Problem solved... sort of: Mathematicians come up with formula to complete every Sudoku (but trying to understand it could take even longer than doing the puzzle) | Daily Mail Online
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The hardest Sudoku in the world" that a mathematical expert created over three months - GIGAZINE
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Magic Word Square: Hardest Sudoku Puzzle
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The hardest Sudoku in the world" that a mathematical expert created over three months - GIGAZINE
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True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku? | Daily Mail Online
Amazon - Global Solution For Sudoku: Ma, Zhong-qi: 9789811224614: Books
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Solving Sudoku by Heuristic Search | by David Carmel | Medium
Global Solution for Sudoku: Ma, Zhong-Qi: 9789811224607: Amazon.com: Books
