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

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

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

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

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

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

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

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

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/

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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