World's 200 Hardest Brain Teasers(English, Paperback, Gruber Gary R. Dr)
Quick Overview
Product Price Comparison
From acclaimed author Dr, Gary Gruber, whose proven critical-thinking methods have sold more than seven million books, this collection of mind-bending brain teasers is sure to challenge even the most experienced problem solver. Inside are logic puzzles, riddles, maddening math problems, mental games, and more!