Play Free Sudoku Online

Play standard 9x9 Sudoku in your browser, with no sign-up required. Choose a difficulty, select a cell, and enter a number. Use Notes to keep track of candidates, request a Hint when you need help, or pause the timer and return later.

Choose Your Difficulty

Start with Easy or Medium, try Hard, or work through Expert, Master, and Extreme. The six levels use the same 9x9 board; choose one that suits the kind of session you want.

Make Your Next Move

Start with rows, columns, or boxes that have few empty cells. Add candidate notes when the next number is not obvious, and check intersecting units after each placement. Look for a reason to place a number rather than guessing. For the complete rules and worked examples, visit the Sudoku rules and technique tutorials.

Daily Puzzles and Sudoku Tools

• Daily Sudoku: play the daily puzzle, or choose a past date from the challenge calendar.
• Sudoku Solver: enter a separate standard 9x9 puzzle to check its complete answer.
• Printable Sudoku: download PDF worksheets for paper-and-pencil play.