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More than 200 of the most difficult number puzzles

The World's Toughest Puzzles from the World's Smartest Organization

Twenty IQ Tests From The Masters of Intelligence

Over 350 puzzles to challenge your mental fitness

Increase your self-knowledge with hundreds of quizzes

A series of tests and tips to transform your puzzle scores

Practical exercises to help unleash your full puzzle potential

Over 400 puzzles of deduction and logical thinking

Test your aptitude for deduction and examine your IQ with over 200 puzzles

Enhance your journey with more than 150 puzzles

Test Your Knowledge Against the Highest IQs in the World

Challenge your brainpower with over 200 formidable puzzles

Challenge Your Powers of Deduction and Logical Thinking

Test your word power with more than 100 puzzles

Put your logical reasoning to the test with more than 200 tricky puzzles to solve

More than 150 brainteasers to test your powers of deduction

Test your powers of reasoning with exacting enigmas

Tricky puzzles to challenge every angle

Mind-bending games and puzzles