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Open Directory - Games: Puzzles: Brain Teasers: Mathematical
Science: Math: Recreations: Games and Puzzles
- Shareware game based around an extension of the game of life.
IBM Research: Ponder This
- Monthly logic and math puzzles set by IBM researchers with solutions.
Jim Loy's Puzzle Page
- Classic and original puzzles.
Leisure Ideas: Puzzles
- Some mathematical puzzles with answers and/or a hint.
- Number puzzles with various levels of difficulty and solutions. Includes printable versions.
Monty Hall Game
The Monty Hall Problem
- A probability theory puzzle with solutions. [English and German.]
- 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.
Quick Logic Puzzles
- Use the clues provided to deduce the correct sequence of numbers in the hidden code.
Two Envelope Paradox - Solution
- Claims that the two envelope paradox comes from the incorrect use of probabilities.
- Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
Brain Teasers - Mathematical
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