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| | Games and Puzzles - Recreations, Math, Science 75
 CellFighterCellFighter
 Shareware game based around an extension of the game of life.
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IBM Research: Ponder ThisIBM Research: Ponder This
 Monthly logic and math puzzles set by IBM researchers with solutions.
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Jim Loy's Puzzle PageJim Loy's Puzzle Page
 Classic and original puzzles.
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Kakuro-sanKakuro-san
 Providing graded Kakuro puzzles every day, plus old puzzles.
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Leisure Ideas: PuzzlesLeisure Ideas: Puzzles
 Some mathematical puzzles with answers and/or a hint.
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Mathematical Jigsaw PuzzlesMathematical Jigsaw Puzzles
 Information on polyominos and square puzzles.
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Monty Hall GameMonty Hall Game
 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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The Monty Hall ProblemThe Monty Hall Problem
 A probability theory puzzle with solutions. [English and German.]
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PerplexusPerplexus
 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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The Puzzles of OscarThe Puzzles of Oscar
 Contains puzzles and games with solutions.
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Quick Logic PuzzlesQuick Logic Puzzles
 Use the clues provided to deduce the correct sequence of numbers in the hidden code.
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TechInterviewTechInterview
 Answers to technical interview questions, programming problems, and brain teasers.
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The Truth Tree's Math and Logic BoardThe Truth Tree's Math and Logic Board
 Collection of math and logic puzzles ranging in levels of difficulty.
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Two Envelope Paradox - SolutionTwo Envelope Paradox - Solution
 Claims that the two envelope paradox comes from the incorrect use of probabilities.
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WU ForumsWU Forums
 Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
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