Super Sudoku

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! Features: * 5 difficulty levels * 3 input modes: "Digit first", "Cell first", popup * Pencil marks (a.k.a. Notes) with auto fill / erase option * Selected digit and various other highlighting options * Show digit counts option * Auto-save * Unlimited Undo and Redo * Intelligent hints that use only logic * Two levels of automatic error checking option * Submit results and track progress online * Top scores and History * Real time competitions Sudoku supports trackball, touch screen, keyboard.