| English Monarchs Quiz | 0 | - | 4.92 | 484,766 |
| The Trojan War | 0 | - | 4.81 | 38,557 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.83 | 106,574 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 82,560 |
| Roman Emperors | 0 | - | 4.96 | 112,519 |
| Countries Bordering Germany | 0 | - | 4.99 | 360,858 |
| States of the German Confederation in 1848 | 0 | - | 4.88 | 30,301 |
| Germany Country Quiz | 0 | - | 4.82 | 153,180 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 86,937 |
| Countries that Beat Germany | 0 | - | 4.95 | 102,616 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 31,752 |
| Ancient Greek Trivia | 0 | - | 4.61 | 65,997 |
| Medieval English History | 0 | - | 4.53 | 42,787 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 145,616 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 72,670 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.94 | 60,220 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 67,640 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 53,993 |
| Countries Bordering France | 0 | - | 4.87 | 380,427 |
| States of Germany Map Quiz | 0 | - | 4.91 | 128,805 |
| States of Germany | 0 | - | 4.95 | 143,532 |
| Germany Immigration by Country | 0 | - | 4.86 | 77,753 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.58 | 69,574 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 40,849 |
| Ancient Roman Trivia #2 | 0 | - | 4.56 | 37,941 |
| Geography of the Roman Empire | 0 | - | 4.56 | 50,991 |
| Roman Names for Places | 0 | - | 4.69 | 56,640 |
| Houses of British Monarchs | 0 | - | 4.52 | 64,323 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,404 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,453 |
| Europe Map Quiz | 0 | - | 5.00 | 4,643,407 |
| France Cities Map Quiz | 0 | - | 4.96 | 161,616 |
| Departments of France | 0 | - | 4.92 | 48,452 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 122,498 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 69,237 |
| Italy Country Quiz | 0 | - | 4.81 | 119,324 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 145,161 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 148,202 |
| Countries Surrounding Rome | 0 | - | 4.97 | 48,779 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 94,169 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 181,014 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 112,879 |
| England or Wales? | 0 | - | 4.94 | 44,323 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.70 | 57,197 |
| French Geography Quiz #1 | 0 | - | 4.88 | 33,775 |
| Countries Bordering Austria | 0 | - | 4.97 | 115,894 |
| Countries that Visit France the Most | 0 | - | 4.84 | 43,933 |
| Countries Closest to Metropolitan France | 0 | - | 4.88 | 70,574 |
| Geography of Ancient Greece | 0 | - | 4.77 | 31,372 |
| Countries Bordering Italy | 0 | - | 4.94 | 99,038 |
| Countries Closest to Italy | 0 | - | 4.97 | 192,687 |
| Countries Closest to Spain | 0 | - | 4.96 | 220,933 |
| Counties of the UK and Ireland | 0 | - | 4.97 | 123,622 |
| History of Scotland | 0 | - | 4.51 | 20,718 |
| World Capitals Closest to London | 0 | - | 4.89 | 99,278 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 93,936 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 416,900 |
| Andorra Country Quiz | 0 | - | 4.89 | 30,621 |
| Kings of France Quiz | 0 | - | 4.20 | 32,073 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,034 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,115 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.42 | 23,081 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 32,960 |
| German Inventions | 0 | - | 3.91 | 30,051 |
| The Life of Alexander the Great | 0 | - | 4.49 | 18,177 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 625,629 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,351 |
| Countries that Beat Italy | 0 | - | 4.85 | 52,388 |
| Seven Hills of Rome | 0 | - | 4.69 | 9,003 |
| Greenland Country Quiz | 0 | - | 4.83 | 35,341 |
| Countries that Beat Portugal | 0 | - | 4.86 | 56,961 |
| Countries that Beat Spain | 0 | - | 4.94 | 61,263 |
| Commonwealth of Nations Countries | 0 | - | 4.93 | 233,121 |
| English Royal Consorts | 0 | - | 4.37 | 36,639 |
| The Reign of Queen Elizabeth I | 0 | - | 4.52 | 31,142 |
| Countries That Use the Euro | 0 | - | 4.97 | 96,779 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 356,729 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 108,841 |
| The Only European Country ... | 0 | - | 4.92 | 205,030 |
| European Countries NOT in NATO | 0 | - | 4.88 | 54,961 |
| Olympian Gods Quiz | 0 | - | 4.96 | 476,752 |
| Name that Greek Letter | 0 | - | 4.93 | 315,648 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 119,102 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,165,663 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,295,229 |
| French History Multiple Choice | 0 | - | 4.55 | 32,347 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 81,633 |
| History of Germany | 0 | - | 4.38 | 52,046 |
| Ancient Greek Words | 0 | - | 4.92 | 107,776 |
| Geography of the Dutch Empire | 0 | - | 4.68 | 33,988 |
| Countries of the Spanish Empire | 0 | - | 4.51 | 76,553 |
| Counties of England | 0 | - | 4.97 | 769,623 |
| Invasions of Great Britain | 0 | - | 4.51 | 58,647 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,319 |
| History of London | 0 | - | 4.33 | 25,851 |
