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