Sudoku : Brain-teaser is a logic-based, combinatorial number puzzle game. This game is the best way to learn and improve your skills in this classic puzzle game. With our Sudoku app, not only will you play a beautiful user-friendly Sudoku, but you’ll also have access to the world’s most friendly and complete mobile Sudoku learning system. Objective : Fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids that compose the grid contains all of the digits from 1 to 9. Features: 4 difficulty levels. More than 1000 brain teasing puzzles. Pencil marks (a.k.a. Notes) Phones and tablets support Clean interface and smooth controls. Automatic error detection: show errors automatically Our input system is designed to make entering solutions and notes magically simple that allows you to compete with yourself at skill level. Enjoy a clear, easy to read, and customizable Sudoku board with visual guides that make glancing at the possibilities a breeze. We hope you'll enjoy this game.