I'd like to implement something similar to a captcha code. When a respondent enters a survey they would see a 6 digit code which would need to be typed by the respondent. If the respondent gets it wrong then the respondent should skip out of the survey.
At the moment I've done this manually by creating multiple open-end question pages with a static 6 digit code. A respondent randomly will currently see one of these pages/codes and and I can screen people out if they don't type the correct code.
I do a lot of jobs with a particular client who wants to create lots of these pages and doesn't want the same codes on different jobs so it's time consuming. Does anyone know a more efficient way to generate a random code and if the respondent doesn't enter the code shown, they would skip to a terminate question.