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I quit. 😡😡 it is one of the most difficult puzzles I have ever solved. Original in second image. : r/sudoku
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The Most Difficult Sudoku Puzzles: 1305 Extremely Hard Puzzles For Adults and Teenagers - Publishing, VisCulture: 9782958068820 - AbeBooks
Sudoku Solver in Python - Lior Sinai
Which is more challenging, Sudoku or crossword puzzles? Why? - Quora
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