Super Sudoku Challenge 2 16x16 by Martin Duval (2018, Trade Paperback) for sale online | eBay
16X16 Sudoku Puzzle Book for Adults: Stocking Stuffers For Men: The Must Have 2020 Sudoku Puzzles: Super Sudoku Puzzles Holiday Gifts And Sudoku Stock (Large Print / Paperback) | Changing Hands Bookstore