I know it's not as usable for visually impaired people, but I kinda like those that ask you to drag a piece of puzzle on an image : https://github.com/ArgoZhang

I know it's not as usable for visually impaired people, but I kinda like those that ask you to drag a piece of puzzle on an image : https://github.com/ArgoZhang/SliderCaptcha https://github.com/ArgoZhang/SliderCaptcha