Why play Sudoku when you can do other stuff?

As a form of mental exercise, playing Sudoku is very beneficial to your brain and may help prevent Alzheimer's. Plus, it is easy to learn, fun to play, and can be entertaining, addicting, and time-consuming.

How to play

All cells must be filled with a number from 1 to 9. For each cell, a number can only be used once in the same row, column, and minigrid. The whole puzzle is composed of 9 minigrids (3 along the row and 3 along the column). An individual minigrid is a square area with 9 cells (3 rows by 3 columns). After the puzzle is solved, each minigrid must contain every number from 1 to 9. Same for each row and each column.

Let's play Sudoku online

No download is neccessary for you to play and learn Sudoku of different sizes (default: 3x3, advanced: 5x5) on your browser. Written in Javascript and JQuery, the following program can run on most browsers and solve any Sudoku puzzle.

To play the following online program, start a new puzzle by clicking the 'NEW' button and enter valid numbers in the entry boxes.

If you don't know how to play Sudoku yet, here is the simple rule. In addition, you could learn some of the techniques to help you solve Sudoku puzzles.

Play Sudoku online here. It runs on a compatible browser with Javascript enabled. Download or plugin (e.g., Adobe Flash) NOT required.

Browsers supported:

 browsers supported
(Chrome 10+, Firefox 3.6+, Opera 10+, Safari 5+, IE9+)

Download & Play Sudoku offline

You may download the following Windows program and play offline on your computer. It generates random Sudoku puzzle for you locally — without going online at all. Written in C#, it can solve any puzzle and show/hide candidates to help you solve the puzzle. The candidate lists can be easily edited.

  1. Requires .NET Framework 4.0 or higher — no download neccessary for latest Windows.
  2. Multi-threaded: Solves puzzles by running threads in parallel. Each thread is independent, improving the speed significantly.
  3. Size of the puzzle can be set to 2x2, 3x3, 4x4, and 5x5.
  4. No malware, virus, and etc.

Download Play Sudoku program

Download Sudoku Program

Older Versions:

  • v2.0 — requires .NET Framework 4.0+.
  • v1.1 — requires .NET Framework 1.0+.