Featuring 400 new puzzles this is the biggest & best collection of Sudoku ever. Here is the biggest & most varied book of Sudoku puzzles ever compiled. Over 400 painstakingly prepared puzzles designed to satisfy all levels from beginner to expert. The Mammoth Book of Sudoku" contains more challenges more levels of difficulty & more varieties of number-placement (and letter-placement) puzzles than any other collection available including: huge array of easy to diabolically-difficult classic grids; monster Sudoku
- multiple overlapping grids; secretly encoded alphabetical wordoku; liquid crystal Sudoku; & bonus kakro puzzles. It also contains full step-by-step instructions tips & killer strategies from the founder of the International High IQ Society & confirmed Sudoku addict Nathan Haselbauer."