Links
Wallpaper Symmetry Groups
Hans Kuiper's page
Excellent discussion with good examples
Another nice page with pictures of Japanese patterns
Xah's wallpaper page
Puzzles & Games
The Grey Labyrinth
Bricks Game Home Page
Ken Duisenberg's Puzzle of the Week
Mathpuzzle.com
IBM Research Ponder This
Miscellaneous
Sloane's Encyclopedia of Integer Sequences
Pentagons that Tile the Plane
Groups of Small Order
Erich's Packing Center
Chaelon Myme's Pantheon of Idols
Funny Stuff
The Brunching Shuttlecocks
The Onion