835 Sudoku puzzles in the palm of your hand

ThinkGeek, Brookstone and others are now selling a touch screen Sudoku handheld for about $20. The Excalibur Electronics device is filled with Sudoku puzzles chosen by legendary New York Times crossword editor Will Shortz.

(Credit: ThinkGeek)

For those of you unfamiliar with the brain game, Sudoku consists of an 81 square, nine-by-nine grid pre-filled with a few numbers. The player fills in the remaining squares by determining what number each square needs in order to create a balance of numbers 1 through 9 for each row, column and nine-square block. (The game can also be played with nine shapes.)

The New York Times Touch Screen Sudoku Handheld takes 2 AAA batteries and holds 835 puzzles, including a timer and optional hints feature.