Play 6000 free Sudoku puzzles from Easy to Expert, fast and fluid Gameplay, great solving tools. Take advantage of the great tools we created to help you solve the hardest Sudoku. Clean and simple classical Sudoku Game, free for you to use. Pure Sudoku. Enjoy. KEY FEATURES: 6000 puzzles. 4 difficulty levels. 40 Sudoku Books. Timer. Auto-Save.