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.
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
To play the following online program, start a new puzzle by clicking the 'NEW' button and enter valid numbers in the entry boxes.
(Chrome 10+, Firefox 3.6+, Opera 10+, Safari 5+, IE9+)
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.
- Requires .NET Framework 4.0 or higher — no download neccessary for latest Windows.
- Multi-threaded: Solves puzzles by running threads in parallel. Each thread is independent, improving the speed significantly.
- Size of the puzzle can be set to 2x2, 3x3, 4x4, and 5x5.
- No malware, virus, and etc.