This is the number one Sudoku app in Brain & Puzzle for a good reason! You wont be looking for a paper puzzle ever again! With 5 difficulty levels, intuitive interface, and all the functions right at your fingertips, this Sudoku app is sure to be your favorite. Interrupted? Exit Sudoku, and the puzzle is saved exactly as you see it! * Unlimited puzzles * 5 levels - easy, medium, hard, expert, insane * Pencil marks * Auto-save * Local and Online Leaderboards * Statistics tracking, including fastest times, average times and completion % for each level.