I have looked at dozens of login plugins (Members only, WP Password, Registred Only,...) but I just want a simple question and answer login form. For example "What's the name of the mother?". If the question is answered correctly, you are redirected to the weblog, else bounce back to the question form.
This way only my family and friends can login and don't need to register themself. Simple and effective.
Does anyone know such a plugin or can give me some hints on making such a plugin myself?