Sudoku Susser is a comprehensive Sudoku assistant and master-level solver. Hints mode shows you what numbers are legal for unsolved squares. The Deducer uses human-style reasoning to solve the puzzles and can take you step-by-step through their solution. Tons of hilighting modes help you see the patterns in the puzzles. You can even drag puzzles right off web-pages into the application, then edit, save and print them for offline fun.