title: How to reduce recaptcha difficulty level
body: <p>Some of the captchas produced by reCAPTCHA are unreadable.
  Are there any configurations that we could use in order to lower difficulty level of reCAPTCHA (I'm using reCAPTCHA PHP API)</p>
  
  <p><strong>OR</strong> Are there any reCAPTCHA like services that doesn't use php gd library?</p>