Many thanks to the following people and puzzle sites for linking to this site:

- Cliff Pickover, from one of his many puzzle pages
- Carlos Paula Simões, from Inteligência e Q.I.
- Steve Schaefer, puzzlemaster of MathRec, from his Older Topics and Links
- The Open Directory Project, from its Science: Math: Recreations: Games and Puzzles category
- Paul Hsieh's Puzzles
- John Hanna, from Useful Links
- Skytopia, from Super impossible math questions (offsite links)
- The Prime Puzzles and Problems Connection, from Links
- Michael Shackleford, from Math Problem Links
- The Yahoo! Directory, from Problems, Puzzles, and Games
- BlackStump, from Puzzling things
- WhiteStick, from Online games
- Henry Cohn, from Henry Cohn's random mathematical thoughts
- Uncle Bob, from Uncle Bob's Puzzle Corner
- Thinks.com, from Mathematical Puzzles
- PuzzleUp, from Links
- The Mind Breakers - Puzzles, Riddles, Brainteasers and Card Tricks, from Links to other fun sites
- Math, Puzzles, Magic, Mazes, Illusions, from Recreational Math
- Puzzles of Leonid Mochalov, from Link Partners
- Puzzles.com, from Puzzles in Education - Educational Links
- Archimedes' Laboratory, from Interesting Links
- Puzzle Express, from Puzzle Links
- Livewire Puzzles, from Puzzle JumpStation: Miscellaneous Puzzles
- A good collection of Brain Teasers, from Tony Heyes