Challenging Mathematical Problems With Elementary Solutions, Vol. 1

The Brainteaser Book: 100 Brainteasers with Solutions

Challenging Mathematical Problems With Elementary Solutions (Volume 2)

The Ultimate Book Of Mathematical Brain Teasers: 400 Pattern & Sequence Puzzles

Challenging Mathematical Problems With Elementary Solutions, Vol. 1

The Ultimate Book Of Mathematical Brain Teasers: 400 Pattern & Sequence Puzzles

More math adventures with Penrose the mathematical cat

Math Logic Mysteries: Mathematical Problem Solving With Deductive Reasoning (Gra