| Name the English Monarchs | 0 | - | 4.92 | 499,554 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,704 |
| The Trojan War | 0 | - | 4.83 | 39,532 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,020 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,221 |
| Roman Emperors | 0 | - | 4.95 | 119,032 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,771 |
| Germany Country Quiz | 0 | - | 4.82 | 157,026 |
| England or Wales? | 0 | - | 4.94 | 45,451 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,153 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,578 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,289 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,756 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,025 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,882 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,737 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,849 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,823 |
| Medieval English History | 0 | - | 4.53 | 43,372 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,393 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,747 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,855 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,404 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,283 |
| Countries Bordering France | 0 | - | 4.83 | 400,809 |
| French History Multiple Choice | 0 | - | 4.55 | 32,929 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,070 |
| States of Germany | 0 | - | 4.96 | 150,848 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,274 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,165 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,517 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,602 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,754 |
| Roman Names for Places | 0 | - | 4.62 | 58,011 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,665 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,418 |
| Europe Map Quiz | 0 | - | 5.00 | 4,742,062 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,594 |
| Departments of France | 0 | - | 4.93 | 53,157 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,470 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,985 |
| Italy Country Quiz | 0 | - | 4.82 | 122,576 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,730 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,377 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,418 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,320 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,945 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,710 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,265 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,607 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,973 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,665 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,943 |
| Counties of Ireland | 0 | - | 4.92 | 193,796 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,601 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,784 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,097 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,268 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,165 |
| History of Scotland | 0 | - | 4.51 | 21,032 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,990 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,960 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,194 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,497 |
| Kings of France Quiz | 0 | - | 4.20 | 32,613 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,803 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,704 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,416 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,676 |
| German Inventions | 0 | - | 3.91 | 30,199 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,590 |
| The Life of Alexander the Great | 0 | - | 4.49 | 18,447 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,952 |
| Name that Greek Letter | 0 | - | 4.93 | 322,309 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,110 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,076 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,127 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,895 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,621 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,742 |
| English Royal Consorts | 0 | - | 4.37 | 37,246 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,698 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,009 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,135 |
| The Only European Country ... | 0 | - | 4.91 | 214,825 |
| European Countries NOT in NATO | 0 | - | 4.87 | 60,124 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,840 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,907 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,232,741 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,322,512 |
| History of Russia Quiz | 0 | - | 4.49 | 31,829 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,393 |
| History of Germany | 0 | - | 4.39 | 52,697 |
| Ancient Greek Words | 0 | - | 4.93 | 111,006 |
| History of Italy | 0 | - | 4.55 | 31,877 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,544 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,069 |
| Counties of England | 0 | - | 4.97 | 791,763 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,682 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,655 |
| History of London | 0 | - | 4.33 | 26,118 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,290 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 351,997 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,030 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,613 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,120 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,690 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,036 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 169,126 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,614 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,415 |
| Slavic Countries | 0 | - | 4.96 | 111,142 |
| Most Popular Baby Boy Names in Germany | 0 | - | 4.34 | 66,964 |
| Ancient Greece A-Z | 0 | - | 4.60 | 23,063 |
| Ancient Greek Inventions | 0 | - | 4.17 | 16,306 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,774 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,781 |
| UK Cities Map Quiz | 0 | - | 4.95 | 463,004 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,654 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,452 |
| Champions League Winners | 0 | - | 4.92 | 999,742 |
| Australia... or New Zealand? | 0 | - | 4.83 | 61,236 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,570 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,261 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,778 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,345 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,137 |
| Monarchies of Europe | 0 | - | 4.90 | 97,599 |
| European Countries with One Border | 0 | - | 4.97 | 181,996 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,879 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,594 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,967 |
| Countries That Border Russia | 0 | - | 4.98 | 460,034 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,441 |
| History of Austria | 0 | - | 4.70 | 17,788 |
| Austria Country Quiz | 0 | - | 4.57 | 59,491 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,426 |
| France Country Quiz | 0 | - | 4.70 | 134,389 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,635 |
| Geography of the French Empire | 0 | - | 4.45 | 26,983 |
| The French Revolution | 0 | - | 4.46 | 23,847 |
| History of France | 0 | - | 4.59 | 56,493 |
| French History A-Z | 0 | - | 4.22 | 24,300 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,531 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,061 |
| Greece Country Quiz | 0 | - | 4.74 | 65,922 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,627 |
| Regions of Italy | 0 | - | 4.92 | 75,049 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,579 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,334 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,164 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 44,041 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,920 |
| The Vikings! | 0 | - | 4.46 | 28,275 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,796 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,527 |
| The Portuguese Empire | 0 | - | 4.58 | 12,019 |
| Spain Country Quiz | 0 | - | 4.45 | 127,938 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,993 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,084 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,637 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,260 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,378 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,614 |
| Which Country of the United Kingdom? | 0 | - | 4.58 | 39,145 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,250 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,252 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,034 |
| Geography of the British Empire | 0 | - | 4.48 | 39,563 |
| Animals in British History | 0 | - | 4.44 | 25,917 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,603 |
| Counties of Wales | 0 | - | 4.63 | 39,039 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,214 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,669,481 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,641 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,526 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,404 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,893 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,040 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,057 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,479 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,354 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,871 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,354 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,192 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,728 |
| Countries that Border Poland | 0 | - | 4.99 | 171,691 |
| Russia Country Quiz | 0 | - | 4.85 | 113,947 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,520 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,296 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,024 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,886 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,151 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,995 |
| Austria... or Australia? | 0 | - | 4.68 | 104,049 |
| Famous Germans by Picture | 0 | - | 4.12 | 16,781 |
| German History A-Z | 0 | - | 4.49 | 24,495 |
| History of Ireland | 0 | - | 4.39 | 30,958 |
| Italian History A-Z | 0 | - | 4.21 | 17,613 |
| Byzantine History | 0 | - | 4.91 | 28,676 |
