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The Logical World of Puzzles: Rules of 'Alphabet Sudoku'
Sudoku Alphabet: 100 traditional puzzles with a twist using letters of the alphabet. Keep your brain active with these highly addictive logic puzzles. Large print with solutions.: House, Lilac: 9781686584565: Amazon.com: Books
Word Sudoku Rules
Easy as ABC by Prasanna Seshadri - The Art of Puzzles | The Art of Puzzles
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Amazon.com: ABC Sudoku: Easy Alphabet Sudoku Puzzle Book | 120 Puzzles with Full Solutions: 9798407894599: Billings, Mitchell R.: Libros