To start playing head-to-head Sudoku, simply use your Facebook login, or Sign Up for a new account with us.

After Signing In, go to Start A New Sudoku Race and invite other players to join and play.

You can invite other players using email, or search through your Facebook friends and send an invitation to join the race.

Games and statuses against your fellow racers will show up in the home view. Notifications will alert you when you have been challenged to a Sudoku Race.

While playing Sudoku, check your progress against your opponent, use the Eraser to fix a mistake, Clear the puzzle board entirely, or Give Up the game if necessary.