- Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9.
- The digits 1-9 must appear once in each row, once in each column and once in each 3x3 box.
- There is only one correct answer to the whole puzzle.
- Controls are as follows:
- Create: creates a new initial configuration.
- Clear: clears the board so that you can enter a puzzle taken from elsewhere.
- Lock: locks the initial configuration so that you don't change it accidentally.
- Reset: resets the board to the initial configuration.
- Hint: makes suggestions for cells you might like to study - the program thinks that the correct digit for this cell is easy to find.
- Solve: displays the full solution, but only if you press and hold the key down!
- The darker coloured cell is the "current" cell. Pressing a numeric key or one of the numbered buttons
on the right will enter a number in that cell. Click on a cell with the mouse, or use the cursor keys
to change the current cell. The program prevents you from entering obviously incorrect answers, and plays a beep.
However it will let you enter wrong answers that still fit with the visible digits. You can clear a single cell by pressing the space bar.
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