Gym For The Brain: 300 Riddles For Adults To Workout Their Mind Using Reason And Lateral Thinking (Paperback)

Riddles For Adults : Flexible And Challenging Tasks In The Fields Of Logic, Maths, Geometry And Textriddles (Paperback)

200 Challenging Riddles Brain Teasers For Geniuses Volume IV - English Edition, Humorous & Thought-Provoking Puzzles For Mind Sharpening, Published

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101 Lateral Thinking Puzzles: The Best Logic Games And Riddles Book For Seniors And Adults, (Paperback)

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