Fuel your obsession for sudoku with the new electronic touch screen handheld from Techno Source! This pocket sized phenomenon puts over 100,000 puzzles in the palm of your hand and eliminates hours of endless erasing through your newspaper! Simply fill in the grid so that every row, column and 3 x 3 box contains the number 1 through 9. With both beginner and advanced modes, anyone can learn to master the ultimate logic puzzle! Over 100,000 puzzles in the palm of your hand! No more erasing right through your newspaper! Built-in tutorial training mode! Beginner and Advanced modes! Pocket sized and fully portable! The rules are simple and math is not required. Complete the grid so that every row, colum and 3 x 3 box contains the numbers 1 through 9.