Sudoku Rules

The Rules of Sudoku

There are just 3 rules to Sudoku.

Rule Number 1
Each row must have the numbers 1-9 occuring just once.

Sudoku Rules - Row

Rule Number 2
Each column must have the numbers 1-9 occuring just once.

Sudoku Rules - Columns

Rule Number 3
And the numbers 1-9 must occur just once in each of the 3x3 sub-boxes of the grid.

Sudoku Rules - Grid