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We have implemented Tic-Tac-Toe http://demo.axiomnext.com http://demo.axiomnext.com Click on login to see it. Sorry forgot the source URL from where we took

• ProblemFactory 13y ago
  That seems to be very weak compared to traditional captchas. * It is no more than a weekend project to extract the Xs from the image and write a solver. * Even without a image processing, the number of possible answers is 7. A 14% success rate is plenty for an automated spambot. The only benefit is obscurity: a solver would have to be custom-built for this captcha and website. But a text field with instructions "type the word 'blue' here" would work just as well for keeping out non-customised spambots.