Thansk for the fine fresh Feedback!
So far, i do need to use magnify.exe a lot for them, it's so annoying...

On the other hand maybe ReCaptcha is indeed safer, because after all it prevents not only bots but also HUMANS from solving it most of the time.

It's exactly my thought sometimes...

These alternatives are pretty hard, but i think if you search for the answer, one might learn something new, or not depending on the person. That Puzzle one, could be a problem though... I have the feeling these are exceptionally meant to annoying persons, so that they might give up and use premium.