| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,000 |
| Regions of Italy | 0 | - | 4.92 | 75,851 |
| Counties of England | 0 | - | 4.97 | 796,589 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,521 |
| Roman Emperors | 0 | - | 4.95 | 120,015 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,656 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,233 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,857 |
| Europe Map Quiz | 0 | - | 5.00 | 4,762,449 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,200 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,667 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,645 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,981 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,861 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,401 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,800 |
| States of Germany | 0 | - | 4.96 | 152,529 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,023 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,140 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,924 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,186 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,987 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,693 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,488 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,746 |
| Italy Country Quiz | 0 | - | 4.82 | 123,390 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,349 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,545 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,152 |
| History of Austria | 0 | - | 4.70 | 17,861 |
| Geography of the French Empire | 0 | - | 4.45 | 27,057 |
| The French Revolution | 0 | - | 4.46 | 23,929 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,126 |
| The Vikings! | 0 | - | 4.46 | 28,342 |
| The Portuguese Empire | 0 | - | 4.58 | 12,064 |
| Name the English Monarchs | 0 | - | 4.91 | 502,558 |
| History of France | 0 | - | 4.59 | 56,967 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,856 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,104 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,027 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,048 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,349 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,461 |
| Geography of the British Empire | 0 | - | 4.48 | 39,670 |
| Malta Country Quiz | 0 | - | 4.81 | 31,054 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,998 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,427 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,219 |
| The Only European Country ... | 0 | - | 4.91 | 216,580 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,100 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,320 |
| Name that Greek Letter | 0 | - | 4.93 | 323,412 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,323 |
| History of The Netherlands | 0 | - | 4.46 | 17,431 |
| History of Russia Quiz | 0 | - | 4.47 | 31,914 |
| The Trojan War | 0 | - | 4.83 | 39,722 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,824 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,921 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,476 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,208 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,243,809 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,328,539 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,648 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,193 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,666 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,136 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,457 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,793 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,265 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,176 |
| Slavic Countries | 0 | - | 4.96 | 111,644 |
| French History Multiple Choice | 0 | - | 4.55 | 33,036 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,476 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,346 |
| History of Germany | 0 | - | 4.39 | 52,817 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,944 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,742 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,921 |
| Roman Names for Places | 0 | - | 4.62 | 58,277 |
| Byzantine History | 0 | - | 4.91 | 28,864 |
| Byzantine Emperors | 0 | - | 4.92 | 14,056 |
| History of Spain | 0 | - | 4.23 | 21,086 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,746 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,148 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,879 |
| Regions of France | 0 | - | 4.72 | 120,757 |
| France Immigration by Country | 0 | - | 4.70 | 76,505 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,005 |
| Ancient Greek Words | 0 | - | 4.93 | 111,583 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,351 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,264 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,235 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,626 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,839 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,501 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,283 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,739 |
| Monarchies of Europe | 0 | - | 4.90 | 98,133 |
| European Countries with One Border | 0 | - | 4.97 | 182,762 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,557 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 78,496 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,107 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,889 |
| French Inventions | 0 | - | 4.08 | 13,897 |
| History of Paris | 0 | - | 4.24 | 13,646 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,468 |
| Italian Inventions | 0 | - | 3.81 | 18,438 |
| American to British Word Translation | 0 | - | 4.14 | 139,040 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,891 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,602 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,320 |
| Champions League Winners | 0 | - | 4.92 | 1,006,552 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,851 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,101 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,985 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,219 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,788 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,100 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,938 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,692 |
| Russia Country Quiz | 0 | - | 4.85 | 114,468 |
| Countries That Border Russia | 0 | - | 4.98 | 461,697 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,333 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,339 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,682 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,722 |
| Departments of France | 0 | - | 4.93 | 54,087 |
| Countries Bordering France | 0 | - | 4.83 | 402,509 |
| Germany Country Quiz | 0 | - | 4.82 | 157,828 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,315 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,371 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,032 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,183 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,919 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,637 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,578 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,182 |
| England or Wales? | 0 | - | 4.94 | 45,683 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,320 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,472 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,654 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,939 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,257 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,993 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,911 |
| Italian Foods | 0 | - | 4.30 | 72,776 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,085 |
| Canary Islands | 0 | - | 4.62 | 17,479 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,698 |
| British Spellings | 0 | - | 4.06 | 99,448 |
| British Groups of Things | 0 | - | 4.25 | 82,862 |
| British Acronyms | 0 | - | 4.40 | 45,796 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,035 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,181 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,777 |
| Geography of Scotland | 0 | - | 4.63 | 21,614 |
| Medieval English History | 0 | - | 4.53 | 43,506 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,698,024 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,776 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,103 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,378 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,436 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,039 |
| Countries that Border Poland | 0 | - | 4.99 | 172,262 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,838 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,787 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,215 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,868 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,801 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,385 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,765 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,308 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,866 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,174 |
| Geography of Germany | 0 | - | 4.35 | 17,184 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,638 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,654 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,657 |
| Roman to Greek God | 0 | - | 4.52 | 122,806 |
| Counties of Ireland | 0 | - | 4.92 | 195,216 |
| Italian History A-Z | 0 | - | 4.21 | 17,706 |
| Roman History Vocabulary | 0 | - | 4.40 | 57,600 |
| Roman History by Picture | 0 | - | 4.46 | 26,464 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,162 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,965 |
| British to American Word Translation | 0 | - | 3.74 | 255,074 |
| British Foods by Description | 0 | - | 3.94 | 48,330 |
| British and American Word Differences | 0 | - | 2.63 | 46,879 |
| English Inventions #1 | 0 | - | 3.15 | 23,567 |
| English Inventions #2 | 0 | - | 4.00 | 8,700 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,592 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,664 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,790 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,656 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,141 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,959 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,877 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,644 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,828 |
| Bridges of London | 0 | - | 4.17 | 10,102 |
