If you are a fan of sudoku games, you'll love this. There are three levels of difficulty and is incredibly easy to play. Play all the time without getting bored with the ease of thousands of sudokus. Prove yourself in this easy and relaxing solitaire game. For each number that you hit correctly, you'll see it as green, and for each number that you fail, you'll see it as red. The sudoku puzzle consists of a grid of 9 blocks. Each column must contain all of the numbers 1 through 9 and no two numbers in the same column can be the same. Each row must contain all of the numbers 1 through 9 and no two numbers in the same row can be repeated. Each block must contain all of the numbers 1 through 9 and no two numbers in the same block puzzle can be duplicated. This is the secret of one of the puzzle most played around the world.