100 Sudoku Puzzles : 25 Easy - 25 Medium - 25 Hard - 25 Very Hard with Solutions Included (Paperback) - Walmart.com
Sudoku Puzzles - 25 - CreateMeow
Color Me Sudoku: 25 Easy and 25 Medium Large Print Sudoku Puzzles with 25 G... 9781541374188 | eBay
IES . The Mammoth Book of New Sudoku: Over 25 different types of Sudoku, including Jigsaw Sudoku, Killer Sudoku, Skyscraper Sudoku, Sudoku-X and multi-grid Samurai Sudoku