- Rubik Online - official Rubik's Cube web site.
- Enchanted Mind - puzzles, humor, and inspiration to enhance creativity.
- Kadon Enterprises, Inc. - games and puzzles like Pentominoes, Penrose Tiles, Tessellations, and other abstract strategy games.
- Bits and Pieces - collection of jigsaw and mechanical puzzles, secret puzzle boxes, mechanical banks, kaleidoscopes, etc.
- Lobstersoft - offers free downloads of puzzle and board shareware games for all ages.
- Briarpatch - makers of games and puzzles for children.
- Puzzability - writes puzzles for adults or kids, print or electronic media, general-interest or made-to-order.
- Spilsbury Puzzle Company - features a wide selection of jigsaw, specialty, shaped, and 3D puzzles. Also sells electronic hand held, board, and trivia games.
- Livewire Puzzles - a mail order store specializing in wire disentanglement puzzles. We sell puzzles that are both challenging and fun.
- Tessellations - maker of Puzzellations puzzles (with foam rubber tiles), posters, and kaleidoscopes inspired by M.C. Escher, as well as mathematicians like Penrose and Mandelbrot.
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