Sudoku Instructions

The game of Sudoku is traditionally played within a 9x9 grid. This grid is further divided into sub grids of 3x3 squares.

Sudoku begins with some cells already filled in for you. The object of Sudoku is fairly simple – you must fill each empty cell with a number between 1 and 9, but there are a few rules to bear in mind.

Follow these guidelines:
1. Each horizontal row must contain each number only once.
2. Each vertical column must contain each number only once.
3. Each 3x3 sub grid (or region) must contain each number only once.