Mathematical Toys and Games

Mathematical Games, Toys, and Puzzles
http://compgeom.cs.uiuc.edu/~jeffe/mathgames.html
Clever Games for Clever People — The games of John Conway
http://www.cs.uidaho.edu/~casey931/conway/games.html
Pattern, Mathematics & Games
http://www.raygirvan.co.uk/apoth/1.htm
Pentominoes
http://home.planetinternet.be/~demeod/indexe.html
Math Posters in the London Underground
http://www.newton.cam.ac.uk/wmy2kposters/