Suggestions for conditional form

I am looking for a way to have a form that will open a link if the correct input/password is input, and display an error message if an incorrect answer is input.

Current setup – uses block password protection. When the correct password is entered additional content is displayed on the page. Running into issues with page caching on some internet browsers.

Preferred solution – input field with a button.

correct input = button opens a link

incorrect input = display “incorrect” (or some other text) below the input field

I’ve been looking at quiz style plugins but haven’t been able to find something suitable yet.

Does anyone have any suggestions for a way this could be implemented? I have VERY basic programming skills so I prefer something plugin based.

 

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