Want to workout your brain and relief stress? You got the right place! Sudoku classic puzzle game is want you need. Whether you'd like take a relax or get a small break, volcano sudoku is a good sudoku free puzzle game you can find for low time cost entertainment, it'll help you to learn and improve your sudoku levels, and during the game, your mind gets activated and your brain exercised. With our hint system, it'll teach you all the skills you need to solve the sudoku puzzles step by step, and the instructions are very easy to understand, also with helpful animations and colorful visual effects. The hint system will not only tell you the answer but also help you to understand why the answer is, whether you're completely new to sudoku game, or the way to the expert. Our free sudoku puzzle game comes with ads, but if you want play sudoku no ads, you're always welcome try our Premium Access which you can play sudoku without ads and enjoy much exclusive features. We created this innovative sudoku free game with several various key features: • Sudoku variations such as squiggly, X and Color • 8 difficulty levels from very beginners to the expert • Hint system help you to learn how to solve the sudoku puzzles • Career statistics to keep track of your game progress • You can update your sudoku puzzles from the server at any time, without re-installing the game • Compete with global players in the Champions Challenge and win the bounty • The custom puzzle can let you create your sudoku puzzles as composed by yourself, or from the papers • More than 15000 sudoku free puzzles waiting for you during the game, you will be able to • Auto highlighted numbers for the intelligent hint • Use pencil marks • Double-tap the cell to erase numbers • Use various kind of items, like check the errors • Unlimited redo & undo you can also found more useful functions like • You can share with your friends via Twitter or Facebook • Auto-save, you can pause at any time you like without losing any progress • Use Dark Mode in the night to protect your eyes • Timer, you can also disable it in settings • Selected cell highlighting • Incorrect digits mark • Enchanting visual effects • Various numerals like Chinese number • Universal App looks great on phone and tablet • Give us feedback in the game, with your help we'll make the game better We hope you will enjoy the stunning designs of our good soduku puzzle free of charge, it's a classic brain teaser game that helps to workout your brain! All for FREE!