We have discovered a new thing. Actually it’s quite old. A puzzle with numbers. Sudoku is a big hit in Japan since 1984. Here is the history of Sudoku. You have to fill in the grid so that every row, every column, and every 3×3 box contains the digits 1 through 9.
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There are different difficulties depending on how many digits are already in the box. You can load down some puzzles for free and try them out. Apparently it is very good exercise for rusty brain cells.