Adult puzzles. Big Samurai and Calcudoku 9x9 Sudoku. Medium - hard levels.: Very large font. (Sudoku and large size puzzles): Holmes, Basford: 9781078413671: Amazon.com: Books
Adult sudoku jigsaw Killer. Calcudoku puzzles. Medium levels.: Fitnes brain sudoku. (Paperback) | Third Place Books
1,000 + Calcudoku sudoku 7x7: Logic puzzles medium - hard levels (Sudoku CalcuDoku): Holmes, Basford: 9781677799732: Amazon.com: Books
Adult sudoku jigsaw Killer. Calcudoku puzzles. Hard levels.: Brain sudoku. (Killer sudoku and his friends): Holmes, Basford: 9781082010347: Amazon.com: Books