Open Sudoku is an open source Sudoku game. Features: - Without ads (we hate it as much as you) - Puzzles can be downloaded from web, entered by hand or generated on project's homepage - Game stats (time spent, mistakes) - Next step hints with multiple strategies suggestions () - Import and export from/to a file - Visual themes including custom theme editor - Several input modes (finger-friendly numpad, popup, keyboard etc.) - Double pencil marks and more. Go to http://opensudoku.moire.org for more information.