Great that you like the idea!
The site i want to build is very simple. The user will have to solve a mystery with lots of questions, and then get to a form with registration when they have completed all questions right.
So, i guess a message with just “Wrong answer” is enough and a “Close” button that have to be clicked and they can try again. Maybe a limiter for inputs/minute so you can’t brute force the correct answer?
I will have a look at the code also and see if I can give you any suggestions! 🙂