| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,037 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,487 |
| Geography of the French Empire | 0 | - | 4.45 | 27,072 |
| The French Revolution | 0 | - | 4.47 | 23,956 |
| Counties of England | 0 | - | 4.97 | 797,294 |
| History of France | 0 | - | 4.59 | 57,022 |
| History of Italy | 0 | - | 4.55 | 31,981 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,671 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,243 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,876 |
| Europe Map Quiz | 0 | - | 5.00 | 4,764,407 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,440 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 82,214 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,743 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,065 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,942 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,890 |
| States of Germany | 0 | - | 4.95 | 152,713 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,087 |
| Regions of Italy | 0 | - | 4.92 | 75,951 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,221 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,038 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,245 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,028 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,711 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,508 |
| Regions of France | 0 | - | 4.72 | 120,887 |
| France Immigration by Country | 0 | - | 4.70 | 76,548 |
| Departments of France | 0 | - | 4.93 | 54,188 |
| Countries Bordering France | 0 | - | 4.83 | 402,666 |
| French History Multiple Choice | 0 | - | 4.55 | 33,049 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,332 |
| History of Austria | 0 | - | 4.70 | 17,866 |
| The Vikings! | 0 | - | 4.46 | 28,349 |
| The Portuguese Empire | 0 | - | 4.58 | 12,067 |
| Name the English Monarchs | 0 | - | 4.91 | 502,944 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,782 |
| French Inventions | 0 | - | 4.08 | 13,899 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,885 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,200 |
| History of Paris | 0 | - | 4.24 | 13,653 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,357 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,514 |
| Geography of the British Empire | 0 | - | 4.48 | 39,689 |
| Malta Country Quiz | 0 | - | 4.81 | 31,070 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,133 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,580 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,338 |
| The Only European Country ... | 0 | - | 4.91 | 216,782 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,218 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,729 |
| Name that Greek Letter | 0 | - | 4.93 | 323,579 |
| History of The Netherlands | 0 | - | 4.46 | 17,439 |
| History of Russia Quiz | 0 | - | 4.47 | 31,923 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,245 |
| The Trojan War | 0 | - | 4.83 | 39,741 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,913 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,555 |
| Roman Emperors | 0 | - | 4.95 | 120,115 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,226 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,244,889 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,329,108 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,714 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,245 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,833 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,192 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,699 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,050 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,344 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,244 |
| Slavic Countries | 0 | - | 4.96 | 111,711 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,488 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,371 |
| History of Germany | 0 | - | 4.39 | 52,834 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,084 |
| History of Spain | 0 | - | 4.23 | 21,093 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,754 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,158 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 356,292 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,049 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,036 |
| Ancient Greek Words | 0 | - | 4.93 | 111,656 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,395 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,281 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,282 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,641 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,892 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,602 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,400 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,797 |
| Monarchies of Europe | 0 | - | 4.90 | 98,182 |
| European Countries with One Border | 0 | - | 4.97 | 182,839 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,644 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,669 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,449 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,939 |
| France Country Quiz | 0 | - | 4.70 | 135,021 |
| Movies Set in France | 0 | - | 4.26 | 13,121 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,962 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,107 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,165 |
| American to British Word Translation | 0 | - | 4.14 | 139,112 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,907 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,738 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,336 |
| Champions League Winners | 0 | - | 4.92 | 1,007,244 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,899 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,163 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,065 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,396 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,952 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,208 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,210 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,768 |
| Russia Country Quiz | 0 | - | 4.83 | 114,527 |
| Countries That Border Russia | 0 | - | 4.98 | 461,867 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,367 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,355 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,703 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,819 |
| Kings of France Quiz | 0 | - | 4.20 | 32,756 |
| Germany Country Quiz | 0 | - | 4.83 | 157,918 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,393 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,524 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,446 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,095 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,559 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,296 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,961 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,715 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,684 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,193 |
| England or Wales? | 0 | - | 4.94 | 45,716 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,456 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,698 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,660 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,055 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,301 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,012 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,920 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,067 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,344 |
| Canary Islands | 0 | - | 4.62 | 17,483 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,727 |
| British Spellings | 0 | - | 4.06 | 99,463 |
| British Groups of Things | 0 | - | 4.25 | 82,879 |
| British Acronyms | 0 | - | 4.40 | 45,805 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,039 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,233 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,837 |
| Geography of Scotland | 0 | - | 4.63 | 21,624 |
| Medieval English History | 0 | - | 4.53 | 43,524 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,700,247 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,829 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,124 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,411 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,477 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,112 |
| Countries that Border Poland | 0 | - | 4.99 | 172,317 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,871 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,999 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,256 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,883 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,823 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,431 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,345 |
| 20 Questions About France | 0 | - | 4.11 | 32,414 |
| Countries that Beat France | 0 | - | 4.49 | 75,886 |
| France True or False? | 0 | - | 4.44 | 39,945 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,115 |
| Geography of Germany | 0 | - | 4.35 | 17,190 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,832 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,709 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,672 |
| Counties of Ireland | 0 | - | 4.92 | 195,454 |
| Italian Inventions | 0 | - | 3.81 | 18,444 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,883 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,099 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,759 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,946 |
| Roman Names for Places | 0 | - | 4.62 | 58,310 |
| Byzantine History | 0 | - | 4.91 | 28,875 |
| Byzantine Emperors | 0 | - | 4.92 | 14,204 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,177 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,047 |
| British to American Word Translation | 0 | - | 3.74 | 255,099 |
| British Foods by Description | 0 | - | 3.94 | 48,331 |
| British and American Word Differences | 0 | - | 2.63 | 46,884 |
| English Inventions #1 | 0 | - | 3.15 | 23,567 |
| English Inventions #2 | 0 | - | 3.95 | 8,703 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,597 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,881 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,802 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,686 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,163 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,969 |
| Prime Ministers of the UK | 0 | - | 4.95 | 439,232 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,688 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,873 |
| Bridges of London | 0 | - | 4.17 | 10,108 |
