The New York Times Hardest Crosswords Volume 4: 50 Friday and Saturday Puzzles to Challenge Your Brain

The New York Times Hardest Crosswords Volume 3: 50 Friday and Saturday Puzzles to Challenge Your Brain

The New York Times Hardest Crosswords Volume 2: 50 Friday and Saturday Puzzles to Challenge Your Brain

The New York Times Hardest Crosswords Volume 5: 50 Friday and Saturday Puzzles to Challenge Your Brain

The New York Times Hardest Crosswords Volume 1: 50 Friday and Saturday Puzzles to Challenge Your Brain

The New York Times Greatest Hits of Saturday Crossword Puzzles: 100 Hard Puzzles

Devilishly Hard Fireball Crosswords: 45 Ultra-Tough Puzzles

The New York Times Greatest Hits of Friday Crossword Puzzles: 100 Hard Puzzles

The Wall Street Journal Blue-Chip Sunday Crosswords: 72 AAA-Rated Puzzles (Wall Street Journal Crosswords)