Petite Hard Sudoku

Sudoku that's easy to carry--but tough to solve! If you like to do your puzzle-solving on the go, the portable Petite Hard Sudoku is the ticket. Sudoku master Frank Longo has crafted 106 mind-melting conundrums that all require upper-level solving techniques to conquer. So grab a pencil--or pen, if you dare!--and give your brain a workout.