The barest row holds just 1 number. Puzzle #262110. PDF
Sudoku 11: Expert, 25 clues Sudoku 11: Expert, 25 clues A 9x9 grid with 25 starting numbers and 0 openings showing immediately. The emptiest box carries only 1 clue. Puzzle #262111. PDF
Sudoku 12: Expert, 23 clues Sudoku 12: Expert, 23 clues 23 clues, 58 blank cells and none that resolve on sight. One row drops to 1 number. Puzzle #262112. PDF
Sudoku 13: Expert, 25 clues Sudoku 13: Expert, 25 clues A classic sudoku with 56 gaps and 1 square that falls out straight away. The digit 6 appears 5 times among the clues. Puzzle #262113. PDF
Sudoku 14: Expert, 24 clues Sudoku 14: Expert, 24 clues You start with 24 numbers and place the 57 that are missing. No cell gives itself away and the thinnest box holds 2 clues. Puzzle #262114. PDF
Sudoku 15: Expert, 24 clues Sudoku 15: Expert, 24 clues The digit 7 is the most common clue here, showing up 4 times. That leaves 57 gaps, with 1 that resolves immediately. Puzzle #262115. PDF
Sudoku 16: Expert, 25 clues Sudoku 16: Expert, 25 clues Of the 56 empty squares, 1 fills itself in. The poorest row has 1 clue and the poorest box has 2 clues. Puzzle #262116. PDF
Sudoku 17: Expert, 25 clues Sudoku 17: Expert, 25 clues 25 clues arranged so that 2 turns up 4 times. One solution only for the 56 free squares. Puzzle #262117. PDF
Sudoku 18: Expert, 26 clues Sudoku 18: Expert, 26 clues A board with 1 opening across 55 gaps. No row drops below 0 numbers and no box below 1 clue. Puzzle #262118. PDF
Sudoku 19: Expert, 22 clues Sudoku 19: Expert, 22 clues Starts with 22 numbers placed and 59 squares empty. 1 of the blanks already accepts only one digit. Puzzle #262119. PDF
Sudoku 20: Expert, 25 clues Sudoku 20: Expert, 25 clues 56 squares to fill from 25 clues, with 0 openings visible straight away. The barest row holds just 0 numbers. Puzzle #262120. PDF
Sudoku 21: Expert, 24 clues Sudoku 21: Expert, 24 clues A 9x9 grid with 24 starting numbers and 0 openings showing immediately. The emptiest box carries only 1 clue. Puzzle #262121. PDF
Sudoku 22: Expert, 23 clues Sudoku 22: Expert, 23 clues 23 clues, 58 blank cells and 1 that resolves on sight. One row drops to 2 numbers. Puzzle #262122. PDF
Sudoku 23: Expert, 25 clues Sudoku 23: Expert, 25 clues A classic sudoku with 56 gaps and no square that falls out straight away. The digit 2 appears 4 times among the clues. Puzzle #262123. PDF
Sudoku 24: Expert, 23 clues Sudoku 24: Expert, 23 clues You start with 23 numbers and place the 58 that are missing. 2 cells give themselves away and the thinnest box holds 1 clue. Puzzle #262124. PDF

What is on this page

These boards ask the classic generator to dig toward 22 clues, below the ordinary hard target of 26. Some complete grids cannot safely lose every requested number; the card reports the actual givens retained rather than pretending the target was reached.

How to choose a printable

Pick the board by its reported clue count, but remember that clue count is only a broad guide. Expect candidate notes and longer chains. The non-negotiable property is one solution, rechecked after generation.

What the files contain

Every card downloads one language-specific PDF. The puzzle or activity comes first and, when there is an answer, the completed solution is the last page of that same file. Each footer names the collection and the exact sheet, so pages from a printed stack can be matched again.

Related printables

Warm up on hard sudoku. The large-print set is easier but useful when grid size matters more than difficulty.

How to use these sheets

  1. Pick a sheet and press Print. The file is a PDF sized for A4 and Letter paper.
  2. Print it in black and white at normal quality. None of these sheets need colour ink except the colour by number pages.
  3. Keep the answer page for yourself, or print it too if you want to check the work later.

How to Print These Sheets

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