Hardest Sudoku in the World : Puzzles from the World Sudoku Championships

Sudoku has swept the globe! Once a year master solvers from 22 countries compete to see who is the best sudoku solver in the world. And now anyone can take on the very same puzzles that challenge and stump the national and world champions every year. These puzzles are pulled directly from the World Sudoku Championships and U.S. Sudoku Championships and include solving tips from puzzle pros. So grab a pencil and see how you match up against the world¿s best solvers.Holloway, Harry is the author of 'Hardest Sudoku in the World : Puzzles from the World Sudoku Championships', published 1985 under ISBN 9780312654863 and ISBN 0312654863.