Computer Generated Puzzle
The program can generate an innumerable number of puzzles with symmetrical exposed cells. There may, however, be more than one solution. The batch files (about 50 puzzles in number) uploaded each month to the home page are generated as above but 'doctored' a bit to have an unique solution.
The generated puzzle would look like this. The timer would start immediately to clock the time taken to solve the puzzle.
The puzzles generated are automatically added to the database of puzzles according to the difficulty level.