Sudoku hard: September 16, 2023

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Jigsaw Sudoku Puzzle (Daily Sudoku League #187)

Very hard difficulty Sudoku board used for testing (17 givens) [18].

SUDOKU Facebook

Puzzle World

Sum Frame Sudoku

Puzzles for Sep 11 Number search/Sudoku/Word search/Crossword - IEyeNews

Puzzles: Printable Crossword - Issue: September 9/ September 16, 2022

Sudoku Answers Issue 19

IRENE HAO Archives - The Observer

Extra special – Butterfly Killer Sudoku (hard)

Everything about Sudoku Game: The Ultimate Brain-Teasing Game

👉 Sudoku Challenge Pack, KS3 Maths

Solving Sudoku, Revisited – Andy G's Blog