My Best Mathematical and Logic Puzzles (Dover Recreational Math)
300+ Mathematical Pattern Puzzles: Number Pattern Recognition & Reasoning (Improve Your Math Fluency)
The Stanford Mathematics Problem Book: With Hints and Solutions (Dover Books on Mathematics)
The USSR Olympiad Problem Book: Selected Problems and Theorems of Elementary Mathematics (Dover Books on Mathematics)
Learn Logic & Math Together (For ages 9+)
The Original Area Mazes: 100 Addictive Puzzles to Solve with Simple Math-and Clever Logic!
The 125 Best Brain Teasers of All Time: A Mind-Blowing Challenge of Math, Logic, and Wordplay
Of Course! The Greatest Collection Of Riddles & Brain Teasers For Expanding Your Mind
Codes, Ciphers and Secret Writing (Dover Children's Activity Books)