This Sudoku app is a little android relaxing game designed for you to pass your free time in a pleasant way! With your smart phone, you can play it anywhere, anytime for fun. As a logic puzzle, Sudoku is also an excellent brain game.Our Sudoku game has four levels for you such as easy, moderate, hard and challenge level. No matter which level you choose, if you play it daily, you will soon start to see improvements in your concentration and overall brain power. Our Sudoku game is well designed some features to make it easier for you: hints, undo, redo, auto-check, and highlight duplicates. You can use them in an easy way or complete the challenge yourself. Features► Unlimited Undo and Redo. You can put it back and when you make a mistake. You can also redo it as you like. ► Hints. Hints can guide you through the points when you are in trouble.► Auto-Check. When you step in a wrong way, it will figure out your mistakes with colors and lines.► Notes. If you turn on notes (pencil icon), you can make notes in a cell for your thinking in the next step and notes will be automatically updated.► Highlight duplicates to avoid repeating numbers in a row, column and block► Statistics. Record the games you played. You can track your top scores, history, time used and other achievements.► Auto-save. If you leave Sudoku unfinished, all your work will be saved. You can continue playing it anytime.► Highlighting of a row, column, and box related to the selected cell.► Trash-can. You can delete your mistakes and throw them in the trash can.Highlights✔ More than 5,000 well-formed puzzles✔ 6x6, 9x9, 12X12 grid✔ 4 perfectly balanced levels of difficulty: easy, moderate, hard, and challenge✔ Simple and intuitive designEnjoy the game and give the brain a relaxing training anywhere, anytime!