Sudoku

Take some time out and sharpen your mind with Puzzles on the Go: SUDOKU and other NUMBER puzzles.
This compact book contains sudoku puzzles ranging from easy to diabolical and a variety of other challenging number puzzles: addoku, binary, futoshiki, jigsaw sudoku, calcudoku, and arrow sudoku puzzles.

It also includes a handy pen so you can enjoy these puzzles anywhere and anytime!