| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,670 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,014 |
| States of Germany | 0 | - | 4.96 | 150,721 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,232 |
| History of Germany | 0 | - | 4.39 | 52,681 |
| Germany Country Quiz | 0 | - | 4.82 | 156,917 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,535 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,259 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,701 |
| Counties of England | 0 | - | 4.97 | 791,308 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,242 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,991 |
| Geography of the British Empire | 0 | - | 4.48 | 39,547 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,291 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,691 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,754 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,354 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,245 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,547 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,832 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,811 |
| Regions of Italy | 0 | - | 4.92 | 75,003 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 44,003 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,844 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,559 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,213 |
| Medieval English History | 0 | - | 4.53 | 43,359 |
| Europe Map Quiz | 0 | - | 5.00 | 4,740,158 |
| French History Multiple Choice | 0 | - | 4.55 | 32,919 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,636 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,130 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,240 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,513 |
| Departments of France | 0 | - | 4.93 | 53,095 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,411 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,913 |
| Italy Country Quiz | 0 | - | 4.82 | 122,504 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,671 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,328 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,410 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,282 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,886 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,625 |
| Name the English Monarchs | 0 | - | 4.92 | 499,256 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,711 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,099 |
| England or Wales? | 0 | - | 4.94 | 45,431 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,991 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,411 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,981 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,153 |
| History of Scotland | 0 | - | 4.51 | 21,031 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,484 |
| Kings of France Quiz | 0 | - | 4.20 | 32,601 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,674 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,623 |
| German Inventions | 0 | - | 3.91 | 30,197 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,587 |
| The Trojan War | 0 | - | 4.83 | 39,510 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,538 |
| Name that Greek Letter | 0 | - | 4.94 | 322,168 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,941 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,183 |
| Roman Emperors | 0 | - | 4.95 | 118,858 |
| Malta Country Quiz | 0 | - | 4.81 | 30,889 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,572 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,876 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,031 |
| The Only European Country ... | 0 | - | 4.91 | 214,655 |
| European Countries NOT in NATO | 0 | - | 4.87 | 60,022 |
| History of Russia Quiz | 0 | - | 4.49 | 31,824 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,810 |
| History of Italy | 0 | - | 4.55 | 31,868 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,530 |
| History of The Netherlands | 0 | - | 4.46 | 17,348 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,050 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,660 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,119 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,007 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,874 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,663 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,231,516 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,322,004 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,974 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,550 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,982 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,648 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 308,870 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 168,917 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,544 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,390 |
| Slavic Countries | 0 | - | 4.96 | 111,085 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,383 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,585 |
| Ancient Greek Words | 0 | - | 4.93 | 110,956 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,650 |
| History of London | 0 | - | 4.33 | 26,118 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 351,570 |
| Regions of France | 0 | - | 4.78 | 119,675 |
| France Immigration by Country | 0 | - | 4.72 | 76,094 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,630 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,576 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,742 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,954 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,108 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,870 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,373 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,458 |
| Champions League Winners | 0 | - | 4.92 | 999,032 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,531 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,224 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,707 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,244 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,071 |
| Monarchies of Europe | 0 | - | 4.90 | 97,553 |
| European Countries with One Border | 0 | - | 4.97 | 181,919 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,820 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,535 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,809 |
| Countries That Border Russia | 0 | - | 4.98 | 459,878 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,377 |
| History of Austria | 0 | - | 4.70 | 17,780 |
| Austria Country Quiz | 0 | - | 4.57 | 59,463 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,392 |
| France Country Quiz | 0 | - | 4.70 | 134,171 |
| French Inventions | 0 | - | 4.08 | 13,871 |
| Geography of the French Empire | 0 | - | 4.45 | 26,973 |
| The French Revolution | 0 | - | 4.46 | 23,838 |
| Countries Bordering France | 0 | - | 4.83 | 400,644 |
| History of Paris | 0 | - | 4.24 | 13,627 |
| History of France | 0 | - | 4.59 | 56,425 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,503 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,038 |
| Greece Country Quiz | 0 | - | 4.74 | 65,888 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,057 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,564 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,315 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,129 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,906 |
| The Vikings! | 0 | - | 4.46 | 28,271 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,776 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,507 |
| The Portuguese Empire | 0 | - | 4.58 | 12,009 |
| Spain Country Quiz | 0 | - | 4.45 | 127,868 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,056 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,437 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,362 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,600 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,243 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,585 |
| Counties of Wales | 0 | - | 4.63 | 39,017 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,148 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,463 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,342 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,243 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,767 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,694 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,893 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,617 |
| Russia Country Quiz | 0 | - | 4.85 | 113,870 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,991 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,126 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,695 |
| German History A-Z | 0 | - | 4.49 | 24,483 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,507 |
| History of Ireland | 0 | - | 4.39 | 30,935 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,084 |
| Byzantine History | 0 | - | 4.91 | 28,670 |
| Canary Islands | 0 | - | 4.61 | 17,426 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,258 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,297 |
| British Spellings | 0 | - | 4.07 | 99,322 |
| British Groups of Things | 0 | - | 4.25 | 82,740 |
| British Acronyms | 0 | - | 4.39 | 45,670 |
| UK Immigration by Country | 0 | - | 4.94 | 139,959 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,980 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,609 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,690 |
| Geography of Scotland | 0 | - | 4.63 | 21,518 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,942 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,666,504 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,566 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,866 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,614 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,006 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,558 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,020 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,266 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,907 |
| Countries that Border Poland | 0 | - | 4.99 | 171,622 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,488 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,120 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,131 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,850 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,686 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,617 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,950 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,581 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,942 |
| 20 Questions About France | 0 | - | 4.11 | 32,353 |
