so... there would only be 4 possible choices for a bot to make to guess correctly?

left, right, up, and down?

Unique ones with more choices can be machine generated and checked by a human before being deployed. Nevermind, that might be hard for humans, so multiple consecutive captchas would be better. This would make brute force becomes the best option. The goal is for the crawlers to give up attempting yet another VitaCaptcha and try something else, like playing the lottery.

Feel free to send job, investment, research grant and education offers to me.

Edit: Asked Stanford if they could sponsor my research and education into this.