Sudoku is a puzzle with a grid containing nine large blocks. Each block is divided into its own matrix of nine cells. The rules for solving Sudoku puzzles are very simple: each row, column and block must contain one of the numbers from "1" to "9". No number may appear more than once in any row, column, or block. When you've filled the entire grid, the puzzle is solved.
Daily Challenge - See how you compare to others.
Points Challenge - Solve the same puzzle simultaneously with others and score as many points as possible.
Sudoku Multi - Solve the same puzzle against others simultaneously. Winner is first to complete the puzzle.
Watch the pros solve puzzles - replay winning games from Sudoku Points.
Forum - Post comments, tips and tricks.
New! Killer Sudoku is now available. Give this Sudoku derivative a go.
Play online on your iPhone, iPad or Android phone.
Personal statistics are recorded for users that have registered. This includes a Rank Index which is the average of the last 12 scores discarding the highest and lowest. Your stats will be shown whenever you complete a puzzle which records a score. If you have not registered yet, join now for free.