Ended up with roughly 75% correct human responses and 40% correct using a bot. Which are pretty poor stats for both sides of the equation.
I would continue working in this. I have some feedback to make it harder for robots and easier for humans. Consider this as some quick ideas that should be elaborated (and they may be wrong):
- Move the letters in opposite direction to the windows and maybe rotate them or make them move inside the canvas. - Make the windows appear in randomize locations but move them faster. - Make the blacked part change colors.
I think this is a very, very good way to make a turing test. Congratulations.
The main issue was that some browsers render the frames so slowly it was almost impossible. Also, while making it slightly harder to crack with a bot it can be done by merging the frames together and tracking the lightest parts to find the letters which can then be put through OCR.
Also, while making it harder for bots to crack it also makes it significantly harder for people to read, especially people without 20/20 vision which is a major problem.