Captcha is the security feature that requires web site visitors to rewrite distorted words to prove that they are human and not a computer bot. Renowned for being one of the more frustrating online security measures, KitKat worked with PlayCaptcha advertising to launch a more engaging and fun alternative to Captchas for KitKat fans. Instead of guessing the skewed words users can simply swipe along KitKat foil by using either their finger on a touch screen or a mouse on a PC.