Tough brain teasers, with answers, courtesy of NSA employees

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According to NSA’s Puzzle Periodical, “Intelligence. It’s the ability to think abstractly. Challenge the unknown. Solve the impossible. NSA employees work on some of the world’s most demanding and exhilarating high-tech engineering challenges. Applying complex algorithms and expressing difficult cryptographic problems in terms of mathematics is part of the work NSA employees do every day.”

You can try a couple of their recent, and quite tough, brain teasers here:

• August Puzzle Periodical: $50 for All

• July Puzzle Periodical: First or Second?

More brain teasers, games and illusions here.

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