Badass Sudoku, 6 Times the Pain is a collection of 250 puzzles featuring six styles of Sudoku puzzles: Classic, Irregular, Multi, Odd/Even, Diagonal, and Sum. Within each style, there are three levels of difficulty clearly marked on each page Easy, Medium, and Hard. Conceptis Puzzles created these to challenge all levels of players those new to the popular puzzle craze and those who have already become hooked. Badass Sudoku will provide hours of entertainment while testing your skill and strategies.