The Ultimate Activity Book for Awesome Engineers: Tricky Brain Teasers, Mind Games and Logic Puzzle Book for Smart Adults (Perfect Gift for Engineers)

Original Sudoku Page-A-Day® Calendar 2025: 365 Puzzles from the Editors at Nikoli

1000+ Sudoku Diabolical to Extreme Puzzle Book for Adults: A Book With 1000+ Sudoku Puzzles from Diabolical to Extreme for Adults.

Activity Book For Kids Ages 8-12 Years Old: Fun and Challenging Activities, Puzzles, and Games for Amazing Boys and Girls: Mazes, Crosswords, Math Challenges, Word Searches, and More!

My Best Mathematical and Logic Puzzles (Dover Recreational Math) (Dover Math Games & Puzzles)

1,000++ MEDIUM Sudoku Puzzles Book: Top Quality Paper, Best Puzzles, Free Bonus! (Sodoku Puzzle Books for Adults)

The Original Area Mazes: 100 Addictive Puzzles to Solve with Simple Math―and Clever Logic!

The Colossal Book of Mathematics: Classic Puzzles, Paradoxes, and Problems

Sharp Minds for Seniors: The Ultimate Puzzle Book for Retirees to Boost Memory, Increase Cognitive Abilities and Have Fun with Brain Games and Activities (The Perfect Gift)

Brain Teasers for Smart Engineers: Tricky Brain Twisters, Mind Games and Fun Problem Solving for Engineers (Perfect Gifts for Engineers)