1500 Sudoku Puzzles & Variations

1500 Sudoku Puzzles & Variations packs 1,500 puzzles into each book: classic Sudoku plus four clever twists. Sudoku X, Windoku, Asterisk and Center Dot each add one extra rule to the familiar game, so you get plenty of variety without having to learn anything complicated.

Sudoku X adds the two long diagonals, which must also hold the numbers 1 to 9. Windoku adds four extra shaded boxes with the same rule. Asterisk and Center Dot each add a set of nine highlighted squares that must contain 1 to 9 as well. Each extra rule changes where the logic leads, so the techniques you know take you in new directions.

There are three books: Easy to Hard, Medium to Very Hard, and Hard to Extreme. With 1,500 puzzles in each, a single book gives you months of solving.

The books are printed at 8.5 x 11 inches. If you enjoy the variants, 600 Crazy Sudoku Variants offers ten more styles, and 180 Pocket Sudoku Variations puts Sudoku X and Windoku in a travel-friendly size.