Brain Teasers Forum: Brain Teasers Forum

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.

• Today, 07:43 AM
• In: How Many Prime Numbers?
• By: xamdam 

New Word Riddles

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

• Today, 04:59 AM
• In: A Passerby
• By: trickythief 

New Optical Illusions

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

• Yesterday, 06:09 AM
• In: zebras
• By: Jonn 

Other Mind Boggling Stuff On Web

Anything else on the web that is worth mentioning.

• Yesterday, 05:33 PM
• In: Facial Recognition
• By: JonTam 

Puzzles and Riddles

My favorite puzzles sorted in several subforums.

Subforums:

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

• 03 November 2009 - 02:11 PM
• In: Gardens
• By: AVV 

Paradoxes

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

• 04 November 2009 - 08:29 PM
• In: Liar Paradox (Eubulid or Ep...
• By: nonothing 

Brain Games and Others

Hints and help from other visitors.

• 10 October 2009 - 07:50 PM
• In: Soukoban level 12- help I...
• By: deeko 

Google Gadgets

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

• 05 November 2009 - 10:24 PM
• In: How many members found Brai...
• By: chrispen 

Games

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

Subforums:

1. Goodies
2. Baddies

• Today, 09:30 AM
• In: Scooby-Doo Where are They! ...
• By: Lost in space 

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.

• 03 November 2009 - 10:55 PM
• In: Research Project
• By: K4D 

Jokes

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

• Yesterday, 02:04 PM
• In: Butch the Rooster
• By: Brandonb 

Comments and Suggestions

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

• 03 November 2009 - 01:12 PM
• In: Mafia sub forum in Games
• By: Lost in space 

Others

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

• 04 November 2009 - 10:42 PM
• In: Google Wave
• By: Izzy