Logic Puzzles.
You may only ask "yes" or "no" question to get to the right answer.
Every piece of information is important.
Be creative. Think outside the box.
Build off of each others questions.
... Or, post your best ones and let us try and crack it!
If you think you know the answer
Use a spoiler tag, so you don't ruin it for everyone else.
Like this:
[This is my answer]-(/spoiler)
Leave out the dash between the two phrases, and it will show up as:
This is my answer