Yeah, we've still got some kind of server issue to work out.
The two MODs are similar, but there are some difference. Mine contains multiple questions, and picks one at random. Plus, more can be added easily (and I haven't tested it, you should also be able to incorporate an image into the question, such as "What is this a picture of: <img src='/images/some_image.jpg'>").
Another feature includes the ability to have more than two responses to a question, so you can list all possible correct responses that you can think of. Also, I don't know if the other MOD does this or not, but mine will save a cookie when validation is successful so that user won't have to validate again.