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Jim Loy's Puzzle Page
Classic and original puzzles. (infos)The Truth Tree's Math and Logic Board
Collection of math and logic puzzles ranging in levels of difficulty. (infos)
IBM Research: Ponder This
Monthly logic and math puzzles set by IBM researchers with solutions. (infos)
TechInterview
Answers to technical interview questions, programming problems, and brain teasers. (infos)
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. (infos)
The Monty Hall Problem
A probability theory puzzle with solutions. [English and German.] (infos)
Mathematical Jigsaw Puzzles
Information on polyominos and square puzzles. (infos)
WU Forums
Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers. (infos)
Two Envelope Paradox - Solution
Claims that the two envelope paradox comes from the incorrect use of probabilities. (infos)
Quick Logic Puzzles
Use the clues provided to deduce the correct sequence of numbers in the hidden code. (infos)