In each group of four languages, three of them are in the same language family, and one is not; or they may all be in the same family but three of them are in the same branch and one is not. Pick the language that is unrelated to the others, or is less closely related.
To be clear: Don't look for a choice that doesn't fit the category. They all fit the category.
In an effort not to scare people away, I put the easier questions in the first quiz. That left these. Good luck!
All language classifications are according to Glottolog.
Keep scrolling down for answers and more stats ...
1. Languages of North Atlantic islands
Greenlandic is an Eskimo–Aleut language (of the Inuit branch). The others are Indo-European (of the North Germanic branch).
Greenlandic
Icelandic
Faroese
Norwegian
2. Languages of the Balkans
All are Indo-European languages. Albanian is its own branch. The others are of the South Slavic branch.
Serbian
Albanian
Macedonian
Bulgarian
3. Languages of the former Yugoslavia
All are Indo-European languages of the South Slavic branch (which is the meaning of the word Yugoslav). Bosnian, Croatian, and Serbian (and also Montenegrin) are different standardized dialects of the Serbo-Croatian language. Slovenian is a separate language.
Bosnian
Croatian
Slovenian
Serbian
4. Languages of Italy
All are Romance langauges. Sardinian is of the Southern Romance branch. The others are of the Italo-Western Romance branch.
Italian
Sardinian
Sicilian
Neapolitan
5. Languages of Mediterranean islands
Maltese is an Afro-Asiatic language (of the Semitic branch). The others are Indo-European.
Greek
Maltese
Sardinian
Sicilian
6. Languages of the ancient Near East
Sumerian is an isolate. The others are Afro-Asiatic.
Phoenician
Akkadian
Egyptian
Sumerian
7. Turkic languages
All are Turkic languages of the Common Turkic branch. Kazakh is of the Kipchak branch. The others are of the Oghuz branch.
Turkmen
Kazakh
Azerbaijani
Turkish
8. Languages of Pakistan
All are Indo-European languages of the Indo-Iranian branch. Pashto is of the Iranian branch. The others are of the Indo-Aryan branch.
Sindhi
Punjabi
Urdu
Pashto
9. Languages of the Horn of Africa
All are Afro-Asiatic languages. Amharic is of the Semitic branch. The others are of the Cushitic branch.
Oromo
Sidamo
Amharic
Somali
10. Languages of Kenya
Luo is a Nilotic language. The others are Atlantic–Congo languages (of the Bantu branch).
Luo
Swahili
Kamba
Kikuyu
11. Languages of the Mozambique Channel region
Malagasy is an Austronesian language, brought to Madagascar by people from the Malay Archipelago. The others are Atlantic–Congo languages (of the Bantu branch).
Swahili
Comorian
Malagasy
Makhuwa
12. Languages of Namibia
Khoekhoe is a Khoe–Kwadi language. The others are Atlantic–Congo languages (of the Bantu branch).
Khoekhoe
Herero
Kwangali
Ndonga
13. Languages of Indonesia
All are Austronesian languages, of the Malayo-Polynesian branch. Javanese is of the Javanesic branch. The others are of the Malayo-Sumbawan branch.
Sundanese
Malay (Indonesian)
Madurese
Javanese
14. Indigenous languages of Australia
Tiwi is an isolate. The others are Pama-Nyungan languages.
Arrernte
Warlpiri
Tiwi
Pitjantjatjara
15. Oceanic languages
All are Austronesian languages of the Oceanic branch. Fijian is its own branch within the Oceanic branch. The others are of the Polynesian branch.
Samoan
Fijian
Tongan
Māori
16. Indigenous languages of Alaska
Tlingit is a Athabaskan–Eyak–Tlingit (Na-Dene) language. The others are Eskimo–Aleut languages.
Inupiaq
Tlingit
Aleut
Yupik
17. Indigenous languages of Eastern Canada
Mohawk is an Iroquoian language. The others are Algic languages (of the Algonquian branch).
Ojibwe
Miꞌkmaq
Cree
Mohawk
18. Languages that share names with US states (more or less)
Miami-Illinois is an Algic language (of the Algonquian branch). The others are Siouan languages.
Kansa
Miami-Illinois
Dakota
Iowa-Otoe-Missouria
19. Indigenous languages of the southeastern United States
Cherokee is an Iroquoian language. The others are Muskogean languages.
Cherokee
Creek
Chickasaw
Choctaw
20. Indigenous languages of the southwestern United States
Navajo is a Athabaskan–Eyak–Tlingit (Na-Dene) language (of the Athabaskan branch). The others are Uto-Aztecan languages (of the Numic branch).
Navajo
Comanche
Shoshoni
Ute
21. Indigenous languages of Mexico and Guatemala
Nahuatl is a Uto-Aztecan language (of the Aztec branch). The others are Mayan languages.
Nahuatl
Qʼeqchiʼ
Yucatec Maya
Kʼicheʼ
22. Indigenous languages of Brazil
Kaingang is a Macro-Jê language (of the Jê branch). The others are Tupian languages (of the Tupi–Guarani branch)
Kaingang
Guarani
Tupi
Tenetehara
23. Languages that use the Geʽez (Ethiopic) script
All are Afro-Asiatic languages. Hadiyya is of the Cushitic branch. The others are of the Semitic branch.
I felt things were going alright during the first part of the quiz. Then, I got four languages I'd never heard of. It was still a great experience overall.