Sudoku Help - Keyboard
Our menu and toolbar page lists all the Sudoku playing commands that are available from the program menu and toolbar. All the most frequently available actions are also available at the touch of a button - from the keyboard.
Selecting a square
To select the Sudoku grid press TAB until one of the cells shows a flashing underline. You can also select a square by clicking the mouse on a square.
Moving around the grid
The arrow keys (up, down, left and right) move by one Sudoku square in the corresponding direction. These only operate when a grid square is already selected. The page keys (Page up, Page down) move by one region up or down. If you use the control CTRL key at the same time it will move horizontally by a region rather than vertically. Home takes you to the top left square and End takes you to the bottom right.
Setting the contents of a square
To set the value for a Sudoku square you must first select the square then just use the appropriate key '1' to '9'. If you have Number lock (Num Lock) enabled you can assign a value with the number pad keys. You can also use the mouse wheel as an alternative way of allocating a value to a square.
Clearing the contents of a square
Use the Delete key or Space to set the currently selected square as unallocated again.
Setting Tentative Possibilities and Impossibilities
For more difficult puzzles, many Sudoku puzzlers will want to mark possibilities on squares. You can do this simply and easily by selecting an unallocated square and then pressing down control SHIFT key at the same time select the appropriate key '1' to '9' for the possibility you want to set. The possibilities are shown as small numbers (or letters) at the bottom of the square. To set a tentative impossibility use the CTRL key at the same time and the number will be shown with reversed colors. To clear all the tentative possibilities for a square press Delete. You can set all tentative possibilities to be the same as the automatic possibilities by pressing F8 or Edit | Set Auto Possibilities. The setting of tentative possibilities is remembered so the program can selectively Undo and Redo them if you find you need to change your mind later.
Showing Possibility Analysis
The possibility bar lets you quickly show what is possible to assign and where. You can use it by clicking on the symbols in the toolbar or by using ALT key with a number '1' to '9' to select a possibility option. If the possibility is already chosen this will clear the possibility display. To switch on all possibilities use the F4 function key. A highlight option is provided that shows the number of squares remaining.
Here are all the available keyboard commands :
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