| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,930 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,276 |
| Geography of the French Empire | 0 | - | 4.45 | 27,042 |
| Counties of England | 0 | - | 4.97 | 795,772 |
| History of France | 0 | - | 4.59 | 56,917 |
| History of Italy | 0 | - | 4.55 | 31,959 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,638 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,199 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,831 |
| Europe Map Quiz | 0 | - | 5.00 | 4,758,930 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,050 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 80,188 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,484 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,848 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,743 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,681 |
| States of Germany | 0 | - | 4.96 | 152,215 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,958 |
| Regions of Italy | 0 | - | 4.92 | 75,730 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,037 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,787 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,112 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,928 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,683 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,449 |
| Regions of France | 0 | - | 4.75 | 120,587 |
| France Immigration by Country | 0 | - | 4.70 | 76,458 |
| Departments of France | 0 | - | 4.93 | 53,974 |
| Countries Bordering France | 0 | - | 4.83 | 402,207 |
| French History Multiple Choice | 0 | - | 4.55 | 33,016 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,855 |
| History of Austria | 0 | - | 4.70 | 17,850 |
| The Vikings! | 0 | - | 4.46 | 28,334 |
| The Portuguese Empire | 0 | - | 4.58 | 12,057 |
| Name the English Monarchs | 0 | - | 4.91 | 502,056 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,746 |
| French Inventions | 0 | - | 4.08 | 13,892 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,833 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,135 |
| History of Paris | 0 | - | 4.24 | 13,643 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,320 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,393 |
| Geography of the British Empire | 0 | - | 4.48 | 39,646 |
| Malta Country Quiz | 0 | - | 4.81 | 31,027 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,766 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,214 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,038 |
| The Only European Country ... | 0 | - | 4.91 | 216,301 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,948 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,739 |
| Name that Greek Letter | 0 | - | 4.93 | 323,268 |
| History of The Netherlands | 0 | - | 4.46 | 17,425 |
| History of Russia Quiz | 0 | - | 4.47 | 31,902 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,123 |
| The Trojan War | 0 | - | 4.83 | 39,680 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,682 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,477 |
| Roman Emperors | 0 | - | 4.95 | 119,809 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,195 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,241,994 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,327,250 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,554 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,087 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,421 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,060 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,228 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,076 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,146 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,926 |
| Slavic Countries | 0 | - | 4.96 | 111,567 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,469 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,324 |
| History of Germany | 0 | - | 4.39 | 52,796 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,743 |
| History of Spain | 0 | - | 4.23 | 21,075 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,744 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,140 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,251 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,947 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,301 |
| Ancient Greek Words | 0 | - | 4.93 | 111,468 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,299 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,247 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,155 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,604 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,750 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,383 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,115 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,635 |
| Monarchies of Europe | 0 | - | 4.90 | 98,036 |
| European Countries with One Border | 0 | - | 4.97 | 182,638 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,447 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,107 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,811 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,810 |
| France Country Quiz | 0 | - | 4.70 | 134,882 |
| Movies Set in France | 0 | - | 4.26 | 13,118 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,930 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,891 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,093 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,064 |
| American to British Word Translation | 0 | - | 4.14 | 138,901 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,877 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,349 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,305 |
| Champions League Winners | 0 | - | 4.92 | 1,005,474 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,735 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,027 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,894 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,943 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,565 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,905 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,490 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,526 |
| Russia Country Quiz | 0 | - | 4.85 | 114,374 |
| Countries That Border Russia | 0 | - | 4.98 | 461,407 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,290 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,318 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,656 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,599 |
| Kings of France Quiz | 0 | - | 4.20 | 32,702 |
| Germany Country Quiz | 0 | - | 4.82 | 157,721 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,002 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,977 |
| Italy Country Quiz | 0 | - | 4.82 | 123,297 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,228 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,910 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,532 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,708 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,799 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,521 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,416 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,175 |
| England or Wales? | 0 | - | 4.94 | 45,642 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,130 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,182 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,650 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,756 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,209 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,965 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,894 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,676 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,286 |
| Canary Islands | 0 | - | 4.62 | 17,471 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,654 |
| British Spellings | 0 | - | 4.06 | 99,429 |
| British Groups of Things | 0 | - | 4.25 | 82,853 |
| British Acronyms | 0 | - | 4.40 | 45,780 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,028 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,108 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,732 |
| Geography of Scotland | 0 | - | 4.63 | 21,606 |
| Medieval English History | 0 | - | 4.53 | 43,489 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,692,704 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,655 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,078 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,329 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,394 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,928 |
| Countries that Border Poland | 0 | - | 4.99 | 172,163 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,787 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,539 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,153 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,835 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,770 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,328 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,247 |
| 20 Questions About France | 0 | - | 4.11 | 32,402 |
| Countries that Beat France | 0 | - | 4.49 | 75,714 |
| France True or False? | 0 | - | 4.44 | 39,927 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,097 |
| Geography of Germany | 0 | - | 4.35 | 17,173 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,399 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,570 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,635 |
| Counties of Ireland | 0 | - | 4.92 | 194,971 |
| Italian Inventions | 0 | - | 3.81 | 18,436 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,811 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,890 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,718 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,879 |
| Roman Names for Places | 0 | - | 4.62 | 58,232 |
| Byzantine History | 0 | - | 4.91 | 28,787 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,141 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,814 |
| British to American Word Translation | 0 | - | 3.74 | 255,037 |
| British Foods by Description | 0 | - | 3.94 | 48,322 |
| British and American Word Differences | 0 | - | 2.63 | 46,869 |
| English Inventions #1 | 0 | - | 3.15 | 23,561 |
| English Inventions #2 | 0 | - | 4.00 | 8,697 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,586 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,455 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,771 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,621 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,121 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,931 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,371 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,593 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,770 |
| Bridges of London | 0 | - | 4.17 | 10,098 |
