1000+ Sudoku Puzzles for Adults: A Book With More Than 1000 Sudoku Puzzles from Easy to Hard for adults.

My First Logic Workbook for Gritty Kids: Spatial Reasoning, Math Puzzles, Logic Problems, Focus Activities. (Develop Problem Solving, Critical Thinking, Analytical & STEM Skills in Kids Ages 4, 5, 6.)

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

The Moscow Puzzles: 359 Mathematical Recreations (Dover Math Games & Puzzles)

The Hardest Logic Workbook for Gritty Kids: Spatial Reasoning, Math Puzzles, Word Games, Logic Problems, Focus Activities, Two-Player Games. (Develop ... & STEM Skills in Kids Ages 10, 11, 12.)

What If? 10th Anniversary Edition: Serious Scientific Answers to Absurd Hypothetical Questions―An Annotated and Illustrated 10th Anniversary Edition of a Masterpiece of Accessible Scientific Inquiry

Chess: 5334 Problems, Combinations and Games

Math Games with Bad Drawings: 75 1/4 Simple, Challenging, Go-Anywhere Games―And Why They Matter

Ultimate Dot to Dot 1000 Dots: Connect The Dots For Kids And Adults | Hard Puzzle | Extreme Game For Children | Brain Activity Book | Logic Trace ... Activities | Animals | Scenes | Objects

The 125 Best Brain Teasers of All Time: A Mind-Blowing Challenge of Math, Logic, and Wordplay