See also: https://earth.2020.cscg.de/tasks/Captcha https://earth.2020.cscg.de/tasks/Captcha It's very much in the same spirit. A series of weak captchas that a

See also: https://earth.2020.cscg.de/tasks/Captcha https://earth.2020.cscg.de/tasks/Captcha It's very much in the same spirit. A series of weak captchas that a human can not solve in the time allotted.