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Bram Cohen🌱 on Twitter: "A standard Arrow Sudoku. Every circle cell contains the sum of the cells in the arrow going out of it. https://t.co/Wnan3jSEJU https://t.co/HRZ4rUNjHu" / Twitter
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Will Shortz Presents Sudoku Forever: 200 Easy To Hard Puzzles - (easy To Hard Sudoku) (paperback) : Target
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