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Introduction to Online SuDoKu
These words are taken from
this Wikipedia page.
The puzzle is most frequently a 9x9 grid made up of 3x3 subgrids (called "regions").
Some cells already contain numbers, known as "givens". The goal is to fill in the empty cells,
one number in each, so that each column, row, and region contains the numbers 1-9 exactly once.
Each number in the solution therefore occurs only once in each of three "directions", hence the
"single numbers" implied by the puzzle's name.
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Completing a sudoku puzzle can be tough, but the rules are very simple.
Sudoku is made of nine by nine squares that are subdivided into a three by three set of squares. To solve a sudoku puzzle, enter a number from 1 through 9 in each square, so that:
Each row across contains each number only once.
Each column up and down only contains each number once.
Each subdivision only contains each number once.
The Japanese name, sudoku can be roughly translated "numbers singly".
You cannot change the given numbers. They are arranged to have only one solution to the puzzle (in a good sudoku puzzle).
Sudoku can be extremely addictive. Sudoku became really popular in 2005. There are books upon books of sudoku puzzles.
If you can't spell, notice its free sudoku, not free soduko, free suduku, or free sodoko.
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