Here you can get a free collection of printable sudoku puzzles that I’ve for friends. The puzzles are contained in small PDF ebooks. At the moment, this page contains 3 sudoku ebooks for anyone that want to print and enjoy them. Each sudoku ebook contains few dozen carefully planned sudoku puzzles of increasing difficulty. Starting from very easy levels on the first book and and going to very hard levels on the last one. You can also get the puzzles of the online 12 Sudoku Challenge in a printable PDF format.