| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,155 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,069 |
| States of Germany | 0 | - | 4.95 | 153,034 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,229 |
| History of Germany | 0 | - | 4.39 | 52,884 |
| Germany Country Quiz | 0 | - | 4.83 | 158,118 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,254 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 42,023 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,448 |
| Counties of England | 0 | - | 4.97 | 798,435 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,396 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,626 |
| Geography of the British Empire | 0 | - | 4.48 | 39,730 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,660 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,081 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,005 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,255 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,082 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,730 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,059 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,944 |
| Regions of Italy | 0 | - | 4.92 | 76,170 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,373 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,264 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,373 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,110 |
| Medieval English History | 0 | - | 4.53 | 43,561 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,030 |
| French History Multiple Choice | 0 | - | 4.55 | 33,109 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,445 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,259 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,553 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,752 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,058 |
| Departments of France | 0 | - | 4.93 | 54,388 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,556 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,524 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,585 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,262 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,599 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,071 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,984 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,916 |
| Name the English Monarchs | 0 | - | 4.91 | 503,657 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,775 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,180 |
| England or Wales? | 0 | - | 4.94 | 45,775 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,804 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,203 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,294 |
| History of Scotland | 0 | - | 4.51 | 21,116 |
| Kings of France Quiz | 0 | - | 4.20 | 32,802 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,672 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,163 |
| German Inventions | 0 | - | 3.91 | 30,246 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,647 |
| The Trojan War | 0 | - | 4.83 | 39,782 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,533 |
| Name that Greek Letter | 0 | - | 4.93 | 324,090 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,125 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,626 |
| Roman Emperors | 0 | - | 4.95 | 120,315 |
| Malta Country Quiz | 0 | - | 4.81 | 31,100 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,042 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,443 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,912 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,599 |
| The Only European Country ... | 0 | - | 4.91 | 217,243 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,476 |
| History of Russia Quiz | 0 | - | 4.47 | 31,943 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,394 |
| History of Italy | 0 | - | 4.55 | 32,040 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,714 |
| History of The Netherlands | 0 | - | 4.46 | 17,469 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,287 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,936 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,205 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,199 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,994 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,513 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,247,480 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,298 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,858 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,374 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,214 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,318 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,099 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,657 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,503 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,349 |
| Slavic Countries | 0 | - | 4.96 | 111,830 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,498 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,625 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,644 |
| Ancient Greek Words | 0 | - | 4.93 | 111,836 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,732 |
| History of London | 0 | - | 4.33 | 26,213 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 357,748 |
| Regions of France | 0 | - | 4.72 | 121,130 |
| France Immigration by Country | 0 | - | 4.70 | 76,648 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,122 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,752 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,239 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,467 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,327 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,011 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,389 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,676 |
| Champions League Winners | 0 | - | 4.91 | 1,009,225 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,010 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,779 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,613 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,945 |
| Monarchies of Europe | 0 | - | 4.90 | 98,300 |
| European Countries with One Border | 0 | - | 4.97 | 183,052 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,824 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 82,120 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,863 |
| Countries That Border Russia | 0 | - | 4.98 | 462,621 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,041 |
| History of Austria | 0 | - | 4.70 | 17,894 |
| Austria Country Quiz | 0 | - | 4.57 | 59,818 |
| Belgium Country Quiz | 0 | - | 4.72 | 71,909 |
| France Country Quiz | 0 | - | 4.70 | 135,134 |
| French Inventions | 0 | - | 4.10 | 13,905 |
| Geography of the French Empire | 0 | - | 4.45 | 27,149 |
| The French Revolution | 0 | - | 4.47 | 24,050 |
| Countries Bordering France | 0 | - | 4.83 | 403,346 |
| History of Paris | 0 | - | 4.24 | 13,657 |
| History of France | 0 | - | 4.59 | 57,228 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,902 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,362 |
| Greece Country Quiz | 0 | - | 4.74 | 66,347 |
| Italy Country Quiz | 0 | - | 4.77 | 123,559 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,122 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,812 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,555 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,621 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,525 |
| The Vikings! | 0 | - | 4.46 | 28,366 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,197 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,991 |
| The Portuguese Empire | 0 | - | 4.58 | 12,081 |
| Spain Country Quiz | 0 | - | 4.44 | 128,726 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,432 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,072 |
| United Kingdom A-Z | 0 | - | 4.52 | 88,123 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,761 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,358 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,734 |
| Counties of Wales | 0 | - | 4.63 | 39,361 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,038 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,265 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,190 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,770 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,250 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,501 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,785 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,964 |
| Russia Country Quiz | 0 | - | 4.83 | 114,652 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,442 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,401 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,851 |
| German History A-Z | 0 | - | 4.49 | 24,648 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,824 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,465 |
| History of Ireland | 0 | - | 4.39 | 31,264 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,396 |
| Byzantine History | 0 | - | 4.91 | 28,907 |
| Byzantine Emperors | 0 | - | 4.92 | 14,337 |
| Canary Islands | 0 | - | 4.62 | 17,490 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,213 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,801 |
| British Spellings | 0 | - | 4.06 | 99,493 |
| British Groups of Things | 0 | - | 4.25 | 82,901 |
| British Acronyms | 0 | - | 4.40 | 45,837 |
| UK Immigration by Country | 0 | - | 4.94 | 141,099 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,051 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,096 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,345 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,916 |
| Geography of Scotland | 0 | - | 4.63 | 21,645 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,881 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,706,032 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,009 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,167 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,669 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,483 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,474 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,586 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,304 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,379 |
| Countries that Border Poland | 0 | - | 4.99 | 172,543 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,946 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,011 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,359 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,379 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,917 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,868 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,616 |
