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Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

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Toggle New Brain Teasers (User Submitted) New Brain Teasers (User Submitted)

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New Logic/Math Puzzles

They can be logical [e.g. honestans/swindlecants or hats on death row], math [e.g. probability, sequences], physics or geometry, especially where intuition might suggest wrong answer.

  • 12901 topics
  • 190518 replies
The Cryptic Book - last post by wolfgang

New Word Riddles

Inductive, intuitive, but still requiring some thought (eg. riddle of the sphynx, What-Am-I riddles, anagrams, Shakeepuddn's style, etc.)

  • 1201 topics
  • 24553 replies
The Stuff - last post by JIntorcio

New Optical Illusions

Post amazing illusions you have seen on the web right here.

  • 28 topics
  • 199 replies
Crazy Circle Illusion! - last post by illusion12

Other Mind Boggling Stuff On Web

Anything else on the web that is worth mentioning.

  • 14 topics
  • 129 replies
Too tough for me. - last post by plainglazed

Toggle Old Brain Teasers Old Brain Teasers

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Puzzles and Riddles (section closed)

  1. Logic Puzzles,
  2. Logic Problems,
  3. Water and Weighing Puzzles,
  4. Einstein's Riddles,
  5. Number Puzzles,
  6. River Crossing Puzzles,
  7. Puzzle Championship Teasers,
  8. Geometry/Dissection Puzzles,
  9. Matchstick Puzzles,
  10. Cryptograms and Algebra Puzzles

My favorite puzzles sorted in several subforums.

  • 171 topics
  • 6869 replies
Matchstick Equation - last post by hishanghai


The most famous paradoxes - liar paradox, barber paradox, doubtful existence of God, sentences from life, and sophisms.

  • 42 topics
  • 1880 replies
Unstoppable Force/Immovable... - last post by Kikacat123

Brain Games and Others

Hints and help from other visitors.

  • 19 topics
  • 64 replies
Brain game from computer sc... - last post by antipope

Google Gadgets

Comments on 4 gadgets of mine - Brain Teasers, Puzzles & Riddles, Famous Optical Illusions and Chuck Norris Facts.

  • 2 topics
  • 44 replies
My Google Gadgets in Your L... - last post by Gana Yaswanth

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  1. Goodies,
  2. Baddies

Join mostly role playing games played over several days (eg. Mafia game).

  • 205 topics
  • 84805 replies
The Coup of Rhotus Mafia Si... - last post by Yoruichi-san

Homework Help

This forum is for homework HELP.
DO NOT do others homework for them.
DO NOT ask for others to do your homework for you.

  • 14 topics
  • 123 replies
algebraic continuity theorem - last post by BMAD


Do you know a good joke? One that is appropriate for kids as well? Share it with the world - post it right here.

  • 51 topics
  • 1799 replies
Math Lover? - last post by phil1882

Comments and Suggestions

Your feedback on what to improve and any questions regarding BrainDen.

  • 53 topics
  • 506 replies
​ Symbols appearing when... - last post by rookie1ja


Share your thoughts on anything else not mentioned in other categories (eg. you can discuss philosophy related questions).

  • 60 topics
  • 2863 replies
Shakespearean Curses - last post by Kikacat123

Introduce Yourself

If you want to say hello, share how you got here and what you are looking for in BrainDen forums, then this is the place to do it. One thread per member please.

  • 50 topics
  • 240 replies
Im happy I finally signed up - last post by Kikacat123

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