When you fire up Sukoku Gridmaster, it doesn't take long to figure out it's a game for all players of all skills. That's why it's part of the Touch Generations brand of games. Entering numbers for each puzzle is as simple as tapping a square on the sudoku grid and then tapping a number on the 1-9 keypad on the right hand side of the screen. If you'd rather write the number in, you can change to this setting which replaces the keypad with a blank area in which you can write your number. * Intuitive touch-screen controls that make solving the puzzles faster and easier than ever. * More than 4000 sudoku puzzles, all of which were hand-picked by the sudoku masters at Nikoli.