| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,919 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,250 |
| Geography of the French Empire | 0 | - | 4.45 | 27,039 |
| The French Revolution | 0 | - | 4.46 | 23,918 |
| Counties of England | 0 | - | 4.97 | 795,453 |
| History of France | 0 | - | 4.59 | 56,899 |
| History of Italy | 0 | - | 4.55 | 31,954 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,634 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,187 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,817 |
| Europe Map Quiz | 0 | - | 5.00 | 4,758,097 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,005 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 79,473 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,416 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,810 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,714 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,657 |
| States of Germany | 0 | - | 4.96 | 152,134 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,941 |
| Regions of Italy | 0 | - | 4.92 | 75,690 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,005 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,751 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,096 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,909 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,675 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,438 |
| Regions of France | 0 | - | 4.75 | 120,552 |
| France Immigration by Country | 0 | - | 4.70 | 76,445 |
| Departments of France | 0 | - | 4.93 | 53,939 |
| Countries Bordering France | 0 | - | 4.83 | 402,122 |
| French History Multiple Choice | 0 | - | 4.55 | 33,010 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,775 |
| History of Austria | 0 | - | 4.70 | 17,847 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,466 |
| The Vikings! | 0 | - | 4.46 | 28,333 |
| The Portuguese Empire | 0 | - | 4.58 | 12,054 |
| Name the English Monarchs | 0 | - | 4.91 | 501,902 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,737 |
| French Inventions | 0 | - | 4.08 | 13,891 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,815 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,121 |
| History of Paris | 0 | - | 4.24 | 13,643 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,318 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,370 |
| Geography of the British Empire | 0 | - | 4.48 | 39,640 |
| Malta Country Quiz | 0 | - | 4.81 | 31,021 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,711 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,171 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,972 |
| The Only European Country ... | 0 | - | 4.91 | 216,220 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,900 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,573 |
| Name that Greek Letter | 0 | - | 4.93 | 323,231 |
| History of The Netherlands | 0 | - | 4.46 | 17,421 |
| History of Russia Quiz | 0 | - | 4.49 | 31,898 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,103 |
| The Trojan War | 0 | - | 4.83 | 39,672 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,647 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,455 |
| Roman Emperors | 0 | - | 4.95 | 119,761 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,195 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,241,503 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,326,975 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,514 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,062 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,353 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,047 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,136 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 170,994 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,106 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,914 |
| Slavic Countries | 0 | - | 4.96 | 111,543 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,311 |
| History of Germany | 0 | - | 4.39 | 52,792 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,681 |
| History of Spain | 0 | - | 4.23 | 21,073 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,742 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,139 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,051 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,925 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,115 |
| Ancient Greek Words | 0 | - | 4.93 | 111,438 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,281 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,243 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,134 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,602 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,735 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,349 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,063 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,599 |
| Monarchies of Europe | 0 | - | 4.90 | 98,016 |
| European Countries with One Border | 0 | - | 4.97 | 182,599 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,418 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,086 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,649 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,789 |
| France Country Quiz | 0 | - | 4.70 | 134,854 |
| Movies Set in France | 0 | - | 4.26 | 13,118 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,922 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,091 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,047 |
| American to British Word Translation | 0 | - | 4.14 | 138,857 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,871 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,139 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,301 |
| Champions League Winners | 0 | - | 4.92 | 1,005,132 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,703 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,006 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,862 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,849 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,483 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,862 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,368 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,477 |
| Russia Country Quiz | 0 | - | 4.85 | 114,358 |
| Countries That Border Russia | 0 | - | 4.98 | 461,343 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,279 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,314 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,641 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,557 |
| Kings of France Quiz | 0 | - | 4.20 | 32,695 |
| Germany Country Quiz | 0 | - | 4.82 | 157,689 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,978 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,784 |
| Italy Country Quiz | 0 | - | 4.82 | 123,278 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,191 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,876 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,529 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,569 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,790 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,478 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,368 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,172 |
| England or Wales? | 0 | - | 4.94 | 45,629 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,060 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,089 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,647 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,680 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,198 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,956 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,886 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,599 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,280 |
| Canary Islands | 0 | - | 4.62 | 17,470 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,639 |
| British Spellings | 0 | - | 4.06 | 99,422 |
| British Groups of Things | 0 | - | 4.25 | 82,844 |
| British Acronyms | 0 | - | 4.40 | 45,774 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,026 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,093 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,719 |
| Geography of Scotland | 0 | - | 4.63 | 21,603 |
| Medieval English History | 0 | - | 4.53 | 43,482 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,691,676 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,620 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,071 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,314 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,381 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,900 |
| Countries that Border Poland | 0 | - | 4.99 | 172,137 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,766 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,453 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,134 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,824 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,759 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,310 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,228 |
| 20 Questions About France | 0 | - | 4.11 | 32,402 |
| Countries that Beat France | 0 | - | 4.49 | 75,679 |
| France True or False? | 0 | - | 4.44 | 39,924 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,094 |
| Geography of Germany | 0 | - | 4.35 | 17,173 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,322 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,546 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,625 |
| Counties of Ireland | 0 | - | 4.92 | 194,911 |
| Italian Inventions | 0 | - | 3.81 | 18,435 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,794 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,846 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,710 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,876 |
| Roman Names for Places | 0 | - | 4.62 | 58,222 |
| Byzantine History | 0 | - | 4.91 | 28,770 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,138 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,771 |
| British to American Word Translation | 0 | - | 3.74 | 255,029 |
| British Foods by Description | 0 | - | 3.94 | 48,319 |
| British and American Word Differences | 0 | - | 2.63 | 46,861 |
| English Inventions #1 | 0 | - | 3.15 | 23,560 |
| English Inventions #2 | 0 | - | 4.00 | 8,696 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,585 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,382 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,757 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,612 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,114 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,931 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,253 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,579 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,751 |
| Bridges of London | 0 | - | 4.17 | 10,097 |
