BridgeDoku Puzzles: 100 one-player logic puzzles for adults, combining bridge and sudoku: Media, Clarity: 9798633704105: Amazon.com: Books
Pocket Posh New York Sudoku: 100 Puzzles: The Puzzle Society: 0050837304697: Amazon.com: Books
Hyper Sudoku ○○○○○: 100 Very Hard Puzzles: Ritmeester, Peter: 9781076847942: Amazon.com: Books
Mixed Puzzle Activity Book for Adults: Sudoku, Word Search, Mazes, Word Puzzle, Mines Finder And More... (UK Version), Vol2: Edition, Agenda Book: 9798716442658: Amazon.com: Books