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Shareware game based around an extension of the game of life.
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Monthly logic and math puzzles set by IBM researchers with solutions.
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Classic and original puzzles.
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Providing graded Kakuro puzzles every day, plus old puzzles.
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Some mathematical puzzles with answers and/or a hint.
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Information on polyominos and square puzzles.
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JavaScript example of the Monty Hall Game. This game demonstrates the real (empirical) affect of statistics. [Does not display correctly in all browsers.]
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A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The puzzles are searchable and categorized, most have solutions.
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Use the clues provided to deduce the correct sequence of numbers in the hidden code.
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Answers to technical interview questions, programming problems, and brain teasers.
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A probability theory puzzle with solutions. [English and German.]
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Contains puzzles and games with solutions.
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Collection of math and logic puzzles ranging in levels of difficulty.
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Claims that the two envelope paradox comes from the incorrect use of probabilities.
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Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
