Nice quiz, but I'd expect a higher standard for featured ones.
For a small, two-letter suffix, it surely has a broad usage.
plus I dont see why the yellow box is necessary, there is no way you can accidentally fill in other answers.
"Vania" may be a suffix but not in the two examples reported, where the actual suffix is "sylvania" - from Latin "silvis, silvis" - meaning "woodland".
"Mania" in Tasmania and Romania is not the suffix, which should be "-ia", meaning "land of (what precedes)": Romania is "land of the Romans", Tasmania is "land of Tasman".
Very disappointing quiz to be honest.
The one with "ton" can also be "borough"... I suppose I'm only aware of that though because Kingsborough is quite close to me. It's tiny as well. If you wanted to make a type-in though it would be correct..?