Books
Here appears some of the many books on sudoku that are publishing all over the terrestrial crust.
- Sudoku, the game that stimulates the mind
- Sudokus 1, the best Eastern enigmass
- Sudokus 2, the best Eastern enigmas
- the Best Sudokus
- Su Doku for Dummies
- The Official Book of Sudoku
- Sudoku Easy to Hard
- 200 Difficult Sudoku Puzzles
Newspapers Puzzles
Here appears connections of some of the periodic ones in their version online that have sudokus to solve.
- The Guardian (UK)
- The Times (UK)
- The Hindu (India)
- USA Today
- Cambridge Evening News (UK)
- derStandard (Austria)
- The Daily Mail (UK)
Electronic Books
Sudokus in format pdf. Easy, hard imposible... at downloads section there are a lot of them.
Easy level:
These are puzzles but faciles. If these beginning you do these.
Book 1
Book 2
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Book 4
Book 5
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Intermediate level:
These puzzles is solved using logic simple. They do not contain redundantes tracks like easy puzzles.
Book 1
Book 2
Book 3
Book 4
Book 5
Book 6
Book 7
Book 8
Book 9
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Hard level:
These puzzles contain some squares whose solution is not immediately obvious.
Book 1
Book 2
Book 3
Book 4
Book 5
Book 6
Book 7
Book 8
Book 9
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Profesional level:
it requires logic outpost like X-Wing and Swordfish.
Book 1
Book 2
Book 3
Book 4
Book 5
Book 6
Book 7
Book 8
Book 9
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Professional Super level:
it requires strategies outposts.
Book 1
Book 2
Book 3
Book 4
Book 5
Book 6
Book 7
Book 8
Book 9
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Links and information from http://krazydad.com/sudoku/
