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Mathematical
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Providing graded Kakuro puzzles every day, plus old puzzles.
http://www.kakurosan.com
PageRank: 3/10
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Listing added: Dec 9, 2008)
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A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes.
http://www.perplexus.info/
PageRank: 3/10
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Listing added: Dec 9, 2008)
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Answers to technical interview questions, programming problems, and brain teasers.
http://www.techinterview.org/
PageRank: 6/10
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Listing added: Dec 9, 2008)
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