title: How does this checkbox recaptcha work and how can I use it?
body: <p>I've recently signed up to the oneplusone website <a href="https://account.oneplus.net/sign-up">https://account.oneplus.net/sign-up</a>, and noticed this checkbox recaptcha</p>
  
  <p><a href="https://i.stack.imgur.com/jqNhK.gif"><img src="https://i.stack.imgur.com/jqNhK.gif" alt="checkbox recaptcha"></a></p>
  
  <p>How does it work, and how can I use it on my sites? Much better than those cryptic words/digits:)</p>
  
  <p>The recaptcha site does not mention any new recaptcha method... <a href="https://www.google.com/recaptcha/intro/index.html">https://www.google.com/recaptcha/intro/index.html</a></p>