Cryptarithms Online(18th November, 2009): 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web.
Mathmos(27th April, 2005): Includes puzzles, jokes, quotations, poetry, and FAQs.
Mathematische Basteleien(27th April, 2005): Topics include Flexagon, Soma Cube, Pentominos, Cube-it, Rubik's Cube, Froebel's Star, Tangram, House of Santa Claus, Chronogram, Numeric Palindromes, Latticework of Letters. English/German.
Mathematik(27th April, 2005): Individual pages on different topics in Mathematics. Examples : group theory, dynamical systems theory, geometry or number theory.
Top Sites - Main » Science » Math » Recreations
Cryptarithms Online (): 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web.
Math Cats (): A magic chalkboard takes you to a math art gallery and lots of interactive math activities, including: magic squares, conversions, seasonal surveys, symmetry, tessellations, geometric designs, games.
Mathematische Basteleien (): Topics include Flexagon, Soma Cube, Pentominos, Cube-it, Rubik's Cube, Froebel's Star, Tangram, House of Santa Claus, Chronogram, Numeric Palindromes, Latticework of Letters. English/German.