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with Google example

An example showing the Sign-in with Google feature which can be set on General type publications. The Google email address is stored along with the answers and shown on your publication panel. Once signed-in the respondent can only submit the answers once but can resume a partly-completed quiz.

By the way, if you are already signed-in to Set YOUR own TESTS with Google then you will not see the sign-in button because you are already signed-in.