| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,974 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,358 |
| The French Revolution | 0 | - | 4.46 | 23,926 |
| Counties of England | 0 | - | 4.97 | 796,236 |
| History of France | 0 | - | 4.59 | 56,940 |
| History of Italy | 0 | - | 4.55 | 31,968 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,648 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,215 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,846 |
| Europe Map Quiz | 0 | - | 5.00 | 4,760,988 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,139 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,183 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,573 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,923 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,802 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,751 |
| States of Germany | 0 | - | 4.96 | 152,401 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,992 |
| Regions of Italy | 0 | - | 4.92 | 75,822 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,100 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,883 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,171 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,961 |
| 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 | 120,705 |
| France Immigration by Country | 0 | - | 4.70 | 76,482 |
| Departments of France | 0 | - | 4.93 | 54,043 |
| Countries Bordering France | 0 | - | 4.83 | 402,407 |
| French History Multiple Choice | 0 | - | 4.55 | 33,028 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,015 |
| 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 | 502,355 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,759 |
| 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 | 72,157 |
| 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 | 122,429 |
| Geography of the British Empire | 0 | - | 4.48 | 39,662 |
| Malta Country Quiz | 0 | - | 4.81 | 31,041 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,907 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,330 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,140 |
| The Only European Country ... | 0 | - | 4.91 | 216,465 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,034 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,052 |
| Name that Greek Letter | 0 | - | 4.93 | 323,351 |
| 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 | 47,160 |
| The Trojan War | 0 | - | 4.83 | 39,706 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,765 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,503 |
| Roman Emperors | 0 | - | 4.95 | 119,959 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,204 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,243,114 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,328,084 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,617 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,152 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,564 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,105 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,342 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,494 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,210 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,141 |
| Slavic Countries | 0 | - | 4.96 | 111,610 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,472 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,335 |
| History of Germany | 0 | - | 4.39 | 52,806 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,858 |
| 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 | 355,620 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,982 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,555 |
| Ancient Greek Words | 0 | - | 4.93 | 111,541 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,316 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,257 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,197 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,618 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,799 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,450 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,208 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,696 |
| Monarchies of Europe | 0 | - | 4.90 | 98,094 |
| European Countries with One Border | 0 | - | 4.97 | 182,713 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,513 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 78,322 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,001 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,855 |
| France Country Quiz | 0 | - | 4.70 | 134,930 |
| 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 | 74,079 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,100 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,107 |
| American to British Word Translation | 0 | - | 4.14 | 138,981 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,886 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,541 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,313 |
| Champions League Winners | 0 | - | 4.92 | 1,006,093 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,802 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,065 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,945 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,097 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,692 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,011 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,755 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,623 |
| Russia Country Quiz | 0 | - | 4.85 | 114,432 |
| Countries That Border Russia | 0 | - | 4.98 | 461,583 |
| 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 | 166,685 |
| Kings of France Quiz | 0 | - | 4.20 | 32,728 |
| Germany Country Quiz | 0 | - | 4.82 | 157,783 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,216 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,272 |
| Italy Country Quiz | 0 | - | 4.82 | 123,358 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,307 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,981 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,538 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,907 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,890 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,599 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,517 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,180 |
| England or Wales? | 0 | - | 4.94 | 45,667 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,248 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,316 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,654 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,859 |
| 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 | 31,906 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,827 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,309 |
| Canary Islands | 0 | - | 4.62 | 17,475 |
| Switzerland Immigration by Country | 0 | - | 4.68 | 29,683 |
| British Spellings | 0 | - | 4.06 | 99,441 |
| British Groups of Things | 0 | - | 4.25 | 82,861 |
| British Acronyms | 0 | - | 4.40 | 45,787 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,033 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,154 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,757 |
| Geography of Scotland | 0 | - | 4.63 | 21,612 |
| Medieval English History | 0 | - | 4.53 | 43,498 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,695,831 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,724 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,092 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,357 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,417 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,993 |
| Countries that Border Poland | 0 | - | 4.99 | 172,229 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,822 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,687 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,190 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,858 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,788 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,361 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,286 |
| 20 Questions About France | 0 | - | 4.11 | 32,406 |
| Countries that Beat France | 0 | - | 4.49 | 75,782 |
| 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 | 96,535 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,620 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,646 |
| Counties of Ireland | 0 | - | 4.92 | 195,119 |
| Italian Inventions | 0 | - | 3.81 | 18,437 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,842 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,967 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,729 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,909 |
| Roman Names for Places | 0 | - | 4.62 | 58,262 |
| Byzantine History | 0 | - | 4.91 | 28,841 |
| Byzantine Emperors | 0 | - | 4.94 | 13,844 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,151 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,885 |
| 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 | 8,698 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,588 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,592 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,782 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,644 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,133 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,950 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,643 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,617 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,803 |
