1. The game is played on a grid that's 3 squares by 3 squares.
2. You are X, your friend (or the computer in this case) is O. Players take turns putting their marks in empty squares.
3. The first player to get 3 of her marks in a row (up, down, across, or diagonally) is the winner.
4. When all 9 squares are full, the game is over. If no player has 3 marks in a row, the game ends in a tie.
The purpose of the game is to open all the cells of the board which do not contain a bomb. You lose if you set off a bomb cell.
The goal of sudoku is simple: fill in the numbers 1-9 exactly once in every row, column, and 3x3 region.
