Sudoku Free

Complete, easy and intuitive to use Sudoku free game.
All puzzle games are tested and guaranteed to have one and only one solution, they are real sudoku grids.
The most difficult sudoku grids of the Internet are present, only 17 givens and always one solution.
Games are saved and you can resume them later.
Unfinished games are listed in a graphical way and easy to find.
Optimized both for smartphones and tablets.
All grids can be played offline.

* Totally free
* Each sudoku grid has an unique solution
* 5 levels: very easy, easy, medium, hard, evil
* 3 input methods: number first, cell first, popup
* Resume function
* Graphical list of the sudoku puzzle games
* Pencil button to fill in note
* Auto-save
* Total time spent on each sudoku puzzle game
* Undo function
* Checkpoint undo function
* Hints for solving (highlight wrong values, highlight completed numbers and count of each number)
* Edit function to add your custom sudoku puzzle

Credits:
openclipart.org
ciaosudoku.com