Sudoku puzzles can be played interactively on the computer, offering many features and advantages compared to pencil and paper. This section explains everything about how to play Sudoku Interactive. If you are not yet familiar with the puzzle rules, please go to Sudoku rules.
Placing and deleting numbers (Keyboard: numerical keys)
Sudoku Interactive is played by placing numbers in a grid. Click mouse on the desired square to open dial pad and then click on the desired number. To remove a number, repeat the above using X at the bottom of the dial pad. Numbers can also be placed by pointing mouse on the desired square and then typing with the keyboard.
Using pencilmarks (Keyboard: numerical keys)
Sudoku Interactive also supports pencilmarks to help solve hard puzzles. Click mouse on the desired pencilmark square to open dial pad and then click on the desired number. To remove a pencilmark, repeat the above using X at the bottom of the dial pad. Pencilmarks can also be placed by pointing mouse on the desired pencilmark square and then typing with the keyboard.
Selecting numbers is only needed when the Highlight selected number or the Highlight excluded squares preferences are used. To select a number, click mouse on any square containing the number you want to select. The spacebar and arrow keys may also be used to change the selected number.
All game functions are accessed through the toolbar. For some toolbar buttons, keyboard shortcut keys are also available as listed below. Toolbar may be positioned horizontally or vertically using the rotate button on the left edge, and relocated anywhere in the game by dragging its frame.
Enlarge small puzzles for best viewing on your screen.
Reduce large puzzles for best fit on your screen.
Undo (Keyboard: U)
Go back as many steps in the game as you want.
Redo (Keyboard: R)
Go forward after using Undo as many steps as you want.
Restart puzzle to solve from the beginning.
Check puzzle (Keyboard: C)
Check all placed numbers for errors
Clear all pencilmarks
Clear all pencilmarks placed in the grid.
Show elapsed solving time.
Show solution of the puzzle. Using this button will also end the game.
Open Preferences dialog box. New preferences will be automatically saved on the computer.
Open About dialog box to see puzzle size, difficulty, ID, title and other information.
Open Sudoku Interactive page you are reading now.
Open Print dialog box. New print options will be automatically saved on the computer.
Save puzzle (Keyboard: S)
Save current state of the puzzle.