http://www.cut-the-knot.com Interactive Mathematics Miscellany and Puzzles Raymond Smyullan http://www.cut-the-knot.com

"Clever Games for Clever People: These games are all taken from: Conway, John. 1976. On Numbers and Games. New York: Academic Press, Inc. " http://www.cs.uidaho.edu/~casey931/conway/games.html

Elwyn Berlekamp's Home Page," What's Hot in Game Theory, Publications Algorithms Applied Analysis Games Dots-and-Boxes Four Games for Gardner Mathematical Go Recent Progress Cyclotomics Logo Encoders Finance Information Theory and more..." ..http://www.math.berkeley.edu/~berlek/   recommended-nice design

Torsten Sillke's Games index of Martin Gardner's book with futher references, Lots of Games and Puzzles. ...Operations Research Puzzles Crossing the bridge - with a lamp (Crossing the bridge (long)) discrete optimization - and a C program Logic Puzzles Sum Product - The impossible Puzzle Logic Puzzle - How old are they? lias and truth tellers - who is the spy? http://www.mathematik.uni-bielefeld.de/~sillke/

Numbers and the Golden Section: University of Surrey
There is a large amount of information at this site (more than 200 pages if it was printed), so if all you want is a quick introduction then the first link takes you to an introductory page on the Fibonacci numbers and where they appear in Nature.

Cube Lovers archives (Martin Schˆnert homepage)" I am also interested in Rubik's Cube, and related puzzles. I have converted the Cube Lovers archives to HTML (all 1947 articles between July 1980 and June 1996, the index is 205k)." http://www.math.rwth-aachen.de/~Martin.Schoenert/Cube-

The MacTutor History of Mathematics archive: Created by John J O'Connor and Edmund F Robertson http://www-groups.dcs.st-and.ac.uk/~history/index.html

Number Line: "Number Line was invented in Japan. At first it may seem difficult, but don't worry. I am going to give you many tips to help you enjoy it on this web site soon. How to Play Rules Connect dots with vertical / holizontal line and make one loop...." by Hirofumi Fujiwara (Japan) http://kjmcci.kct.ne.jp/~fuji/java/puzzle/numline/index-eng.html

Games by Rodolfo Valeiras: These games are offered "gratuitamente" and are downloadable programs: juego del 15(game 15), de Sam Loyd, JOP-1, inspired by Rubic's Cube - also many pages of games, problems and puzzles including solution to Nob's No Off sliding block puzzle

Ken's Puzzle of the week. Solve the problem of the week-also archives of problems from 1996-2000-help solve unsolved problems- check out his puzzle links page -Ken Duisenberg http://www.ecst.csuchico.edu/~kend/potw/current.html

http://www.atelier-archimedia.org you will find there: paradoxical puzzles, mechanical puzzles, optical illusions, mathemagical cards, puzzles to solve, etc...

Math in the Movies: Lists movies with "math scenes" NEW!

Pentominoes Project: This site, is a site about pentominoes. It is a project of T.I.D. Ronse (Belgium). Join their competition. NEW!

Three Door Puzzle(like" Lets Make a Deal") by Sky Coyote: Simulation, Explanation, and more http://www.intergalact.com/threedoor/threedoor.html

Graphics for complex analysis -- Douglas N. Arnold http://www.math.psu.edu/dna/complex-g.html

The rec.puzzles archive is a list of puzzles, categorized by subject area. Each puzzle includes a solution, compiled from various sources, which is supposed to be definitive. http://einstein.et.tudelft.nl/~arlet/puzzles/

Finding Addresses of Mathematicians-http://www.math.upenn.edu/FindAddress.html#math

Recreational Mathematics: "Recreation is in the eye of the beholder, and not everything here was originally intended as recreational by its authors. Like many, I was inspired early on by Martin Gardner's Mathematical Games column, which included "included a mixture of puzzles, silliness, curious/useless math, and quite serious (but not overly technical) math. In that spirit, I list here some web resources for recreational math. David Epstein " http://www.ics.uci.edu/~eppstein/recmath.html

:Mathematics and Chess Page Chess teaches many things, including strategic thinking. Though one might think at first that this type of thinking is unrelated to mathematics, in fact, chess also teaches a type of "calculation" (see Soltis's book [4] for the exact idea). To anyone who thinks doing mathematics and playing chess are unrelated, this page is for you. Mario Velucchi http://web.usna.navy.mil/~wdj/math_chess.htm, http://www.cli.di.unipi.it/~velucchi/intro.html

NATIONAL PUZZLERS LEAGUE - "Welcome to the National Puzzlers' League. Whatever wordplay delights you...palindromes, cryptograms, crossword-type puzzles, cryptic crosswords, anagrams, poetry writing, discovering the word SCHOOLED has the letters in the words SHOE and COLD perfectly interlaced...you'll probably find it in our monthly publication, The ENIGMA. "

THINKS.COM - The brain games, puzzles and pastimes website

MathSoft "This page is a service of MathSoft, Inc. and the Massachusetts Institute of Technology's Technology Review (ISSN 0040-1692, Reg. U.S. Patent Office). Most of the mathematical puzzles featured here were previously published in Allan Gottlieb's column in the Tech Review. Puzzle content reproduced here is Copyright 1995-1998, Technology Review, all rights reserved. Check in periodically here for new math puzzles and solutions for older puzzles..." http://www.mathsoft.com/puzzle.html

Last updated on 4 agosto 1996-QUERIES ON "SOURCES IN RECREATIONAL MATHEMATICS" by David Singmaster I would be grateful for any information you can provide on the problems sketched below.