There's an old type of logic problem which I know by the name of Saints and Pirates. The central premise is that Pirates always lie and Saints always tell the truth. Given this, and given a number of statements made by people who are assumed to be either Pirates or Saints, one sets out to determine which ones if any are Pirates.
There are often additional criteria given to assist the solver, and there may be additional information that is to be determined, such as the name of the Pirate, but the overall idea remains the same.
Here is a simple example of such a problem.
There are 4 numbered suspects whose names are Bri, Dee, Cay and Ann, though it is not known which suspect is which. It is also known that three of the suspects are Saints and that one is a Pirate. Given the following statements made by suspects 1 and 4, determine the name and suspect number of the Pirate.
Suspect 4: I am not Cay and Bri is not a Saint.
Suspect 1: Either Dee is not a Saint or Cay is not a Pirate.
Suspect 4: Either Suspect 2 is not Bri or I am not a Saint.
Now, feel more than free to solve this and post the answer or, if I've screwed up and allowed for multiple possible answers or no possible answer, feel free to point that out as well.
But the real question is, if you encountered such a problem in an mmo, would you:
1. Look up the answer because you view such problems as annoying obstacles.
2. Look up the answer because you wouldn't want to risk possible negative consequences.
3. Look up the answer only if you couldn't solve it after some time.
4. Avoid looking up the answer even if you were never able to solve it.
I think I'd fall into category 3, though its a moot point since I suspect we are well past the time when developers would bother putting such things into an mmo as they fail to cater to the average player.
Note: I've made up hundreds of such problems over the years -- so if there were any interest at all, I might post a few more. Heck, I might post more even if there is no interest.