| British History Quiz for Dummies | 0 | - | 4.70 | 76,644 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 336,305 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 188,724 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 147,610 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.95 | 209,554 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 84,705 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 303,184 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 156,191 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 85,491 |
| Eastern Europe Map Quiz | 0 | - | 4.90 | 124,095 |
| Slavic Countries | 0 | - | 4.96 | 108,721 |
| Most Popular Baby Boy Names in Germany | 0 | - | 4.34 | 66,366 |
| Ancient Greece A-Z | 0 | - | 4.60 | 22,540 |
| Ancient Greek Inventions | 0 | - | 4.19 | 16,103 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 423,965 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 54,063 |
| UK Cities Map Quiz | 0 | - | 4.95 | 456,391 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,273 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.29 | 24,209 |
| Champions League Winners | 0 | - | 4.91 | 971,900 |
| European Diaspora - Top 11 Countries | 0 | - | 4.89 | 92,561 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 132,961 |
| Three Band Flags of Europe | 0 | - | 4.97 | 187,134 |
| Pixelated Europe Map | 0 | - | 4.88 | 118,751 |
| Monarchies of Europe | 0 | - | 4.89 | 95,069 |
| European Countries with One Border | 0 | - | 4.97 | 178,253 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 174,684 |
| European Geography By Letter - B #2 | 0 | - | 4.82 | 72,348 |
| History of Russia Quiz | 0 | - | 4.49 | 31,472 |
| Federal Subjects of Russia | 0 | - | 4.95 | 136,975 |
| Countries That Border Russia | 0 | - | 4.98 | 451,861 |
| Countries Formerly in Yugoslavia | 0 | - | 4.96 | 121,964 |
| History of Austria | 0 | - | 4.69 | 17,430 |
| Austria Country Quiz | 0 | - | 4.57 | 58,221 |
| Belgium Country Quiz | 0 | - | 4.65 | 69,778 |
| France Country Quiz | 0 | - | 4.70 | 131,478 |
| Regions of France Map Quiz | 0 | - | 4.96 | 139,601 |
| Geography of the French Empire | 0 | - | 4.51 | 26,503 |
| The French Revolution | 0 | - | 4.46 | 23,199 |
| History of France Quiz | 0 | - | 4.56 | 42,286 |
| French History A-Z | 0 | - | 4.20 | 15,427 |
| German Cities with the Most Tourists | 0 | - | 4.63 | 32,069 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 25,860 |
| Greece Country Quiz | 0 | - | 4.74 | 64,417 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,251 |
| Figures from Greek Mythology | 0 | - | 4.90 | 178,606 |
| Counties of Ireland | 0 | - | 4.89 | 181,663 |
| Regions of Italy | 0 | - | 4.91 | 71,051 |
| History of Italy | 0 | - | 4.54 | 31,449 |
| Embarrassing Chapters in Italian History | 0 | - | 4.23 | 11,834 |
| Luxembourg Country Quiz | 0 | - | 4.75 | 32,743 |
| Monaco Country Quiz | 0 | - | 4.47 | 40,470 |
| Netherlands Country Quiz | 0 | - | 4.52 | 78,420 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 39,984 |
| Nordic Cities Map Quiz | 0 | - | 4.75 | 88,808 |
| The Vikings! | 0 | - | 4.46 | 28,001 |
| Sweden Immigration by Country | 0 | - | 4.54 | 54,713 |
| Portugal Country Quiz | 0 | - | 4.68 | 69,865 |
| The Portuguese Empire | 0 | - | 4.54 | 11,835 |
| Spain Country Quiz | 0 | - | 4.45 | 124,952 |
| Regions of Spain Quiz | 0 | - | 4.89 | 108,271 |
| Switzerland Country Quiz | 0 | - | 4.50 | 61,650 |
| Cantons of Switzerland | 0 | - | 4.97 | 47,441 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 91,081 |
| United Kingdom A-Z | 0 | - | 4.53 | 86,123 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,156 |
| Wives of King Henry VIII | 0 | - | 4.55 | 52,743 |
| Countries the UK Declared War On | 0 | - | 4.61 | 120,026 |
| Geography of the British Empire | 0 | - | 4.51 | 38,944 |
| Animals in British History | 0 | - | 4.43 | 25,557 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,001 |
| Counties of Wales | 0 | - | 4.63 | 37,673 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 103,131 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,546,914 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 185,896 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 189,659 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 123,948 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 69,994 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 136,507 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 63,014 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 224,055 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 268,330 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 159,961 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 86,044 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 245,966 |
| Name a Valid European Country #2 | 0 | - | 4.93 | 95,118 |
| Countries that Border Poland | 0 | - | 4.99 | 168,435 |
| Russia Country Quiz | 0 | - | 4.84 | 111,459 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 81,037 |
| Countries With the Most Russian Speakers | 0 | - | 4.95 | 73,896 |
| Countries that Border Hungary | 0 | - | 4.98 | 102,290 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 34,213 |
| Countries Bordering Serbia | 0 | - | 4.96 | 89,831 |
| Famous Germans by Picture | 0 | - | 4.11 | 16,506 |
| Italian History A-Z | 0 | - | 4.21 | 9,791 |
| Byzantine History | 0 | - | 4.91 | 28,018 |
| History of The Netherlands | 0 | - | 4.46 | 16,913 |
| Denmark Country Quiz | 0 | - | 4.75 | 74,178 |
| Finland Country Quiz | 0 | - | 4.50 | 57,767 |
| Norway Country Quiz | 0 | - | 4.45 | 74,767 |
| Iceland Country Quiz | 0 | - | 4.68 | 42,002 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 112,036 |
| Spanish History A-Z | 0 | - | 4.30 | 15,268 |
| Countries Bordering Spain | 0 | - | 4.50 | 68,061 |
| UK Immigration by Country | 0 | - | 4.93 | 136,633 |
