The World's 200 Hardest Brain Teasers Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain

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<span style="color:red">The World's 200 Hardest Brain Teasers Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain</span>



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Gary Gruber, "The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain"

2010 | ISBN-10: 1402238576 | PDF | 208 pages | 3 MB



FLEX YOUR brain power like never before!



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!



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