BrainDen.com, Funology.com and BrainBashers.com are some good sources for riddles. BrainDen.com and Brainbashers.com feature logic riddles and brainteasers, while Funology.com features riddles for kids. Riddle and joke books, which are widely available at libraries and bookstores, are also good sources for riddles.
The Reader's Digest website features riddles, puns and other jokes, and riddles are also available in the magazine's print edition. The Kid's Pages on the National Institute of Environmental Health Sciences website is another good source of riddles and brain teasers. The website features easy riddles, difficult riddles, palindrome riddles and many other types of brain teasers and puzzles.