Sudoku Epic is a Mac version of the famous game, sudoku.
You can generate puzzles in sizes from 4x4 to 16x16 and difficulties from very easy to very hard. The Assistant can help you with scanning, markup and revealing certain numbers, allowing you to focus on the logic.
You can also enter puzzles from newspapers and solve them, or see the solution. Additionally you can store puzzles and continue solving them at a later time.