In which I solve an EXTREME SUDOKU for Twitter
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Tutorial #40 A must know technique. NOT a puzzle.
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Tutorial 58. Hard sudoku puzzle with lots of techniques.
Sudoku. A real classic expert level sudoku. How to solve a hard level sudoku. Hard sudoku puzzle -2
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Sudoku 'expert' level tricks. Sudoku expert level. How to solve sudoku expert level #puzzle
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sudokukingdom very hard level.
