books by subject
Brain Teaser Games
Examinate: A Doctor Who Quiz Book
Optical Illusions: The Science of Visual Perception (Illusion Works)
What's the Story?
Patterns of the Universe: A Coloring Adventure in Math and Beauty
The Ultimate Brain Health Puzzle Book for Adults: Crosswords, Sudoku, Cryptograms, Word Searches, and More!
The Kids’ Book of Christmas Wordsearches (Buster Puzzle Books)
Are There Rainbows on the Moon?: Over 200 Bizarre, Weird and Wonderful Puzzles with Science
The Medieval Puzzle Collection: A Fine Perplexing Tome of Riddles, Enigmas and Conundrums
Lateral Thinking Puzzles & Paradoxes: More than 90 brainteasers to solve with logical reasoning
Sherlock Holmes' Cunning Puzzles (Puzzle Books)
Fast Brain Workouts: Exercises, tests & puzzles to keep your brain super-fit
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
