- Everything Test Your I.Q. Book: Discover Your True Intelligence (Everything Series)
- What's Your IQ?; Self-scoring Tests . Etc.
- The Mammoth Book of Codeword Puzzles
- The Big Book of Bathroom Brain-Sharpeners: Entertaining Sudoku, Kakuro, and Brainteasers for Every Day (Little Bathroom Book)
- The Mammoth Book of Sudoku
















