As convenient as it is stylish and as enjoyable as it is fashionable, the Pocket Posh Killer Sudoku puzzle book features a cover with a contemporary tactile design and comes in a handy 4" x 6" size, making it a smart, sophisticated accessory that goes with anything. It also fits nicely into a purse or pocket. The Pocket Posh Killer Sudoku puzzle book is a great way to exercise your mind--and look great while doing it!