| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,976 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,360 |
| The French Revolution | 0 | - | 4.46 | 23,927 |
| Counties of England | 0 | - | 4.97 | 796,252 |
| History of France | 0 | - | 4.59 | 56,941 |
| History of Italy | 0 | - | 4.55 | 31,968 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,649 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,217 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,847 |
| Europe Map Quiz | 0 | - | 5.00 | 4,761,057 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,140 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,221 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,580 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,924 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,806 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,752 |
| States of Germany | 0 | - | 4.96 | 152,401 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,993 |
| Regions of Italy | 0 | - | 4.92 | 75,823 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,103 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,884 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,175 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,962 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,691 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,476 |
| Regions of France | 0 | - | 4.75 | 120,708 |
| France Immigration by Country | 0 | - | 4.70 | 76,483 |
| Departments of France | 0 | - | 4.93 | 54,045 |
| Countries Bordering France | 0 | - | 4.83 | 402,412 |
| French History Multiple Choice | 0 | - | 4.55 | 33,028 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,036 |
| History of Austria | 0 | - | 4.70 | 17,859 |
| The Vikings! | 0 | - | 4.46 | 28,341 |
| The Portuguese Empire | 0 | - | 4.58 | 12,062 |
| Name the English Monarchs | 0 | - | 4.91 | 502,365 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,761 |
| French Inventions | 0 | - | 4.08 | 13,896 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,853 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,158 |
| History of Paris | 0 | - | 4.24 | 13,645 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,343 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,432 |
| Geography of the British Empire | 0 | - | 4.48 | 39,664 |
| Malta Country Quiz | 0 | - | 4.81 | 31,043 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,908 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,333 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,142 |
| The Only European Country ... | 0 | - | 4.91 | 216,470 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,042 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,062 |
| Name that Greek Letter | 0 | - | 4.93 | 323,353 |
| History of The Netherlands | 0 | - | 4.46 | 17,428 |
| History of Russia Quiz | 0 | - | 4.47 | 31,913 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,161 |
| The Trojan War | 0 | - | 4.83 | 39,708 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,768 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,504 |
| Roman Emperors | 0 | - | 4.95 | 119,963 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,206 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,243,152 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,328,112 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,617 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,156 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,568 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,107 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,344 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,500 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,211 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,147 |
| Slavic Countries | 0 | - | 4.96 | 111,612 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,472 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,336 |
| History of Germany | 0 | - | 4.39 | 52,807 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,862 |
| History of Spain | 0 | - | 4.23 | 21,084 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,745 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,144 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,631 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,983 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,560 |
| Ancient Greek Words | 0 | - | 4.93 | 111,542 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,325 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,257 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,201 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,618 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,800 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,453 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,211 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,699 |
| Monarchies of Europe | 0 | - | 4.90 | 98,095 |
| European Countries with One Border | 0 | - | 4.97 | 182,715 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,516 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 78,332 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,013 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,856 |
| France Country Quiz | 0 | - | 4.70 | 134,931 |
| Movies Set in France | 0 | - | 4.26 | 13,118 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,942 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 74,080 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,100 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,109 |
| American to British Word Translation | 0 | - | 4.14 | 138,986 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,886 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,544 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,313 |
| Champions League Winners | 0 | - | 4.92 | 1,006,108 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,804 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,066 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,948 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,108 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,699 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,016 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,762 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,626 |
| Russia Country Quiz | 0 | - | 4.85 | 114,433 |
| Countries That Border Russia | 0 | - | 4.98 | 461,590 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,317 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,329 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,670 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,693 |
| Kings of France Quiz | 0 | - | 4.20 | 32,729 |
| Germany Country Quiz | 0 | - | 4.82 | 157,785 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,233 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,275 |
| Italy Country Quiz | 0 | - | 4.82 | 123,362 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,307 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,983 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,539 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,909 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,890 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,600 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,519 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,180 |
| England or Wales? | 0 | - | 4.94 | 45,668 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,251 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,321 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,654 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,862 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,236 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,979 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,907 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,835 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,309 |
| Canary Islands | 0 | - | 4.62 | 17,475 |
| Switzerland Immigration by Country | 0 | - | 4.68 | 29,684 |
| British Spellings | 0 | - | 4.06 | 99,442 |
| British Groups of Things | 0 | - | 4.25 | 82,861 |
| British Acronyms | 0 | - | 4.40 | 45,788 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,034 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,155 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,757 |
| Geography of Scotland | 0 | - | 4.63 | 21,613 |
| Medieval English History | 0 | - | 4.53 | 43,498 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,695,942 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,726 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,093 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,360 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,417 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,998 |
| Countries that Border Poland | 0 | - | 4.99 | 172,229 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,823 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,690 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,190 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,858 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,789 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,362 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,287 |
| 20 Questions About France | 0 | - | 4.11 | 32,406 |
| Countries that Beat France | 0 | - | 4.49 | 75,784 |
| France True or False? | 0 | - | 4.44 | 39,928 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,102 |
| Geography of Germany | 0 | - | 4.35 | 17,182 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,543 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,622 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,646 |
| Counties of Ireland | 0 | - | 4.92 | 195,125 |
| Italian Inventions | 0 | - | 3.81 | 18,437 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,843 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,974 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,729 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,910 |
| Roman Names for Places | 0 | - | 4.62 | 58,262 |
| Byzantine History | 0 | - | 4.91 | 28,841 |
| Byzantine Emperors | 0 | - | 4.94 | 13,874 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,154 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,892 |
| British to American Word Translation | 0 | - | 3.74 | 255,059 |
| British Foods by Description | 0 | - | 3.94 | 48,328 |
| British and American Word Differences | 0 | - | 2.63 | 46,875 |
| English Inventions #1 | 0 | - | 3.15 | 23,564 |
| English Inventions #2 | 0 | - | 4.00 | 8,699 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,588 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,598 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,783 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,645 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,134 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,951 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,657 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,619 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,804 |
