Enjoy Sudoku Daily
- Free, ad-supported version of Enjoy Sudoku offers 16 difficulty levels updated daily.
- Tutorial and practice puzzles teach Sudoku novices how to play.
- Hints and pencil mode give you as much (or as little) help as you want.
- Higher levels with advanced techniques that go beyond the basics.
- Customization options include color schemes and Kanji and Hanzi digits.