| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,731 |
| Regions of Italy | 0 | - | 4.92 | 75,139 |
| Counties of England | 0 | - | 4.97 | 792,209 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,262 |
| Roman Emperors | 0 | - | 4.95 | 119,178 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,554 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,087 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,704 |
| Europe Map Quiz | 0 | - | 5.00 | 4,744,507 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,493 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,817 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,919 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,464 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,336 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,706 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,110 |
| States of Germany | 0 | - | 4.96 | 150,993 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,329 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 44,084 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,118 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,696 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,308 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,613 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,287 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,221 |
| Italy Country Quiz | 0 | - | 4.82 | 122,634 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,774 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,425 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,431 |
| History of Austria | 0 | - | 4.70 | 17,794 |
| Geography of the French Empire | 0 | - | 4.45 | 26,991 |
| The French Revolution | 0 | - | 4.46 | 23,857 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,423 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,825 |
| The Vikings! | 0 | - | 4.46 | 28,282 |
| The Portuguese Empire | 0 | - | 4.58 | 12,027 |
| Name the English Monarchs | 0 | - | 4.92 | 499,937 |
| History of France | 0 | - | 4.59 | 56,572 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,625 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,066 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,855 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,022 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,258 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,075 |
| Geography of the British Empire | 0 | - | 4.48 | 39,574 |
| Malta Country Quiz | 0 | - | 4.81 | 30,922 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,838 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,139 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,239 |
| The Only European Country ... | 0 | - | 4.91 | 215,012 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,248 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,386 |
| Name that Greek Letter | 0 | - | 4.93 | 322,475 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,130 |
| History of The Netherlands | 0 | - | 4.46 | 17,353 |
| History of Russia Quiz | 0 | - | 4.49 | 31,837 |
| The Trojan War | 0 | - | 4.83 | 39,550 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,113 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,774 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,111 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,148 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,233,959 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,175 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,104 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,673 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,297 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,737 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,200 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 169,328 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,693 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,502 |
| Slavic Countries | 0 | - | 4.96 | 111,206 |
| French History Multiple Choice | 0 | - | 4.55 | 32,937 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,187 |
| History of Germany | 0 | - | 4.39 | 52,716 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,008 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,616 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,775 |
| Roman Names for Places | 0 | - | 4.62 | 58,040 |
| Byzantine History | 0 | - | 4.91 | 28,692 |
| History of Spain | 0 | - | 4.29 | 21,042 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,721 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,110 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 352,334 |
| Regions of France | 0 | - | 4.77 | 119,893 |
| France Immigration by Country | 0 | - | 4.72 | 76,165 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,702 |
| Ancient Greek Words | 0 | - | 4.93 | 111,066 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,034 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,146 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,810 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,497 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,603 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,314 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,873 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,452 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,211 |
| Monarchies of Europe | 0 | - | 4.90 | 97,669 |
| European Countries with One Border | 0 | - | 4.97 | 182,076 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,941 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,659 |
| Federal Subjects of Russia | 0 | - | 4.94 | 145,142 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,505 |
| French Inventions | 0 | - | 4.08 | 13,875 |
| History of Paris | 0 | - | 4.24 | 13,629 |
| Famous Ancient Romans | 0 | - | 4.69 | 85,245 |
| Italian Inventions | 0 | - | 3.81 | 18,424 |
| American to British Word Translation | 0 | - | 4.13 | 138,196 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,800 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,600 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,254 |
| Champions League Winners | 0 | - | 4.92 | 1,000,372 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,278 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,601 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,455 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,662 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,644 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,001 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,520 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,838 |
| Russia Country Quiz | 0 | - | 4.85 | 114,011 |
| Countries That Border Russia | 0 | - | 4.98 | 460,223 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,065 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,180 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,656 |
| Departments of France | 0 | - | 4.93 | 53,252 |
| Countries Bordering France | 0 | - | 4.83 | 401,009 |
| Germany Country Quiz | 0 | - | 4.82 | 157,132 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,515 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,931 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,411 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,134 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,371 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,007 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,795 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,129 |
| England or Wales? | 0 | - | 4.94 | 45,474 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 129,187 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,622 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,626 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,791 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,971 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,863 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,833 |
| Italian Foods | 0 | - | 4.31 | 72,430 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,015 |
| Canary Islands | 0 | - | 4.61 | 17,434 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,342 |
| British Spellings | 0 | - | 4.07 | 99,346 |
| British Groups of Things | 0 | - | 4.25 | 82,762 |
| British Acronyms | 0 | - | 4.39 | 45,694 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,990 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,775 |
| Geography of Scotland | 0 | - | 4.63 | 21,540 |
| Medieval English History | 0 | - | 4.53 | 43,390 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,672,589 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,718 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,919 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,073 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,098 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,432 |
| Countries that Border Poland | 0 | - | 4.99 | 171,752 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,548 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,451 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,915 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,717 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,646 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,040 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,624 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,521 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,010 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,687 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,964 |
| Geography of Germany | 0 | - | 4.35 | 17,133 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,305 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,222 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,530 |
| Roman to Greek God | 0 | - | 4.52 | 122,465 |
| Counties of Ireland | 0 | - | 4.92 | 193,950 |
| Italian History A-Z | 0 | - | 4.21 | 17,623 |
| Roman History Vocabulary | 0 | - | 4.40 | 57,521 |
| Roman History by Picture | 0 | - | 4.46 | 26,390 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,076 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,180 |
| British to American Word Translation | 0 | - | 3.74 | 254,899 |
| British Foods by Description | 0 | - | 3.94 | 48,289 |
| British and American Word Differences | 0 | - | 2.63 | 46,821 |
| English Inventions #1 | 0 | - | 3.15 | 23,533 |
| English Inventions #2 | 0 | - | 4.00 | 8,680 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,544 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,406 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,680 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,456 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,036 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,891 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,462 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,021 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,993 |
| Bridges of London | 0 | - | 4.17 | 10,074 |
| British Sport Trivia | 0 | - | 4.37 | 20,406 |
