| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,178 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,126 |
| States of Germany | 0 | - | 4.95 | 153,116 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,262 |
| History of Germany | 0 | - | 4.39 | 52,891 |
| Germany Country Quiz | 0 | - | 4.83 | 158,144 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,282 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 42,044 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,483 |
| Counties of England | 0 | - | 4.97 | 798,632 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,401 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,644 |
| Geography of the British Empire | 0 | - | 4.48 | 39,733 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,705 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,246 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,055 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,294 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,115 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,771 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,069 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,945 |
| Regions of Italy | 0 | - | 4.92 | 76,205 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,401 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,339 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,386 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,135 |
| Medieval English History | 0 | - | 4.53 | 43,566 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,978 |
| French History Multiple Choice | 0 | - | 4.55 | 33,116 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,589 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,266 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,567 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,759 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,096 |
| Departments of France | 0 | - | 4.93 | 54,418 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,592 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,565 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,628 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,300 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,610 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,094 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,165 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,953 |
| Name the English Monarchs | 0 | - | 4.91 | 503,803 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,776 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,182 |
| England or Wales? | 0 | - | 4.94 | 45,788 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,941 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,290 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,298 |
| History of Scotland | 0 | - | 4.51 | 21,123 |
| Kings of France Quiz | 0 | - | 4.20 | 32,810 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,710 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,178 |
| German Inventions | 0 | - | 3.91 | 30,250 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,648 |
| The Trojan War | 0 | - | 4.83 | 39,794 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,713 |
| Name that Greek Letter | 0 | - | 4.93 | 324,128 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,210 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,640 |
| Roman Emperors | 0 | - | 4.95 | 120,365 |
| Malta Country Quiz | 0 | - | 4.81 | 31,109 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,047 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,508 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,981 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,637 |
| The Only European Country ... | 0 | - | 4.91 | 217,325 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,531 |
| History of Russia Quiz | 0 | - | 4.47 | 31,947 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,467 |
| History of Italy | 0 | - | 4.55 | 32,048 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,716 |
| History of The Netherlands | 0 | - | 4.46 | 17,479 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,294 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,949 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,210 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,200 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,998 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,549 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,248,058 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,496 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,896 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,408 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,310 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,339 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,149 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,830 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,536 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,378 |
| Slavic Countries | 0 | - | 4.96 | 111,869 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,504 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,634 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,767 |
| Ancient Greek Words | 0 | - | 4.93 | 111,883 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,735 |
| History of London | 0 | - | 4.33 | 26,217 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 357,978 |
| Regions of France | 0 | - | 4.72 | 121,181 |
| France Immigration by Country | 0 | - | 4.70 | 76,667 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,133 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,882 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,267 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,480 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,336 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,081 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,421 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,686 |
| Champions League Winners | 0 | - | 4.92 | 1,009,556 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,028 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,818 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,661 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,966 |
| Monarchies of Europe | 0 | - | 4.90 | 98,328 |
| European Countries with One Border | 0 | - | 4.97 | 183,093 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,870 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 85,430 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,945 |
| Countries That Border Russia | 0 | - | 4.98 | 462,751 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,076 |
| History of Austria | 0 | - | 4.70 | 17,900 |
| Austria Country Quiz | 0 | - | 4.57 | 59,828 |
| Belgium Country Quiz | 0 | - | 4.72 | 71,919 |
| France Country Quiz | 0 | - | 4.70 | 135,160 |
| French Inventions | 0 | - | 4.10 | 13,907 |
| Geography of the French Empire | 0 | - | 4.45 | 27,152 |
| The French Revolution | 0 | - | 4.47 | 24,055 |
| Countries Bordering France | 0 | - | 4.83 | 403,471 |
| History of Paris | 0 | - | 4.24 | 13,657 |
| History of France | 0 | - | 4.59 | 57,252 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,912 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,373 |
| Greece Country Quiz | 0 | - | 4.74 | 66,357 |
| Italy Country Quiz | 0 | - | 4.77 | 123,577 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,123 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,816 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,560 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,635 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,537 |
| The Vikings! | 0 | - | 4.46 | 28,368 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,205 |
| Portugal Country Quiz | 0 | - | 4.69 | 72,008 |
| The Portuguese Empire | 0 | - | 4.58 | 12,081 |
| Spain Country Quiz | 0 | - | 4.44 | 128,757 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,447 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,109 |
| United Kingdom A-Z | 0 | - | 4.52 | 88,146 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,765 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,367 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,742 |
| Counties of Wales | 0 | - | 4.63 | 39,373 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,065 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,299 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,225 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,845 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,325 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,575 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,912 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,002 |
| Russia Country Quiz | 0 | - | 4.83 | 114,679 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,456 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,409 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,853 |
| German History A-Z | 0 | - | 4.49 | 24,654 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,837 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,658 |
| History of Ireland | 0 | - | 4.39 | 31,269 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,404 |
| Byzantine History | 0 | - | 4.91 | 28,913 |
| Byzantine Emperors | 0 | - | 4.92 | 14,351 |
| Canary Islands | 0 | - | 4.62 | 17,490 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,235 |
| Switzerland Immigration by Country | 0 | - | 4.68 | 29,813 |
| British Spellings | 0 | - | 4.06 | 99,501 |
| British Groups of Things | 0 | - | 4.25 | 82,904 |
| British Acronyms | 0 | - | 4.40 | 45,844 |
| UK Immigration by Country | 0 | - | 4.94 | 141,138 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,053 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,135 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,370 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,929 |
| Geography of Scotland | 0 | - | 4.63 | 21,653 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,947 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,707,232 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,046 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,176 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,673 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,501 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,539 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,613 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,336 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,396 |
| Countries that Border Poland | 0 | - | 4.99 | 172,576 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,966 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,040 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,430 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,402 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,921 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,878 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,643 |
