| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,631 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,955 |
| States of Germany | 0 | - | 4.96 | 150,551 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,175 |
| History of Germany | 0 | - | 4.39 | 52,667 |
| Germany Country Quiz | 0 | - | 4.82 | 156,830 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,499 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,231 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,653 |
| Counties of England | 0 | - | 4.97 | 790,613 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,229 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,962 |
| Geography of the British Empire | 0 | - | 4.48 | 39,530 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,195 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,639 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,660 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,307 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,196 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,464 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,821 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,803 |
| Regions of Italy | 0 | - | 4.92 | 74,938 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,965 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,628 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,495 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,170 |
| Medieval English History | 0 | - | 4.53 | 43,350 |
| Europe Map Quiz | 0 | - | 5.00 | 4,737,858 |
| French History Multiple Choice | 0 | - | 4.55 | 32,906 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,505 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,117 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,220 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,426 |
| Departments of France | 0 | - | 4.93 | 53,031 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,363 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,838 |
| Italy Country Quiz | 0 | - | 4.82 | 122,435 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,596 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,284 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,403 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,226 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,836 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,561 |
| Name the English Monarchs | 0 | - | 4.92 | 498,948 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,703 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,090 |
| England or Wales? | 0 | - | 4.94 | 45,404 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,811 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,404 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,826 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,145 |
| History of Scotland | 0 | - | 4.51 | 21,023 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,462 |
| Kings of France Quiz | 0 | - | 4.20 | 32,590 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,587 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,589 |
| German Inventions | 0 | - | 3.91 | 30,194 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,585 |
| The Trojan War | 0 | - | 4.83 | 39,487 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,186 |
| Name that Greek Letter | 0 | - | 4.94 | 322,040 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,843 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,151 |
| Roman Emperors | 0 | - | 4.95 | 118,763 |
| Malta Country Quiz | 0 | - | 4.81 | 30,877 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,435 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,732 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,924 |
| The Only European Country ... | 0 | - | 4.91 | 214,433 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,915 |
| History of Russia Quiz | 0 | - | 4.49 | 31,813 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,659 |
| History of Italy | 0 | - | 4.55 | 31,860 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,518 |
| History of The Netherlands | 0 | - | 4.46 | 17,341 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,024 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,631 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,112 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,994 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,863 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,615 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,230,238 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,321,515 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,910 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,487 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,822 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,620 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 308,353 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 168,693 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,468 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,355 |
| Slavic Countries | 0 | - | 4.96 | 111,028 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,360 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,314 |
| Ancient Greek Words | 0 | - | 4.92 | 110,894 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,642 |
| History of London | 0 | - | 4.33 | 26,113 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 351,088 |
| Regions of France | 0 | - | 4.78 | 119,568 |
| France Immigration by Country | 0 | - | 4.72 | 76,055 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,593 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,352 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,713 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,929 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,099 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,717 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,123 |
| The UK for Americans - True or False | 0 | - | 4.44 | 58,447 |
| Champions League Winners | 0 | - | 4.92 | 998,240 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,503 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,175 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,614 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,144 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,989 |
| Monarchies of Europe | 0 | - | 4.90 | 97,492 |
| European Countries with One Border | 0 | - | 4.97 | 181,843 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,741 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,499 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,593 |
| Countries That Border Russia | 0 | - | 4.98 | 459,692 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,335 |
| History of Austria | 0 | - | 4.70 | 17,777 |
| Austria Country Quiz | 0 | - | 4.57 | 59,437 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,357 |
| France Country Quiz | 0 | - | 4.70 | 134,026 |
| French Inventions | 0 | - | 4.08 | 13,868 |
| Geography of the French Empire | 0 | - | 4.45 | 26,963 |
| The French Revolution | 0 | - | 4.46 | 23,826 |
| Countries Bordering France | 0 | - | 4.83 | 400,422 |
| History of Paris | 0 | - | 4.24 | 13,623 |
| History of France | 0 | - | 4.59 | 56,341 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,464 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,010 |
| Greece Country Quiz | 0 | - | 4.74 | 65,859 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,054 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,542 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,297 |
| Netherlands Country Quiz | 0 | - | 4.50 | 80,085 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,840 |
| The Vikings! | 0 | - | 4.46 | 28,263 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,756 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,473 |
| The Portuguese Empire | 0 | - | 4.54 | 12,006 |
| Spain Country Quiz | 0 | - | 4.45 | 127,803 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,032 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,364 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,334 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,595 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,231 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,578 |
| Counties of Wales | 0 | - | 4.63 | 39,004 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,091 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,401 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,275 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,008 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,630 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,540 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,589 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,504 |
| Russia Country Quiz | 0 | - | 4.85 | 113,817 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,971 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,113 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,683 |
| German History A-Z | 0 | - | 4.49 | 24,467 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,384 |
| History of Ireland | 0 | - | 4.39 | 30,911 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,052 |
| Byzantine History | 0 | - | 4.91 | 28,661 |
| Canary Islands | 0 | - | 4.61 | 17,420 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,178 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,258 |
| British Spellings | 0 | - | 4.07 | 99,300 |
| British Groups of Things | 0 | - | 4.25 | 82,727 |
| British Acronyms | 0 | - | 4.39 | 45,664 |
| UK Immigration by Country | 0 | - | 4.94 | 139,900 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,974 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,512 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,638 |
| Geography of Scotland | 0 | - | 4.63 | 21,510 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,807 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,663,605 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,496 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,847 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,613 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 137,954 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,418 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,967 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,172 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,866 |
| Countries that Border Poland | 0 | - | 4.99 | 171,564 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,464 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,061 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,982 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,808 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,673 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,599 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,894 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,566 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,905 |
| 20 Questions About France | 0 | - | 4.11 | 32,351 |
