- Developing grip strength
- The Ministry of Quizzes: The ultimate compendium for puzzlers and quiz solvers
- On the Tip of My Tongue: Questions, Facts, Curiosities and Games of a Quizzical Nature
- On the Tip of My Tongue: Questions, Facts, Curiosities, and Games of a Quizzical Nature
- The Ministry of Quizzes: The Ultimate Compendium for Puzzlers and Quiz-solvers