Quant, Math & Computer Science Puzzles for Interview Preparation & Brain Teasing
A collection of ~225 Puzzles with Solutions (classified by difficulty and topic)

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Some famous people who have shown love:
Select amongst "Top 10 Math Blogs" by http://www.guidetoonlineschools.com/tips-and-tools/best-math-blogs
Select amongst "101 Prime Sites on Advanced Math" by http://onlinemathdegrees.org/prime-resources/
Selected amongst "Top Math Sites" by http://math.alltop.com/
Featured in Tanya Khovanova's blog roll at http://blog.tanyakhovanova.com/
Featured in NLab's blog list at http://www.ncatlab.org/nlab/show/math+blogs
Featured in "Theorem of the Day" at http://www.theoremoftheday.org/Resources/RelatedSites.htm
Some mentions on quora: