Great quiz! Few suggestions, Bajo Nuevo Bank and Serranilla Bank can be added and type-ins can be added for the words island, atoll and reef for easier answering
I made the decision not to add them because they're not controlled by the USA.
As for the type-ins, I did not add them because the JP ones for the Marshall Islands and the Solomon Islands require both full words and i wanted to follow that standard.
I grind a lot; there are also tricks to level up fast, like using the random function (set up to untaken or not 5/5 quizzes) and going to quizmaster's series page and doing his quizzes, since like 99% of them are featured.
As for the type-ins, I did not add them because the JP ones for the Marshall Islands and the Solomon Islands require both full words and i wanted to follow that standard.
But JP is just soooo fun....