Even more interactionthis time used in combination withother proceduresand a lot more heavily than in the firstbook.

About the Author

Frank Longo creates, fact-checks, and editscrossword puzzles, and also specializes in sudoku, having published more than150 sudoku books. His books have sold more than 5 million copies. His widearray of titles encompasses both standard and variety sudoku puzzles, andincludes Beyond Black Belt Sudoku, Way Beyond Black BeltSudoku, The Nastiest Sudoku Book Ever, Pause for Puzzles: Sudoku forMindfulness, Sip & Solve Simple Sudoku, Blockbuster Book ofSudoku, Puzzlewright Guide to Solving Sudoku (with Peter Gordon),and Skill Builder Sudoku (with Peter Gordon).