X-Sudoku play online

The well known game sudoku in new variants:

* classic sudoku
* x-sudoku
* symbol sudoku (play with symbols instead of numbers)
* viking runes sudoku (play with viking runes instead of numbers)
* chinese numbers sudoku

Features:
* collect trophies
* Undo
* Hint (mark wrong cells)
* Easy (without guessing)
* Hard (with guessing - but unique solution)
* Extended selection
* Unlimited amout of puzzles - unlimited fun
* Autosave