This is an e-book based on the very popular numbers puzzle game called sudoku and it contains 120 sudoku puzzles in five levels of difficulty, from beginner to expert. This e-book is produced by Multibizlink, an Alliance Technology Partner of Corel Corp, which specializes in developing standardized and customized application software for leisure, personal finance, and small to medium sized companies use on Corel Quattro Pro and Microsoft Excel.These puzzles are in Adobe Acrobat Reader (.pdf) file format and are delivered to you compressed using WinZip. To play you just need to unzip the file and print the puzzles and solve them with a pen or pencil. Print many copies of the puzzles and challenge your family and friends to a sudoku challenge. Version 1a may include unspecified updates, enhancements, and bug fixes.