The Sudoku Master CD for PC contains 600 unique puzzles in English language. It is compatible with Windows, Mac operating systems, and requires a minimum of 64 MB of RAM and less than 50 MB of hard drive space. The CD format allows for easy access to the puzzles, making it a fun and engaging hobby for leisure time. With the factory seal intact, this product offers hours of entertainment for Sudoku enthusiasts looking for a new challenge.