| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,631 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,953 |
| States of Germany | 0 | - | 4.96 | 150,543 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,174 |
| History of Germany | 0 | - | 4.39 | 52,667 |
| Germany Country Quiz | 0 | - | 4.82 | 156,827 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,498 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,229 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,648 |
| Counties of England | 0 | - | 4.97 | 790,602 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,229 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,958 |
| Geography of the British Empire | 0 | - | 4.48 | 39,530 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,192 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,635 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,657 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,306 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,191 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,461 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,821 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,803 |
| Regions of Italy | 0 | - | 4.92 | 74,938 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,964 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,624 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,495 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,170 |
| Medieval English History | 0 | - | 4.53 | 43,350 |
| Europe Map Quiz | 0 | - | 5.00 | 4,737,757 |
| French History Multiple Choice | 0 | - | 4.55 | 32,906 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,490 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,117 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,219 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,422 |
| Departments of France | 0 | - | 4.93 | 53,031 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,359 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,830 |
| Italy Country Quiz | 0 | - | 4.82 | 122,431 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,595 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,281 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,402 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,225 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,831 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,561 |
| Name the English Monarchs | 0 | - | 4.92 | 498,934 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,702 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,089 |
| England or Wales? | 0 | - | 4.94 | 45,404 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,805 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,404 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,819 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,144 |
| History of Scotland | 0 | - | 4.51 | 21,021 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,462 |
| Kings of France Quiz | 0 | - | 4.20 | 32,589 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,585 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,587 |
| German Inventions | 0 | - | 3.91 | 30,192 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,585 |
| The Trojan War | 0 | - | 4.83 | 39,486 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,161 |
| Name that Greek Letter | 0 | - | 4.94 | 322,031 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,838 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,151 |
| Roman Emperors | 0 | - | 4.95 | 118,760 |
| Malta Country Quiz | 0 | - | 4.81 | 30,877 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,429 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,721 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,917 |
| The Only European Country ... | 0 | - | 4.91 | 214,421 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,910 |
| History of Russia Quiz | 0 | - | 4.49 | 31,812 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,656 |
| History of Italy | 0 | - | 4.55 | 31,858 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,517 |
| History of The Netherlands | 0 | - | 4.46 | 17,340 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,023 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,629 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,112 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,994 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,863 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,612 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,230,189 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,321,487 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,900 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,484 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,818 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,618 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 308,340 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 168,687 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,465 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,354 |
| Slavic Countries | 0 | - | 4.96 | 111,027 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,359 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,295 |
| Ancient Greek Words | 0 | - | 4.92 | 110,886 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,642 |
| History of London | 0 | - | 4.33 | 26,113 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 351,077 |
| Regions of France | 0 | - | 4.78 | 119,566 |
| France Immigration by Country | 0 | - | 4.72 | 76,055 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,593 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,334 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,710 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,927 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,099 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,705 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,121 |
| The UK for Americans - True or False | 0 | - | 4.44 | 58,447 |
| Champions League Winners | 0 | - | 4.92 | 998,221 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,502 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,174 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,612 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,140 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,986 |
| Monarchies of Europe | 0 | - | 4.90 | 97,491 |
| European Countries with One Border | 0 | - | 4.97 | 181,838 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,736 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,497 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,592 |
| Countries That Border Russia | 0 | - | 4.98 | 459,680 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,334 |
| History of Austria | 0 | - | 4.70 | 17,776 |
| Austria Country Quiz | 0 | - | 4.57 | 59,436 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,356 |
| France Country Quiz | 0 | - | 4.70 | 134,025 |
| French Inventions | 0 | - | 4.08 | 13,868 |
| Geography of the French Empire | 0 | - | 4.45 | 26,963 |
| The French Revolution | 0 | - | 4.46 | 23,824 |
| Countries Bordering France | 0 | - | 4.83 | 400,412 |
| History of Paris | 0 | - | 4.24 | 13,623 |
| History of France | 0 | - | 4.59 | 56,338 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,462 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,009 |
| Greece Country Quiz | 0 | - | 4.74 | 65,857 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,054 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,540 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,296 |
| Netherlands Country Quiz | 0 | - | 4.50 | 80,084 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,839 |
| The Vikings! | 0 | - | 4.46 | 28,263 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,756 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,471 |
| The Portuguese Empire | 0 | - | 4.54 | 12,005 |
| Spain Country Quiz | 0 | - | 4.45 | 127,796 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,030 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,360 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,332 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,594 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,231 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,578 |
| Counties of Wales | 0 | - | 4.63 | 39,004 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,090 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,399 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,275 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,004 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,624 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,531 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,577 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,499 |
| Russia Country Quiz | 0 | - | 4.85 | 113,815 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,967 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,112 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,683 |
| German History A-Z | 0 | - | 4.49 | 24,465 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,373 |
| History of Ireland | 0 | - | 4.39 | 30,911 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,051 |
| Byzantine History | 0 | - | 4.91 | 28,661 |
| Canary Islands | 0 | - | 4.61 | 17,420 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,171 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,256 |
| British Spellings | 0 | - | 4.07 | 99,299 |
| British Groups of Things | 0 | - | 4.25 | 82,727 |
| British Acronyms | 0 | - | 4.39 | 45,663 |
| UK Immigration by Country | 0 | - | 4.94 | 139,899 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,974 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,508 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,634 |
| Geography of Scotland | 0 | - | 4.63 | 21,510 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,804 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,663,511 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,493 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,844 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,613 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 137,953 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,410 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,964 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,171 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,864 |
| Countries that Border Poland | 0 | - | 4.99 | 171,562 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,463 |
| Countries that Beat Russia | 0 | - | 4.84 | 82,061 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,975 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,807 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,673 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,599 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,894 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,565 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,903 |
| 20 Questions About France | 0 | - | 4.11 | 32,350 |
