| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,200 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,228 |
| States of Germany | 0 | - | 4.95 | 153,228 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,290 |
| Counties of England | 0 | - | 4.97 | 798,969 |
| History of Italy | 0 | - | 4.55 | 32,054 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,721 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,298 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,958 |
| Europe Map Quiz | 0 | - | 5.00 | 4,771,547 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,765 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,466 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,116 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,330 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,148 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,861 |
| Regions of Italy | 0 | - | 4.92 | 76,248 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,431 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,421 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,419 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,163 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,756 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,590 |
| Germany Country Quiz | 0 | - | 4.83 | 158,191 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,702 |
| History of Germany | 0 | - | 4.39 | 52,899 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,081 |
| History of Austria | 0 | - | 4.70 | 17,905 |
| Geography of the French Empire | 0 | - | 4.45 | 27,156 |
| The French Revolution | 0 | - | 4.47 | 24,064 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,615 |
| The Vikings! | 0 | - | 4.46 | 28,368 |
| The Portuguese Empire | 0 | - | 4.58 | 12,083 |
| Name the English Monarchs | 0 | - | 4.91 | 504,000 |
| History of France | 0 | - | 4.59 | 57,278 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,383 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,514 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,406 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,675 |
| Geography of the British Empire | 0 | - | 4.48 | 39,735 |
| Malta Country Quiz | 0 | - | 4.81 | 31,117 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,594 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,060 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,703 |
| The Only European Country ... | 0 | - | 4.91 | 217,418 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,590 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,932 |
| Name that Greek Letter | 0 | - | 4.93 | 324,182 |
| History of The Netherlands | 0 | - | 4.46 | 17,484 |
| History of Russia Quiz | 0 | - | 4.47 | 31,952 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,746 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,206 |
| The Trojan War | 0 | - | 4.83 | 39,799 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,259 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,655 |
| Roman Emperors | 0 | - | 4.95 | 120,406 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,270 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,248,754 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,817 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,937 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,443 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,396 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,364 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,279 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 173,087 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,566 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,408 |
| Slavic Countries | 0 | - | 4.96 | 111,889 |
| French History Multiple Choice | 0 | - | 4.55 | 33,128 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,481 |
| Geography of Germany | 0 | - | 4.35 | 17,207 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,518 |
| History of Spain | 0 | - | 4.23 | 21,116 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,782 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,187 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 358,230 |
| Regions of France | 0 | - | 4.72 | 121,259 |
| France Immigration by Country | 0 | - | 4.70 | 76,684 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,142 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,933 |
| Ancient Greek Words | 0 | - | 4.93 | 111,917 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,501 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,340 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,445 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,694 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 97,938 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,053 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,861 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,726 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,997 |
| Monarchies of Europe | 0 | - | 4.90 | 98,355 |
| European Countries with One Border | 0 | - | 4.97 | 183,131 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,904 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 86,796 |
| Federal Subjects of Russia | 0 | - | 4.95 | 148,027 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,103 |
| French Inventions | 0 | - | 4.10 | 13,909 |
| History of Paris | 0 | - | 4.24 | 13,660 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,127 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,281 |
| American to British Word Translation | 0 | - | 4.14 | 139,320 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,949 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,171 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,374 |
| Champions League Winners | 0 | - | 4.92 | 1,009,974 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,365 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,269 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,939 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,390 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,643 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,105 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,050 |
| Russia Country Quiz | 0 | - | 4.83 | 114,706 |
| Countries That Border Russia | 0 | - | 4.98 | 462,852 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,472 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,415 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,779 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,173 |
| Departments of France | 0 | - | 4.93 | 54,474 |
| Countries Bordering France | 0 | - | 4.83 | 403,578 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,633 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,386 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,668 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,611 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,618 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,049 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,121 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,231 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,991 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,213 |
| England or Wales? | 0 | - | 4.94 | 45,804 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,009 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,097 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,612 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,675 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,627 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,420 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,868 |
| German History A-Z | 0 | - | 4.49 | 24,665 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,079 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,947 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,840 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,742 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,420 |
| Canary Islands | 0 | - | 4.62 | 17,492 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,834 |
| British Spellings | 0 | - | 4.06 | 99,509 |
| British Groups of Things | 0 | - | 4.25 | 82,912 |
| British Acronyms | 0 | - | 4.40 | 45,852 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,056 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,392 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,941 |
| Geography of Scotland | 0 | - | 4.63 | 21,659 |
| Medieval English History | 0 | - | 4.53 | 43,573 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,708,776 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,094 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,191 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,522 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,646 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,378 |
| Countries that Border Poland | 0 | - | 4.99 | 172,616 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,988 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,518 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,431 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,928 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,884 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,673 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,857 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,667 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,969 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,286 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,638 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,904 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,712 |
| Counties of Ireland | 0 | - | 4.92 | 196,073 |
| Italian Inventions | 0 | - | 3.81 | 18,460 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,025 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,360 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,792 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,993 |
| Roman Names for Places | 0 | - | 4.62 | 58,403 |
| Byzantine History | 0 | - | 4.91 | 28,919 |
| Byzantine Emperors | 0 | - | 4.92 | 14,368 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,219 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,374 |
| British to American Word Translation | 0 | - | 3.74 | 255,172 |
| British Foods by Description | 0 | - | 3.94 | 48,342 |
| British and American Word Differences | 0 | - | 2.63 | 46,898 |
| English Inventions #1 | 0 | - | 3.15 | 23,573 |
| English Inventions #2 | 0 | - | 3.95 | 8,708 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,621 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,287 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,847 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,779 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,208 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,002 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,095 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,805 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,010 |
| Bridges of London | 0 | - | 4.17 | 10,119 |
