| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,721 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,098 |
| States of Germany | 0 | - | 4.96 | 150,967 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,311 |
| History of Germany | 0 | - | 4.39 | 52,707 |
| Germany Country Quiz | 0 | - | 4.82 | 157,103 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,609 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,311 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,797 |
| Counties of England | 0 | - | 4.97 | 792,107 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,257 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,066 |
| Geography of the British Empire | 0 | - | 4.48 | 39,569 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,474 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,803 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,906 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,446 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,322 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,686 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,859 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,831 |
| Regions of Italy | 0 | - | 4.92 | 75,123 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 44,069 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,093 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,675 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,289 |
| Medieval English History | 0 | - | 4.53 | 43,384 |
| Europe Map Quiz | 0 | - | 5.00 | 4,743,855 |
| French History Multiple Choice | 0 | - | 4.55 | 32,934 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,879 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,146 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,281 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,634 |
| Departments of France | 0 | - | 4.93 | 53,204 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,500 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,066 |
| Italy Country Quiz | 0 | - | 4.82 | 122,615 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,768 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,403 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,423 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,360 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,985 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,771 |
| Name the English Monarchs | 0 | - | 4.92 | 499,837 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,720 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,108 |
| England or Wales? | 0 | - | 4.94 | 45,473 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,380 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,421 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,265 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,172 |
| History of Scotland | 0 | - | 4.51 | 21,040 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,516 |
| Kings of France Quiz | 0 | - | 4.20 | 32,619 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,771 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,717 |
| German Inventions | 0 | - | 3.91 | 30,205 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,591 |
| The Trojan War | 0 | - | 4.83 | 39,545 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,255 |
| Name that Greek Letter | 0 | - | 4.93 | 322,429 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,093 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,250 |
| Roman Emperors | 0 | - | 4.95 | 119,142 |
| Malta Country Quiz | 0 | - | 4.81 | 30,918 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,802 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,102 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,213 |
| The Only European Country ... | 0 | - | 4.91 | 214,960 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,213 |
| History of Russia Quiz | 0 | - | 4.49 | 31,834 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,986 |
| History of Italy | 0 | - | 4.55 | 31,888 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,551 |
| History of The Netherlands | 0 | - | 4.46 | 17,352 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,080 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,697 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,127 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,031 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,890 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,762 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,233,633 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,043 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,084 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,658 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,253 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,731 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,113 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 169,290 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,667 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,495 |
| Slavic Countries | 0 | - | 4.96 | 111,190 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,404 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,102 |
| Ancient Greek Words | 0 | - | 4.93 | 111,052 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,658 |
| History of London | 0 | - | 4.33 | 26,123 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 352,257 |
| Regions of France | 0 | - | 4.78 | 119,866 |
| France Immigration by Country | 0 | - | 4.72 | 76,156 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,695 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,943 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,813 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,016 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,136 |
| UK Cities Map Quiz | 0 | - | 4.95 | 463,103 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,805 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,492 |
| Champions League Winners | 0 | - | 4.92 | 1,000,223 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,595 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,298 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,852 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,418 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,191 |
| Monarchies of Europe | 0 | - | 4.90 | 97,654 |
| European Countries with One Border | 0 | - | 4.97 | 182,060 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,923 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,638 |
| Federal Subjects of Russia | 0 | - | 4.94 | 145,098 |
| Countries That Border Russia | 0 | - | 4.98 | 460,175 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,489 |
| History of Austria | 0 | - | 4.70 | 17,793 |
| Austria Country Quiz | 0 | - | 4.57 | 59,509 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,442 |
| France Country Quiz | 0 | - | 4.70 | 134,427 |
| French Inventions | 0 | - | 4.08 | 13,874 |
| Geography of the French Empire | 0 | - | 4.45 | 26,988 |
| The French Revolution | 0 | - | 4.46 | 23,855 |
| Countries Bordering France | 0 | - | 4.83 | 400,958 |
| History of Paris | 0 | - | 4.24 | 13,628 |
| History of France | 0 | - | 4.59 | 56,550 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,561 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,080 |
| Greece Country Quiz | 0 | - | 4.74 | 65,946 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,065 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,594 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,342 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,188 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,950 |
| The Vikings! | 0 | - | 4.46 | 28,281 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,803 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,553 |
| The Portuguese Empire | 0 | - | 4.58 | 12,026 |
| Spain Country Quiz | 0 | - | 4.45 | 127,981 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,108 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,575 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,407 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,620 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,252 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,609 |
| Counties of Wales | 0 | - | 4.63 | 39,049 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,263 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,568 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,442 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,613 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,630 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,975 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,412 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,804 |
| Russia Country Quiz | 0 | - | 4.85 | 113,995 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,056 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,170 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,711 |
| German History A-Z | 0 | - | 4.49 | 24,500 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,740 |
| History of Ireland | 0 | - | 4.39 | 30,985 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,122 |
| Byzantine History | 0 | - | 4.91 | 28,689 |
| Canary Islands | 0 | - | 4.61 | 17,432 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,377 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,338 |
| British Spellings | 0 | - | 4.07 | 99,342 |
| British Groups of Things | 0 | - | 4.25 | 82,758 |
| British Acronyms | 0 | - | 4.39 | 45,693 |
| UK Immigration by Country | 0 | - | 4.94 | 140,048 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,989 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,828 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,759 |
| Geography of Scotland | 0 | - | 4.63 | 21,534 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 129,150 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,947 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,686 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,915 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,623 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,062 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,761 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,086 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,415 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,961 |
| Countries that Border Poland | 0 | - | 4.99 | 171,732 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,541 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,209 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,411 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,907 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,714 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,643 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,034 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,617 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,001 |
| 20 Questions About France | 0 | - | 4.11 | 32,359 |
