nice idea but I think some fixing is needed: do you mean the first most common instead of the second most common? Swahili and Kiswahili can be merged, I think gilbertese should be accepted as a type-in for kiribati
I too like this quiz but I think there are still a few issues. The Bantu languages should probably be accepted either with or without their classifier prefixes: (Se)Tswana, (Ki)Rundi, (Ki)Tuba, (Kinya)Rwanda, (Chi)Chewa, (Chi)Bemba, (Chi)Shona.
There are also some languages here that are not the most common mother tongue in the country. Latin is no one's mother tongue, and either Italian or German (because of the Swiss Guards) is the most common mother tongue of its residents. Punjabi is the native language of almost half of all Pakistanis, although most of them learn Urdu at some point. Brunei Malay and Tetum Dili are really just dialects of Malay and Tetum, and are certainly closer to their standard dialects than, say, the Arab dialects. Tigrinya should be accepted for Tigrigna, Persian for Farsi, and Azeri for Azerbaijani.
Most common language in Montenegro is Serbian. At the 2011 census, 42% of the population declared Serbian to be their native language, while 37% declared it to be Montenegrin.
Alemannic is a German dialect. Thus, the most widely spoken language of Liechtenstein is German. Same actually applies to Luxembourgish (in a linguistic sense, but they have an own standard variety). For both (Alemannic and Luxembourgish) German should be accepted.
Farsi, Dari and Tajiki are all basically Persian.
Serbian, Croatian, Bosnian and Montenegrin are all the same language (Serbo-Croatian).
In Belize, I was told that the creole spoken in Belize is spelt "Kriol." I tried typing in variations, but no dice. I think all of the creole answers in the quiz need to have variations available, as those languages are often given different names by different people.
There are also some languages here that are not the most common mother tongue in the country. Latin is no one's mother tongue, and either Italian or German (because of the Swiss Guards) is the most common mother tongue of its residents. Punjabi is the native language of almost half of all Pakistanis, although most of them learn Urdu at some point. Brunei Malay and Tetum Dili are really just dialects of Malay and Tetum, and are certainly closer to their standard dialects than, say, the Arab dialects. Tigrinya should be accepted for Tigrigna, Persian for Farsi, and Azeri for Azerbaijani.
Also, I tried English, French, and Creole... none of which were accepted for Jamaica, etc. Had no idea what you wanted.
I won't list them all but here are a few;
-The most spoken language in Liechtenstein is German
-Persian should be accepted as well as Farsi
-'Brunei' isn't a language (84% speak Malay)
-Tswana should be accepted
-They speak primarily Spanish in equatorial guinea
-Tigrigna is incorrect, should be tigrinya
-French is the most widely spoken language in DRC
-Romanians speak Romanian, not Russian
-Latin is not the most common language in the vatican
I didn't write down all the mistakes, there are a few more.
Otherwise a very good quiz, great effort!!
Farsi, Dari and Tajiki are all basically Persian.
Serbian, Croatian, Bosnian and Montenegrin are all the same language (Serbo-Croatian).
Bulgarian and Macedonian are the same language.