1000 Extreme Sudoku 1.0 1000 very hard printable sudoku puzzles,Extreme soduku puzzles need some advanced soduku strategies,Such as Uniqueness, Single Digit Patterns,Fish
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My SUDOKU 1.62, The Game From Endless Time In 1849, prominent mathematician Leonard Euler published his work «De quadratis magicis» («On magic squares»), describing properties and construction of «squares of digits» with special constraints for sum by rows and columns. In 1979, American architect Howard Garns published in Dell Magazines a puzzle called