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
✓
Icelandic
✓
Norwegian
✓
Faroese
✓
Greenlandic is an Eskimo–Aleut language (of the Inuit branch). The others are Indo-European (of the North Germanic branch).
2.Languages of the Balkans
Serbian
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Albanian
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Macedonian
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Bulgarian
✓
All are Indo-European languages. Albanian is its own branch. The others are of the South Slavic branch.
3.Languages of the former Yugoslavia
Slovenian
✓
Croatian
✓
Serbian
✓
Bosnian
✓
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.
4.Languages of Italy
Sardinian
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Neapolitan
✓
Sicilian
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Italian
✓
All are Romance langauges. Sardinian is of the Southern Romance branch. The others are of the Italo-Western Romance branch.
5.Languages of Mediterranean islands
Sardinian
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Sicilian
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Greek
✓
Maltese
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Maltese is an Afro-Asiatic language (of the Semitic branch). The others are Indo-European.
6.Languages of the ancient Near East
Sumerian
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Phoenician
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Egyptian
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Akkadian
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Sumerian is an isolate. The others are Afro-Asiatic.
7.Turkic languages
Kazakh
✓
Turkish
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Azerbaijani
✓
Turkmen
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All are Turkic languages of the Common Turkic branch. Kazakh is of the Kipchak branch. The others are of the Oghuz branch.
8.Languages of Pakistan
Urdu
✓
Pashto
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Sindhi
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Punjabi
✓
All are Indo-European languages of the Indo-Iranian branch. Pashto is of the Iranian branch. The others are of the Indo-Aryan branch.
9.Languages of the Horn of Africa
Amharic
✓
Sidamo
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Oromo
✓
Somali
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All are Afro-Asiatic languages. Amharic is of the Semitic branch. The others are of the Cushitic branch.
10.Languages of Kenya
Kikuyu
✓
Swahili
✓
Luo
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Kamba
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Luo is a Nilotic language. The others are Atlantic–Congo languages (of the Bantu branch).
11.Languages of the Mozambique Channel region
Swahili
✓
Makhuwa
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Comorian
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Malagasy
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Malagasy is an Austronesian language, brought to Madagascar by people from the Malay Archipelago. The others are Atlantic–Congo languages (of the Bantu branch).
12.Languages of Namibia
Kwangali
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Khoekhoe
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Herero
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Ndonga
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Khoekhoe is a Khoe–Kwadi language. The others are Atlantic–Congo languages (of the Bantu branch).
13.Languages of Indonesia
Madurese
✓
Malay (Indonesian)
✓
Sundanese
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Javanese
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All are Austronesian languages, of the Malayo-Polynesian branch. Javanese is of the Javanesic branch. The others are of the Malayo-Sumbawan branch.
14.Indigenous languages of Australia
Arrernte
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Tiwi
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Pitjantjatjara
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Warlpiri
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Tiwi is an isolate. The others are Pama-Nyungan languages.
15.Oceanic languages
Tongan
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Fijian
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Māori
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Samoan
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All are Austronesian languages of the Oceanic branch. Fijian is its own branch within the Oceanic branch. The others are of the Polynesian branch.
16.Indigenous languages of Alaska
Yupik
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Aleut
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Inupiaq
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Tlingit
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Tlingit is a Athabaskan–Eyak–Tlingit (Na-Dene) language. The others are Eskimo–Aleut languages.
17.Indigenous languages of Eastern Canada
Mohawk
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Ojibwe
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Cree
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Miꞌkmaq
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Mohawk is an Iroquoian language. The others are Algic languages (of the Algonquian branch).
18.Languages that share names with US states (more or less)
Miami-Illinois
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Dakota
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Kansa
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Iowa-Otoe-Missouria
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Miami-Illinois is an Algic language (of the Algonquian branch). The others are Siouan languages.
19.Indigenous languages of the southeastern United States
Creek
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Cherokee
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Chickasaw
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Choctaw
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Cherokee is an Iroquoian language. The others are Muskogean languages.
20.Indigenous languages of the southwestern United States
Comanche
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Navajo
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Ute
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Shoshoni
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Navajo is a Athabaskan–Eyak–Tlingit (Na-Dene) language (of the Athabaskan branch). The others are Uto-Aztecan languages (of the Numic branch).
21.Indigenous languages of Mexico and Guatemala
Qʼeqchiʼ
✓
Kʼicheʼ
✓
Nahuatl
✓
Yucatec Maya
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Nahuatl is a Uto-Aztecan language (of the Aztec branch). The others are Mayan languages.
22.Indigenous languages of Brazil
Guarani
✓
Kaingang
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Tupi
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Tenetehara
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Kaingang is a Macro-Jê language (of the Jê branch). The others are Tupian languages (of the Tupi–Guarani branch)
23.Languages that use the Geʽez (Ethiopic) script
Amharic
✓
Tigrinya
✓
Hadiyya
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Tigre
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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.
Edit: Now I can't find anything to prove that :(