(Point is, some "quizzes" are made cynically to demonstrate a flaw in some design. Don't get your ego all bruised up because you got some questions "wrong" on the internet.)
While that's true, neither the Rust nor C++ Quiz are for this purpose. They're intended as an opportunity to learn, what's actually going on and how does that differ from your intuition.
The password game is a game first and a commentary on how stupid "password rules" are second. The game makes sense in our cultural context (where stupid password rules are a thing) but it would be fun (but less popular) anyway.
However you might well enjoy https://dtolnay.github.io/rust-quiz/
Like the C++ quiz, "Undefined Behaviour" is a valid answer, however, the quiz questions are about safe Rust, so that answer is always wrong.
I still get more than half of them wrong unless given far too long to think about it.