Features
The timer keeps track of your puzzle completion time.
Challenge a friend: When you have completed the puzzle you can challenge a friend to beat your time.
Pencil in: You can 'pencil in' possibilites by entering more than one number in a cell.
Greyed out: Double click a square to turn it grey, use this as a visual reminder if you are unsure of a number.
How to play: Simply fill in the grid above so that every row, every column and every 3x3 grid contains the digits 1 through 9.
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