600 Crazy Sudoku Variants

600 Crazy Sudoku Variants puts ten different Sudoku styles in one book. Each variant adds its own twist to the rules, so just as you master one, the next makes you rethink your approach. It's the series for solvers who love classic Sudoku but want to be surprised.

Every book holds 600 puzzles, and there are three to choose from: Easy to Hard, Medium to Very Hard, and Hard to Extreme. Start low if the variants are new to you; each twist is easier to learn on gentler puzzles before you meet it at full strength.

Because the rules change from variant to variant, the book keeps your thinking flexible. The techniques you rely on in classic Sudoku still help, but each variant asks you to spot something new.

The books are printed at 8.5 x 11 inches. If you'd like variants with simpler extra rules, see 1500 Sudoku Puzzles & Variations, which covers Sudoku X, Windoku, Asterisk and Center Dot. For overlapping grids, try 240 Multi Sudoku in 12 Variants.