The point is to stop bots, not to be hard questions. I doubt most bots would know how to parse and understand the example I gave. Questions about the game are probably fine, but there are occasionally people that sign up here due to word of mouth, and haven't actually played the game yet. If we use game questions, they should be easy.
The point is, these questions should be easy for a person to understand and reply to, but not easy for a bot to correctly respond to. I'd also like to keep things all on the same page if possible. I'm not totally against asking about something on a linked to page, but I'd rather not trouble people with clicking through links or reading hoards of text just to answer a simple security question. Something that requires understanding the semantic meaning of text or an image is usually good. Evaluating a mathematical expression, or something that follows rigorous rules is probably bad. Something with a large possible answer space (a string of arbitrary length) yet which is still obvious is good, while a small answer space is bad. Multiple choice questions are particlarly bad (a bot could just guess, and get the answer with reasonable probability). Asking someone to identify a unit from an image is also not so great, as there are a relatively small number of units (but at least it would require domain specific knowledge, so they'd have to target us specifically). For text questions, it would also be good if the question changed slightly each time, so they couldn't just store known (question, answer) pairs. The random lines in security images basically do that, along with the size of the image. For actualy text you might need to get more creative, although, something simple should keep them away for a little while.
I'd like to keep things simple for now, such as choosing a random word from a somewhat large body of text. The terms of service seems like a good candidate for that. (Plus, it ensures they've at least read some of it). Still though, if you have better ideas, please post something specific. Actual questions would be nice, like: "What does an argridome produce that keeps your population from starving?".
