Difficult Puzzle Book for Smart Kids: Over 300 Brain Games for Kids Aged 11 - 14 (Thinking Books for Kids)

Difficult Puzzle Book for Smart Kids: Over 300 Brain Games for Kids Aged 11 - 14 (Thinking Books for Kids)

Difficult Riddles For Smart Kids: 300 Difficult Riddles And Brain Teasers Families Will Love (Thinking Books for Kids)

Math Riddles For Smart Kids: Math Riddles And Brain Teasers That Kids And Families Will love (Thinking Books for Kids)