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• Alphametic Solver - solver for addition alphametic puzzles.
•  Brain Storm - math problems designed to test intelligent minds.
•  Cryptarithms Online - 40 brain-teasers for your entertainment; a Primer on Cryptarithmetic; books and links to the best collections of alphametics on the Web.
•  Défi - des problèmes amusants qui font appel à votre sens de la logique et à votre esprit mathématique.
• Exercise Your Brain! - riddles for undergraduates and novices in math.
•  Grey Labyrinth, The - seeking to stimulate interest and curiousity into the human mind.
•  HKTay's Maths Page - the horses problem, 100 bucks problem and more.
•  Interactive Mathematics Education and Puzzles - collection of JavaScript and Java pages with math problems, solutions and sample investigations.
•  Interactive Mathematics Miscellany and Puzzles
•  Interesting Mathematical Aphorisms
•  Little Math Puzzle Contest, The
•  Logic and math problems - difficulty levels, answers, and solutions usually given.
•  Math problems and puzzles - collection of math problems ranging from common sense problems to algebra and calculus.
•  Math Puzzles
•  Mathematics of the Rubik's Cube
•  Mr. J's Real Math Page - with the Problem/Project of the Month.
•  Mr. Titen's Fun Page - challenge problem of the week for middle schoolers. Also, math tricks to amaze and astound your friends and relatives.
•  Mrs. Hoffmann's Math Puzzles
•  Nasty Calculus Question Contest - win a six-pack of Hawaiian Punch.
•  Olympiad Math Madness
•  Playful Thoughts - recreational math problems.
•  Problem Corner - review
•  Puzzlers - puzzles with a mathematical basis.

 Web Wizard's Math Challenge - ongoing Internet contest.