Sudoku at FreeOnlineSudokuGames.com lets play classic Sudoku puzzles on a 9x9 grid at no cost to any one who has a computer connected to Internet. This Sudoku game features original controls that allow to play Sudoku on a computer screen uniquely with the mouse: left mouse button is used to place or remove digits, right mouse button is used to place or remove candidates. The game has three difficulty levels - easy, medium and hard - that allow players with any level of experience in this game, whether it be a beginner or an expert, enjoy solving Sudoku puzzles.