Links to Other Puzzle and Problem Pages

Stan Wagon's Macalester College Problem of the Week
Erich Friedman's Math Magic
Ed Pegg Jr.'s Math Puzzle of the Week
IBM Research's "Ponder This"
Math Forum: Problems of the Week
DIOPHANTE.FR (Mathematical Recreations [in French])
Purdue University's Problem of the Week
Eastern Illinois University's Challenge of the Week
Iowa State University's Problem of the Week
The Problem Site
Columbus State University Math Contest
The Puzzling World of Barry R. Clarke
Michael Brand's "Using your Head is Permitted"
"The Puzzle Toad" at the Carnegie Mellon School of Computer Science
Carlos Rivera's "The Prime Puzzles & Problems Connection"
Project Euler (a series of challenging mathematical/computer programming problems)
Math Problems from Qafqaz University (Azerbaijan) and their problem-solving group
Ken Duisenberg's Problem of the Week (mostly archival)
Harvard University Department of Physics Problem of the Week (archival)
Nick's Mathematical Miscellany (archival)
Tim Sakharov's Interactive Puzzle Solution Center (archival)

If you have a link to a "non-commercial" site you'd like to add, please send it to
(The site can be affiliated with a company, but the principal purpose of the page should be problem-solving, not trying to sell something.)

This page is maintained by Les Reid.
Last updated: January 5, 2013