from Luigi Fonti, originally released 18th November, 2010
NumberGrid is a board game, somehow similar to Sudoku.
You have a 6x6 grid. Each cell contains a number, 0 to 9; some of them are shown, some other are hidden.
On the right of each row, and at the bottom of each column, the sum is shown of all the elements of that row, or colum...
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