Sudoku is played on a grid of 9 x 9 spaces.
Within the rows and columns are 9 "squares" (made up of 3 x 3 spaces).
Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square.
Keyboard and Mouse Input
Select a square
Move the selected clear
Play that value in the selected square
SHIFT + 1-9
Toggle a guess tick in the selected square
Space, Delete, or Backspace
Clear the value in the selected square
SHIFT + Space
Clear (or Set) all guess ticks in the selected square
Toggle between "Guessing Mode" (playing a value) and "Candidate Mode" (placing a tick mark)
Quit Your Current Game?
Are you sure that you want to quit your current game to start a new game?