books by subject
Brain Teaser Games
Bletchley Park Braintraining Puzzles (Bletchley Park Puzzles, 4)
Rubik's Puzzles: 100 Puzzles to Test Your Brain Power (Puzzle Books)
Bletchley Park Codebreaking Puzzles (Bletchley Park Puzzles)
How Big is Your Brain?
The Great Book of Brainteasers
The 10-Minute Brain Workout
How to think like Sherlock
Cracking Mathematics: You, this book and 4,000 years of theories
Ultimate Sudoku (Puzzle Books)
The Mammoth Book of Brain Workouts (Mammoth Book of)
Duck That Won the Lottery
Brain-training: Difficult 2 (Brain Training Puzzles)
Lateral Thinking Puzzles
Braintraining Puzzles
Who am I? A Book of Riddles
Kakuro Challenge (Mini Index Boards)
Are You Smart Enough to Work at Google?: Fiendish Puzzles and Impossible Interview Questions from the World's Top Companies
Are You Smart Enough to Work at Google?: Fiendish Puzzles And Impossible Interview Questions From The World'S Top Companies: Fiendish Interview Questions and Puzzles from the World’s Top Companies
What's Your Friend's IQ?
The Chicken from Minsk: And 99 Other Infuriating Brainteasers
Mensa Number Puzzles
Rubik's Puzzles (Puzzle Books)
Super Sudoku
Mindbenders and Brainteasers: 100 Maddening Mindbenders and Curious Conundrums: Where Maths Meets Creative Thinking
Mind-Bending Conundrums and Puzzles (Mind Bending Puzzle Books)
Mind-Bending Lateral Thinking Puzzles
More Mind-bending Lateral Thinking Puzzles: v. 2
Mind-Bending Lateral Thinking Puzzles
Five-minute Crime Lateral Thinking Puzzles (Puzzles Books)
