Here you see some more assistance in playing.
The Two check boxes was previously discussed. Click on then to toggle
If you press the Solve button the program will internally find the solution.
If you press the Original button the program will reset the board to the beginning.
If you press the Hint Button the hint system will be entered.
Hints will colour bookmarks and cells depending on what hint it activated. Hints can be cleared by pressing the Clear Hints button