Free Sudoku is an extension of the great Andoku, offering the same cool features and game variations:
• Standard Sudoku
• Squiggly Sudoku
The Free Sudoku extension includes 15000 new puzzles, App to SD, and a new Sudoku Strategy Tutorial, which will help you learn how to solve from the easiest puzzles for beginners to the Fiendish puzzles for advanced users.
Finally, the Interface has also been enhanced, solving a popular demand... now you can enter pencil marks with just one digit. Something many advanced users requested in previous versions of this awesome game.
This game is completely free, and will eventually be supported by unobtrusive adds.