I absolutely believe HangXun Sudoku is the best Sudoku game worldwide, Whether you want to sharpen your mind or relax your heart, you should give this classic Sudoku game a try. More you play, your brain will become more active. During your commute, before you sleep ... enjoy downtime with brain training. google play url ( or visit google play store, and search HangXun Sudoku to download) play.google.com/store/apps/details?id=com.hangxun.sudoku Features 1. Design each puzzle professionally, guarantee high quality of puzzles. 2. 6 difficulty levels of beginner to evil, for both kids and expert. 3. Use hints and checks for puzzles which are too hard. 4. Turn on note mode to make notes as on paper. 5. Daily Sudoku make you compete with global sudoku master. 6. Sudoku barrier with 1500 levels from easy to evil, designed elaborately. 7. Sudoku Editor and Sudoku Solver, create your own Sudoku. 8. Support sunset and midnight themes, make eyes feel more comfortable.