This game is similar to sudoku, except that there are
extra 3x3 regions where the numbers must not repeat.
In this game there is a grid of 9 x 9 squares, you
need to fill in each square with numbers 1 - 9 so that
the numbers in each row or column or each 3 x 3 group
(the 9 groups surrounded by thick lines plus the 4
groups with dark background) do not repeat. The faster
you finish the game, the higher your score. Click the
hint button when you are stuck, but you will suffer a
time penalty when you do so.

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