The object of Sudoku puzzles is to place the numerals 1 through 9 in a 9 x 9 grid so that each row, each column and each 3 x 3 grid contains each number one time only. You can take a look at the solutions to get the idea if you are new to Sudoku puzzles. Options available: • 400 puzzles with 4 difficulty levels • Save incomplete puzzles • Hints • Check for incorrect numbers or check entire puzzle • Restart puzzle • Solve puzzle • Choice of background, number and highlight colors • Eight puzzles in the trial version; 400 in the full version • Free updates (more puzzles as they become available) • Complete help file A comprehensive Sudoku game for Pocket PC.