SBY is a PC-based Sudoku program that far exceeds the functionality of the typical puzzle-solving program. It not only comes with hundreds of puzzles and an electronic work sheet for solving, but also (1) includes a database for adding new puzzles; (2) supports the printing of large solving grids with a built-in Options Grid; (3) introduces a revolutionary “degree of difficulty” rating system; (4) supports the importing and exporting of puzzles;...
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This download (Sudoku Puzzle) is shareware. "Shareware is a marketing method for computer software. Shareware software is typically obtained free of charge, either by downloading from the Internet or on magazine cover-disks. A user tries out the program, and thus shareware has also been known as "try before you buy". A shareware program is accompanied by a request for payment, and the software's distribution license often requires such a payment." More info at
Wikipedia.
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