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Create a text question called Password or Secret Code.
Select Advanced settings from the bottom left corner.
Check the box for Data Validation.
Select “Text” and “Contains”
Put your Password in the TEXT field.
You MUST enter a custom error message like “Access Denied” Otherwise it will report “Text must contain ‘yourpassword'”
Check the box to make it a required question.
Add a page break to separate the password entry page from the rest of the form.