The World's 200 Hardest BRAIN TEASERS : Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain /
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...
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Petaling Jaya : Advantage Quest Publications,
2011
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