| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,303 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,436 |
| States of Germany | 0 | - | 4.95 | 153,812 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,462 |
| Counties of England | 0 | - | 4.97 | 800,603 |
| History of Italy | 0 | - | 4.55 | 32,098 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,763 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,359 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,021 |
| Europe Map Quiz | 0 | - | 5.00 | 4,777,815 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,991 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,388 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,385 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,527 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,308 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,087 |
| Regions of Italy | 0 | - | 4.92 | 76,536 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,589 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,848 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,539 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,307 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,792 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,667 |
| Germany Country Quiz | 0 | - | 4.83 | 158,485 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,169 |
| History of Germany | 0 | - | 4.39 | 52,932 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,932 |
| History of Austria | 0 | - | 4.70 | 17,942 |
| Geography of the French Empire | 0 | - | 4.45 | 27,187 |
| The French Revolution | 0 | - | 4.47 | 24,098 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,854 |
| The Vikings! | 0 | - | 4.46 | 28,386 |
| The Portuguese Empire | 0 | - | 4.58 | 12,090 |
| Name the English Monarchs | 0 | - | 4.91 | 504,965 |
| History of France | 0 | - | 4.61 | 57,420 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,883 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,656 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,429 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,055 |
| Geography of the British Empire | 0 | - | 4.48 | 39,800 |
| Malta Country Quiz | 0 | - | 4.81 | 31,170 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,102 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,539 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 116,543 |
| The Only European Country ... | 0 | - | 4.91 | 218,075 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,028 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,200 |
| Name that Greek Letter | 0 | - | 4.93 | 324,507 |
| History of The Netherlands | 0 | - | 4.46 | 17,512 |
| History of Russia Quiz | 0 | - | 4.47 | 31,977 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,985 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,381 |
| The Trojan War | 0 | - | 4.83 | 39,904 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,556 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,397 |
| Roman Emperors | 0 | - | 4.95 | 120,732 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,295 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,252,249 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,332,824 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,204 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,765 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,015 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,551 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,934 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 174,498 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,840 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,573 |
| Slavic Countries | 0 | - | 4.96 | 112,103 |
| French History Multiple Choice | 0 | - | 4.55 | 33,163 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,570 |
| Geography of Germany | 0 | - | 4.35 | 17,233 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,947 |
| History of Spain | 0 | - | 4.23 | 21,140 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,800 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,205 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 359,577 |
| Regions of France | 0 | - | 4.70 | 121,603 |
| France Immigration by Country | 0 | - | 4.70 | 76,793 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,281 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,654 |
| Ancient Greek Words | 0 | - | 4.93 | 112,152 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,585 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,371 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,588 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,743 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,373 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,248 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,128 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,057 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,196 |
| Monarchies of Europe | 0 | - | 4.90 | 98,544 |
| European Countries with One Border | 0 | - | 4.97 | 183,400 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,165 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 87,908 |
| Federal Subjects of Russia | 0 | - | 4.95 | 148,547 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,277 |
| French Inventions | 0 | - | 4.10 | 13,915 |
| History of Paris | 0 | - | 4.24 | 13,666 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,140 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,376 |
| American to British Word Translation | 0 | - | 4.14 | 139,481 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,000 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,527 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,408 |
| Champions League Winners | 0 | - | 4.92 | 1,012,164 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,533 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,466 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,863 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,972 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,206 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 263,238 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,455 |
| Russia Country Quiz | 0 | - | 4.83 | 114,994 |
| Countries That Border Russia | 0 | - | 4.98 | 463,668 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,577 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,482 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,852 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,431 |
| Departments of France | 0 | - | 4.93 | 54,748 |
| Countries Bordering France | 0 | - | 4.83 | 404,141 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,840 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,469 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,922 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,796 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,670 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,721 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,268 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,491 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,314 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,234 |
| England or Wales? | 0 | - | 4.94 | 45,866 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,457 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,266 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,413 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,693 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 116,098 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,522 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,923 |
| German History A-Z | 0 | - | 4.49 | 24,701 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,158 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,984 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,900 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,174 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,527 |
| Canary Islands | 0 | - | 4.62 | 17,505 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,928 |
| British Spellings | 0 | - | 4.06 | 99,539 |
| British Groups of Things | 0 | - | 4.25 | 82,957 |
| British Acronyms | 0 | - | 4.40 | 45,887 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,077 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,523 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,032 |
| Geography of Scotland | 0 | - | 4.63 | 21,698 |
| Medieval English History | 0 | - | 4.53 | 43,611 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,715,851 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,473 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,264 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,596 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,723 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,684 |
| Countries that Border Poland | 0 | - | 4.99 | 172,846 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,085 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,036 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,849 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,970 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,939 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,842 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,986 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,784 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,038 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,358 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,695 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,086 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,771 |
| Counties of Ireland | 0 | - | 4.92 | 196,625 |
| Italian Inventions | 0 | - | 3.81 | 18,464 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,124 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,842 |
| Ancient Roman Trivia #2 | 0 | - | 4.60 | 43,793 |
| Geography of the Roman Empire | 0 | - | 4.56 | 52,121 |
| Roman Names for Places | 0 | - | 4.62 | 58,568 |
| Byzantine History | 0 | - | 4.91 | 28,969 |
| Byzantine Emperors | 0 | - | 4.92 | 14,465 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,268 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,660 |
| British to American Word Translation | 0 | - | 3.74 | 255,245 |
| British Foods by Description | 0 | - | 3.94 | 48,356 |
| British and American Word Differences | 0 | - | 2.63 | 46,912 |
| English Inventions #1 | 0 | - | 3.15 | 23,583 |
| English Inventions #2 | 0 | - | 3.95 | 8,714 |
| British Geography Quiz #2 | 0 | - | 4.29 | 28,164 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,728 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,882 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,849 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,251 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,031 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,039 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,914 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,130 |
| Bridges of London | 0 | - | 4.17 | 10,131 |
