The Hercules Sudoku puzzles are the most difficult sudoku puzzles in the world. If you solve the puzzles correctly, you can earn a free book of your choice from Konokopia.
from Free - United States - Latest News http://www.prlog.org/12253768-the-worlds-most-difficult-sudoku-puzzle-contest.html
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from Free - United States - Latest News http://www.prlog.org/12253768-the-worlds-most-difficult-sudoku-puzzle-contest.html
via IFTTT
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