You do not need a difficult question, what you need is a difficult answer
An example of a hard question but easy answer:-
- Q: Hydrogen appears at what position in the periodic table ?
- A: 1
An example of a easy question but hard answer for (say) a car marque forum:-
- Q: What is this forum main content?
- A: Ford Mustang
Ensure Guest posting in not allowed, and you do not have TapaTalk and SPAM will be a thing of the past (well, virtually as Human Scumbags (I mean SCAMmers) will still be able to register lika any other person.