| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,668 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,002 |
| States of Germany | 0 | - | 4.96 | 150,713 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,230 |
| History of Germany | 0 | - | 4.39 | 52,680 |
| Germany Country Quiz | 0 | - | 4.82 | 156,909 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,533 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,258 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,700 |
| Counties of England | 0 | - | 4.97 | 791,267 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,239 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,986 |
| Geography of the British Empire | 0 | - | 4.48 | 39,547 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,282 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,686 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,748 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,351 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,244 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,534 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,829 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,809 |
| Regions of Italy | 0 | - | 4.92 | 75,001 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 44,002 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,839 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,554 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,207 |
| Medieval English History | 0 | - | 4.53 | 43,356 |
| Europe Map Quiz | 0 | - | 5.00 | 4,739,997 |
| French History Multiple Choice | 0 | - | 4.55 | 32,917 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,625 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,130 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,237 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,489 |
| Departments of France | 0 | - | 4.93 | 53,091 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,408 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,906 |
| Italy Country Quiz | 0 | - | 4.82 | 122,495 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,666 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,322 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,409 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,279 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,879 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,617 |
| Name the English Monarchs | 0 | - | 4.92 | 499,233 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,710 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,099 |
| England or Wales? | 0 | - | 4.94 | 45,427 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,979 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,411 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,978 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,152 |
| History of Scotland | 0 | - | 4.51 | 21,030 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,484 |
| Kings of France Quiz | 0 | - | 4.20 | 32,599 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,666 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,619 |
| German Inventions | 0 | - | 3.91 | 30,196 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,587 |
| The Trojan War | 0 | - | 4.83 | 39,507 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,511 |
| Name that Greek Letter | 0 | - | 4.94 | 322,162 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,929 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,183 |
| Roman Emperors | 0 | - | 4.95 | 118,857 |
| Malta Country Quiz | 0 | - | 4.81 | 30,888 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,562 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,862 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,022 |
| The Only European Country ... | 0 | - | 4.91 | 214,642 |
| European Countries NOT in NATO | 0 | - | 4.87 | 60,016 |
| History of Russia Quiz | 0 | - | 4.49 | 31,824 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,796 |
| History of Italy | 0 | - | 4.55 | 31,868 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,528 |
| History of The Netherlands | 0 | - | 4.46 | 17,348 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,047 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,660 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,118 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,006 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,873 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,660 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,231,428 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,321,969 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,969 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,550 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,974 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,645 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 308,852 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 168,898 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,541 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,386 |
| Slavic Countries | 0 | - | 4.96 | 111,082 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,380 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,569 |
| Ancient Greek Words | 0 | - | 4.93 | 110,951 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,650 |
| History of London | 0 | - | 4.33 | 26,117 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 351,522 |
| Regions of France | 0 | - | 4.78 | 119,666 |
| France Immigration by Country | 0 | - | 4.72 | 76,092 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,625 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,555 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,740 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,952 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,107 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,856 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,323 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,457 |
| Champions League Winners | 0 | - | 4.92 | 998,974 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,530 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,218 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,701 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,236 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,064 |
| Monarchies of Europe | 0 | - | 4.90 | 97,549 |
| European Countries with One Border | 0 | - | 4.97 | 181,915 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,815 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,534 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,800 |
| Countries That Border Russia | 0 | - | 4.98 | 459,865 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,376 |
| History of Austria | 0 | - | 4.70 | 17,780 |
| Austria Country Quiz | 0 | - | 4.57 | 59,460 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,391 |
| France Country Quiz | 0 | - | 4.70 | 134,139 |
| French Inventions | 0 | - | 4.08 | 13,871 |
| Geography of the French Empire | 0 | - | 4.45 | 26,973 |
| The French Revolution | 0 | - | 4.46 | 23,836 |
| Countries Bordering France | 0 | - | 4.83 | 400,623 |
| History of Paris | 0 | - | 4.24 | 13,626 |
| History of France | 0 | - | 4.59 | 56,422 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,501 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,036 |
| Greece Country Quiz | 0 | - | 4.74 | 65,884 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,057 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,561 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,315 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,128 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,906 |
| The Vikings! | 0 | - | 4.46 | 28,269 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,775 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,506 |
| The Portuguese Empire | 0 | - | 4.58 | 12,009 |
| Spain Country Quiz | 0 | - | 4.45 | 127,864 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,055 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,427 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,361 |
| 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 | 17,584 |
| Counties of Wales | 0 | - | 4.63 | 39,016 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,141 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,461 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,336 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,225 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,764 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,680 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,866 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,611 |
| Russia Country Quiz | 0 | - | 4.85 | 113,866 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,988 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,124 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,695 |
| German History A-Z | 0 | - | 4.49 | 24,482 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,496 |
| History of Ireland | 0 | - | 4.39 | 30,935 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,082 |
| Byzantine History | 0 | - | 4.91 | 28,670 |
| Canary Islands | 0 | - | 4.61 | 17,426 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,254 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,296 |
| British Spellings | 0 | - | 4.07 | 99,322 |
| British Groups of Things | 0 | - | 4.25 | 82,738 |
| British Acronyms | 0 | - | 4.39 | 45,669 |
| UK Immigration by Country | 0 | - | 4.94 | 139,953 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,980 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,598 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,684 |
| Geography of Scotland | 0 | - | 4.63 | 21,517 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,927 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,666,296 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,564 |
| 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 | 113,549 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,018 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,259 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,903 |
| Countries that Border Poland | 0 | - | 4.99 | 171,614 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,484 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,112 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,122 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,847 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,683 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,614 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,944 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,580 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,938 |
| 20 Questions About France | 0 | - | 4.11 | 32,352 |
