A Collection of Quant Riddles
   Logical and lateral type thinking riddles with some answers.
   http://puzzles.nigelcoldwell.co.uk

Able2Know
   A public forum for riddlers and riddle lovers in several topics.
   http://www.able2know.com/aa_riddles.php

Amusements in Mathematics
   Riddles by Henry Ernest Dudeney.
   http://www.thinks.com/puzzles/dudeney/dudeney.htm

Brain Teasers
   Classic puzzles and riddles sorted in several sections - general logic, weighing puzzles, Einstein's riddles, number sequences, and crossing river.
   http://brainden.com/puzzles-riddles.htm

Braingle's Riddles
   Contains thousands of popular riddles, as well as user submitted and rated riddles.
   http://www.braingle.com/Riddle.html

Daily Outrageous Rebus Riddle Contest
   Cartoon rebus riddles posted daily. Answers are submitted by e-mail.
   http://rebuspage.home.comcast.net

DiMensIoNS
   Riddles abound, odd and complex riddles, brain teasers. Explained meanings and complete answers.
   http://www.some-guy.com/riddle.html?contents

Fleabusters' Kids Fun Page
   Riddles with responses as well as unanswered.
   http://www.fleabuster.com/Kids/kjokes.html

Funny Riddles
   Categorized collection.
   http://www.funny-riddles.com

Harder Riddles
   Some harder riddles marked with stars to identify the degree of difficulty of each riddle. Accompanied with answers.
   http://puzzle.dse.nl/harder/index.html

Historiddle
   Collection of free internet puzzles, riddles and brain teasers based on the history of the 20th century.
   http://historiddle.50webs.com/

HumorShack
   Archive of cartoons, riddles with answers and a free mailinglist.
   http://humorshack.com/archive/riddles/index.shtml

Jason's Puzzler Page
   Small collection of riddles with answers.
   http://www.jasonspuzzlerpage.150m.com/

MindBreakers
   Since 1995 free puzzles, riddles, brain teasers, quizes, and games. Fascinating riddles and multipart puzzles.
   http://www.mindbreakers.com/

OnlyRiddles.com
   Searchable database of riddles with answers. Accepts visitor submissions and offers an RSS feed.
   http://www.onlyriddles.com/

PickandSend
   A collection of brain teasers, riddles, and logic puzzles. Answers on highlight, sending feature.
   http://www.pickandsend.com/riddles/puzzles.htm

Puzzles & Riddles
   IT experts provide answers to some of the most demanding puzzles and riddles.
   http://www.experts-exchange.com/Miscellaneous/Puzzles_Riddles/

Puzzles by Sam Loyd
   Ten puzzles from a collection that appeared in various newspapers and magazines over the previous fifty years.
   http://www.thinks.com/puzzles/loyd/loyd.htm

Random Riddles
   A collection of submitted riddles.
   http://www.srainc.com/people/brentr/riddles2.html

Riddle Planet
   A contest with twenty-five riddles per each classified round with a money prize for the first person to solve them all.
   http://www.mtgplanet.com/riddleplanet

Riddle of the Week
   Just one question a week. Answer on e-mail.
   http://www.frontiernet.net/~carlise/riddle/index.html

Riddle-Poems, and How to Make Them
   The gentle and literate art of the rhyming riddle.
   http://www.catb.org/~esr/riddle-poems.html

RiddleAday
   Riddles, puzzles and brain teasers to challenge and entertain all ages. [E-mail lists]
   http://www.riddleaday.com/

Riddles
   Some challenging riddles to solve. Answers below each of them.
   http://www.leisureideas.com/riddles.htm

Riddles at Funtestiq
   Interesting riddles served to you automatically.
   http://www.funtestiq.com/riddlesanswers/riddles.shtml

Riddles.com
   Large riddle database categorized by difficulty. Includes a search feature.
   http://www.riddles.com/

Scatty.com: Riddles
   Collection, sorted into lots of categories to amuse, puzzle and test.
   http://www.scatty.com/jokes/riddles/index.html

Spreadsheet Jokes
   A bunch of riddles on spreadsheet programs.
   http://www.j-walk.com/ss/jokes/riddles.htm

Stumpers
   Math and word riddles, which were created by students in Mrs. Henson's classroom. Includes answers.
   http://www.concentric.net/~Ahenson/riddles.html

Sureshot Riddles
   A fun and challenging collection of logic riddles and sequences.
   http://www.sureshotsoftware.com/riddles/

The Masters of Logic
   The difficulty of the logic puzzles increases until almost unsolvable. The list "The Masters of Logic" shows the solutions.
   http://www.helary.de/logic/pers/aufg/index_aufg.html

The Riddle Contest
   An online contest for riddle lovers. Expect to encounter a broad array of different puzzle types as well.
   http://www.theriddlecontest.com/

Tree Riddle
   An old multiple riddle. Identify 65 names of trees.
   http://www.thinks.com/riddles/tree.htm