Puzzle hard

The Crossword Puzzler's Dictionary Crossword 150+ Hard Puzzles to Solve! av Puzzle Therapist (Paperback)

The New York Times Large-Print Crossword Puzzle Omnibus Volume 13: 120 Large-Print Easy to Hard Puzzles from the Pages of The New York Times (New York Times Crossword Omnibus) av The New York Times (Paperback)

Sudoku Puzzle Book, 600 EXTRA HARD Puzzles