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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.
Inductive, intuitive, but still requiring some thought (eg. riddle of the sphynx, What-Am-I riddles, anagrams, Shakeepuddn's style, etc.)
Post amazing illusions you have seen on the web right here.
Anything else on the web that is worth mentioning.
My favorite puzzles sorted in several subforums.
The most famous paradoxes - liar paradox, barber paradox, doubtful existence of God, sentences from life, and sophisms.
Hints and help from other visitors.
Join mostly role playing games played over several days (eg. Mafia game).
This forum is for homework HELP.
DO NOT do others homework for them.
DO NOT ask for others to do your homework for you.
Do you know a good joke? One that is appropriate for kids as well? Share it with the world - post it right here.
Your feedback on what to improve and any questions regarding BrainDen.
Share your thoughts on anything else not mentioned in other categories (eg. you can discuss philosophy related questions).
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.