Mensa Workout
Mental gymnastics from Mensa International

Math Puzzles
Ed Pegg Jr.'s math puzzle site, in the spirit of Martin Gardner's Mathematical
Recreations

Sam Loyd Cyclopedia of Puzzles
View or download an online copy of Sam Loyd's famous Cyclopedia of 5000
Puzzles, Tricks, and Conundrums, which is in the public domain
(c) Rebecca Herold, LLC 2008                                                                                                                                  Email Rebecca Herold