| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,862 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,088 |
| Geography of the French Empire | 0 | - | 4.45 | 27,019 |
| The French Revolution | 0 | - | 4.46 | 23,896 |
| Counties of England | 0 | - | 4.97 | 794,485 |
| History of France | 0 | - | 4.59 | 56,798 |
| History of Italy | 0 | - | 4.55 | 31,930 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,606 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,155 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,783 |
| Europe Map Quiz | 0 | - | 5.00 | 4,754,315 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,847 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,092 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,242 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,676 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,570 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,492 |
| States of Germany | 0 | - | 4.96 | 151,766 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,851 |
| Regions of Italy | 0 | - | 4.92 | 75,501 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 51,768 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,594 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,953 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,515 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,655 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,380 |
| Regions of France | 0 | - | 4.75 | 120,352 |
| France Immigration by Country | 0 | - | 4.70 | 76,377 |
| Departments of France | 0 | - | 4.93 | 53,720 |
| Countries Bordering France | 0 | - | 4.83 | 401,782 |
| French History Multiple Choice | 0 | - | 4.55 | 32,994 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,357 |
| History of Austria | 0 | - | 4.70 | 17,831 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,459 |
| The Vikings! | 0 | - | 4.46 | 28,316 |
| The Portuguese Empire | 0 | - | 4.58 | 12,045 |
| Name the English Monarchs | 0 | - | 4.91 | 501,287 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,703 |
| French Inventions | 0 | - | 4.08 | 13,889 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,776 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,075 |
| History of Paris | 0 | - | 4.24 | 13,634 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,303 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,274 |
| Geography of the British Empire | 0 | - | 4.48 | 39,627 |
| Malta Country Quiz | 0 | - | 4.81 | 30,992 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,450 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,871 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,760 |
| The Only European Country ... | 0 | - | 4.91 | 215,886 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,700 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 645,908 |
| Name that Greek Letter | 0 | - | 4.93 | 323,028 |
| History of The Netherlands | 0 | - | 4.46 | 17,403 |
| History of Russia Quiz | 0 | - | 4.49 | 31,878 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,031 |
| The Trojan War | 0 | - | 4.83 | 39,638 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,495 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,398 |
| Roman Emperors | 0 | - | 4.95 | 119,625 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,180 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,239,309 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,325,835 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,387 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,932 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,070 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,951 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,904 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 170,454 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,957 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,688 |
| Slavic Countries | 0 | - | 4.96 | 111,450 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,278 |
| History of Germany | 0 | - | 4.39 | 52,772 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,453 |
| History of Spain | 0 | - | 4.23 | 21,068 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,734 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,126 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 354,023 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,848 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,419 |
| Ancient Greek Words | 0 | - | 4.93 | 111,301 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,203 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,229 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,040 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,573 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,642 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,204 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,866 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,468 |
| Monarchies of Europe | 0 | - | 4.90 | 97,918 |
| European Countries with One Border | 0 | - | 4.97 | 182,463 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,274 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 77,858 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,199 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,695 |
| France Country Quiz | 0 | - | 4.70 | 134,713 |
| Movies Set in France | 0 | - | 4.26 | 13,110 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,891 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,084 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,983 |
| American to British Word Translation | 0 | - | 4.14 | 138,699 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,852 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,983 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,292 |
| Champions League Winners | 0 | - | 4.92 | 1,003,448 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,576 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,839 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,745 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,495 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,223 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,586 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 259,784 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,281 |
| Russia Country Quiz | 0 | - | 4.85 | 114,241 |
| Countries That Border Russia | 0 | - | 4.98 | 461,012 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,215 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,280 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,393 |
| Kings of France Quiz | 0 | - | 4.20 | 32,678 |
| Germany Country Quiz | 0 | - | 4.82 | 157,518 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,843 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,515 |
| Italy Country Quiz | 0 | - | 4.82 | 123,152 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,067 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,781 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,511 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,977 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,638 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,328 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,174 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,157 |
| England or Wales? | 0 | - | 4.94 | 45,589 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 129,677 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,564 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,640 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,310 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,140 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,925 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,874 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,353 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,235 |
| Canary Islands | 0 | - | 4.62 | 17,458 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,574 |
| British Spellings | 0 | - | 4.06 | 99,399 |
| British Groups of Things | 0 | - | 4.25 | 82,827 |
| British Acronyms | 0 | - | 4.39 | 45,751 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,012 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,989 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,649 |
| Geography of Scotland | 0 | - | 4.63 | 21,584 |
| Medieval English History | 0 | - | 4.53 | 43,450 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,686,840 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,470 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,027 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,264 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,328 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,722 |
| Countries that Border Poland | 0 | - | 4.99 | 172,020 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,698 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,117 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,074 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,790 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,727 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,225 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,609 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,166 |
| 20 Questions About France | 0 | - | 4.11 | 32,388 |
| Countries that Beat France | 0 | - | 4.49 | 75,596 |
| France True or False? | 0 | - | 4.43 | 39,897 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,088 |
| Geography of Germany | 0 | - | 4.35 | 17,157 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,996 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,438 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,599 |
| Counties of Ireland | 0 | - | 4.92 | 194,545 |
| Italian Inventions | 0 | - | 3.81 | 18,432 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,735 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,667 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,683 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,844 |
| Roman Names for Places | 0 | - | 4.62 | 58,160 |
| Byzantine History | 0 | - | 4.91 | 28,749 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,112 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,551 |
| British to American Word Translation | 0 | - | 3.74 | 254,986 |
| British Foods by Description | 0 | - | 3.94 | 48,310 |
| British and American Word Differences | 0 | - | 2.63 | 46,854 |
| English Inventions #1 | 0 | - | 3.15 | 23,551 |
| English Inventions #2 | 0 | - | 4.00 | 8,690 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,575 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,050 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,732 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,557 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,092 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,923 |
| Prime Ministers of the UK | 0 | - | 4.95 | 437,629 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,206 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,659 |
| Bridges of London | 0 | - | 4.17 | 10,090 |
