A sudoku game you can play in the terminal.
The object of the game is to fill in each open square so that each of the digits 1-9 occurs once in each row and column.
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Download the folder from github and extract the folder.
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Open your terminal, navigate to the sudoku folder, then enter:
ruby sudoku.rb
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Type in the row, column and value for the square you would like to fill in.
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Continue to fill in squares until no empty squares remain.