- Challenging Crossword Puzzles For Adults: Medium-Level Puzzles To Challenge Your Brain, Volume 4
- Challenging Crossword Puzzles For Adults: Medium-Level Puzzles To Challenge Your Brain, Volume 4
- Crossword Puzzles For Adults, Volume 6: Medium To High-Level Puzzles That Entertain and Challenge
- Crossword Puzzles For Adults, Volume 3: Medium to High - Level Puzzles That Entertain and Challenge
- Crossword Puzzles For Adults, Volume 5: Medium To High-Level Puzzles That Entertain and Challenge