Also the option to prevent retakes doesn't exist on any quiz, so I cannot implement this, nor do I think it should be. Part of JetPunk is taking, learning and then retaking to retest your knowledge. If you remove that ability to retake you're stopping people from being able to learn.
One point: "maximum elevation over..." doesn't make much sense. Nepal's maximum elevation is over one meter, for example.
So the clue is exactly as intended :)