- The Mammoth Book of Sudoku: 400 New Puzzles - The Biggest and Best Collection of Sudoku Ever
- The Mammoth Book of Codeword Puzzles
- Everything Test Your I.Q. Book: Discover Your True Intelligence (Everything Series)
- What's Your IQ?; Self-scoring Tests . Etc.
- 60-Second Brain Teasers Pencil-Free Puzzles: Short Head-Scratchers from the Easy to Near Impossible