What is Sudoku?
Sudoku is an easy to learn logic-based number placement puzzle. The word Sudoku is short for Su-ji wa dokushin ni kagiru which means "the numbers must be single".Sudoku, sometimes spelled Su Doku, is a logic-based placement puzzle, also known as Number Place in the United States. The aim of the canonical puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9x9 grid made up of 3x3 subgrids (called "regions"), starting with various digits given in some cells (the "givens"). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Although first published in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005.

Instructions:
Desktop users may use a keyboard and mouse to enter numbers. Mobile users may use the keypad. Or if you are on the desktop and like clicking a lot, you may also use the keypad.

The Rules of Sudoku
The rules are pretty simple, each row, column and 3x3 square must contain the numbers 1-9 with no duplicates.

Medium and Hard levels may take a few seconds to load.

The classic Sudoku game involves a grid of 81 squares. The grid is divided into nine blocks, each containing nine squares.

• The rules of the game are simple: each of the nine blocks has to contain all the numbers 1-9 within its squares. Each number can only appear once in a row, column or box.
• The difficulty lies in that each vertical nine-square column, or horizontal nine-square line across, within the larger square, must also contain the numbers 1-9, without repetition or omission.
• Every puzzle has just one correct solution.

Internet Explorer:
Internet Explorer may complain about the script taking too long and ask if you want to stop it. You may need to click No several times. I may fix this in a future version (but I doubt it).

The Puzzle Game taking the World By Storm
Put the numbers 1 through 9 into the blank spaces in the grid. Every row, every column, and every 3x3 box must contain the digits 1 through 9. Do you Sudoku?

• No duplicates of the numbers 1-9 horizontally.
• No duplicates of the numbers 1-9 vertically.
• No duplicates of the numbers 1-9 in the 3x3 cell groups Click on a cell and use your keyboard to type in the numbers.