| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,935 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,279 |
| Geography of the French Empire | 0 | - | 4.45 | 27,044 |
| Counties of England | 0 | - | 4.97 | 795,840 |
| History of France | 0 | - | 4.59 | 56,921 |
| History of Italy | 0 | - | 4.55 | 31,959 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,641 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,200 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,831 |
| Europe Map Quiz | 0 | - | 5.00 | 4,759,210 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,069 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 80,368 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,503 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,862 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,757 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,689 |
| States of Germany | 0 | - | 4.96 | 152,258 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,967 |
| Regions of Italy | 0 | - | 4.92 | 75,752 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,043 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,805 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,119 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,933 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,684 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,454 |
| Regions of France | 0 | - | 4.75 | 120,605 |
| France Immigration by Country | 0 | - | 4.70 | 76,463 |
| Departments of France | 0 | - | 4.93 | 53,986 |
| Countries Bordering France | 0 | - | 4.83 | 402,248 |
| French History Multiple Choice | 0 | - | 4.55 | 33,017 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,881 |
| History of Austria | 0 | - | 4.70 | 17,851 |
| The Vikings! | 0 | - | 4.46 | 28,335 |
| The Portuguese Empire | 0 | - | 4.58 | 12,057 |
| Name the English Monarchs | 0 | - | 4.91 | 502,102 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,746 |
| French Inventions | 0 | - | 4.08 | 13,893 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,835 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,140 |
| History of Paris | 0 | - | 4.24 | 13,643 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,321 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,402 |
| Geography of the British Empire | 0 | - | 4.48 | 39,651 |
| Malta Country Quiz | 0 | - | 4.81 | 31,030 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,792 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,229 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,061 |
| The Only European Country ... | 0 | - | 4.91 | 216,327 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,962 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,787 |
| Name that Greek Letter | 0 | - | 4.93 | 323,282 |
| History of The Netherlands | 0 | - | 4.46 | 17,426 |
| History of Russia Quiz | 0 | - | 4.47 | 31,904 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,130 |
| The Trojan War | 0 | - | 4.83 | 39,683 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,704 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,480 |
| Roman Emperors | 0 | - | 4.95 | 119,829 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,196 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,242,149 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,327,320 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,560 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,099 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,444 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,064 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,245 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,136 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,160 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,935 |
| Slavic Countries | 0 | - | 4.96 | 111,576 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,469 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,325 |
| History of Germany | 0 | - | 4.39 | 52,798 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,766 |
| 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 | 20,141 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,302 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,952 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,347 |
| Ancient Greek Words | 0 | - | 4.93 | 111,478 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,300 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,249 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,162 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,610 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,754 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,391 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,129 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,646 |
| Monarchies of Europe | 0 | - | 4.90 | 98,046 |
| European Countries with One Border | 0 | - | 4.97 | 182,655 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,460 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,115 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,830 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,817 |
| France Country Quiz | 0 | - | 4.70 | 134,888 |
| Movies Set in France | 0 | - | 4.26 | 13,118 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,934 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,898 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,093 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,069 |
| American to British Word Translation | 0 | - | 4.14 | 138,907 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,878 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,361 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,306 |
| Champions League Winners | 0 | - | 4.92 | 1,005,578 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,748 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,030 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,902 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,961 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,584 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,920 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,532 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,535 |
| Russia Country Quiz | 0 | - | 4.85 | 114,385 |
| Countries That Border Russia | 0 | - | 4.98 | 461,446 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,293 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,321 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,658 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,613 |
| Kings of France Quiz | 0 | - | 4.20 | 32,704 |
| Germany Country Quiz | 0 | - | 4.82 | 157,732 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,007 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,054 |
| Italy Country Quiz | 0 | - | 4.82 | 123,309 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,235 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,919 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,534 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,738 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,806 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,532 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,436 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,177 |
| England or Wales? | 0 | - | 4.94 | 45,644 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,143 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,198 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,650 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,775 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,213 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,966 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,900 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,709 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,293 |
| Canary Islands | 0 | - | 4.62 | 17,471 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,656 |
| British Spellings | 0 | - | 4.06 | 99,429 |
| British Groups of Things | 0 | - | 4.25 | 82,855 |
| British Acronyms | 0 | - | 4.40 | 45,781 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,029 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,113 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,736 |
| Geography of Scotland | 0 | - | 4.63 | 21,608 |
| Medieval English History | 0 | - | 4.53 | 43,491 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,693,227 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,667 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,080 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,331 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,397 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,933 |
| Countries that Border Poland | 0 | - | 4.99 | 172,172 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,794 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,564 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,158 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,837 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,773 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,334 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,256 |
| 20 Questions About France | 0 | - | 4.11 | 32,402 |
| Countries that Beat France | 0 | - | 4.49 | 75,728 |
| France True or False? | 0 | - | 4.44 | 39,927 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,098 |
| Geography of Germany | 0 | - | 4.35 | 17,174 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,419 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,583 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,637 |
| Counties of Ireland | 0 | - | 4.92 | 195,002 |
| Italian Inventions | 0 | - | 3.81 | 18,437 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,817 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,904 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,720 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,883 |
| Roman Names for Places | 0 | - | 4.62 | 58,237 |
| Byzantine History | 0 | - | 4.91 | 28,795 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,144 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,831 |
| British to American Word Translation | 0 | - | 3.74 | 255,040 |
| British Foods by Description | 0 | - | 3.94 | 48,323 |
| 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 | 27,587 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,484 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,774 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,623 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,123 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,935 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,416 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,596 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,772 |
| Bridges of London | 0 | - | 4.17 | 10,098 |
