| States of Germany Map Quiz | 0 | - | 4.91 | 131,698 |
| States of Germany | 0 | - | 4.96 | 150,091 |
| Germany Immigration by Country | 0 | - | 4.84 | 80,025 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,527 |
| History of Germany | 0 | - | 4.39 | 52,615 |
| Germany Country Quiz | 0 | - | 4.82 | 156,567 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,377 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,144 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,506 |
| Counties of England | 0 | - | 4.97 | 789,281 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,180 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,789 |
| Geography of the British Empire | 0 | - | 4.48 | 39,476 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,961 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,437 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,425 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,123 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,024 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,156 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,780 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,772 |
| Regions of Italy | 0 | - | 4.92 | 74,734 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,824 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,364 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,201 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,935 |
| Medieval English History | 0 | - | 4.53 | 43,323 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,712 |
| French History Multiple Choice | 0 | - | 4.55 | 32,879 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,078 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,092 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,150 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,211 |
| Departments of France | 0 | - | 4.93 | 52,841 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,160 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,485 |
| Italy Country Quiz | 0 | - | 4.82 | 122,223 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,396 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,089 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,371 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,957 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,650 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,303 |
| Name the English Monarchs | 0 | - | 4.92 | 497,965 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,690 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,075 |
| England or Wales? | 0 | - | 4.94 | 45,321 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,231 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,384 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,358 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,123 |
| History of Scotland | 0 | - | 4.51 | 21,004 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,402 |
| Kings of France Quiz | 0 | - | 4.20 | 32,558 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,387 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,465 |
| German Inventions | 0 | - | 3.91 | 30,182 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,572 |
| The Trojan War | 0 | - | 4.83 | 39,434 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,992 |
| Name that Greek Letter | 0 | - | 4.94 | 321,699 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,545 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,056 |
| Roman Emperors | 0 | - | 4.95 | 118,497 |
| Malta Country Quiz | 0 | - | 4.81 | 30,829 |
| Countries That Use the Euro | 0 | - | 4.96 | 103,020 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,327 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,581 |
| The Only European Country ... | 0 | - | 4.91 | 213,875 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,560 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,312 |
| History of Italy | 0 | - | 4.55 | 31,817 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,483 |
| History of The Netherlands | 0 | - | 4.46 | 17,311 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,983 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,409 |
| Former Dominions of the British Empire | 0 | - | 4.30 | 24,086 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,960 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,837 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,226,882 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,319,899 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,723 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,297 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,363 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,479 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,866 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,938 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,275 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,207 |
| Slavic Countries | 0 | - | 4.96 | 110,868 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,314 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,233 |
| Ancient Greek Words | 0 | - | 4.92 | 110,709 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,615 |
| History of London | 0 | - | 4.33 | 26,101 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,975 |
| Regions of France | 0 | - | 4.78 | 119,277 |
| France Immigration by Country | 0 | - | 4.72 | 75,969 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,469 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,591 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,621 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,831 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,049 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,192 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 101,969 |
| The UK for Americans - True or False | 0 | - | 4.46 | 58,394 |
| Champions League Winners | 0 | - | 4.92 | 996,457 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,337 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,046 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,405 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,874 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,827 |
| Monarchies of Europe | 0 | - | 4.90 | 97,332 |
| European Countries with One Border | 0 | - | 4.97 | 181,644 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,537 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,277 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,022 |
| Countries That Border Russia | 0 | - | 4.98 | 458,944 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,216 |
| History of Austria | 0 | - | 4.70 | 17,752 |
| Austria Country Quiz | 0 | - | 4.57 | 59,350 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,242 |
| France Country Quiz | 0 | - | 4.70 | 133,848 |
| French Inventions | 0 | - | 4.08 | 13,866 |
| Geography of the French Empire | 0 | - | 4.48 | 26,936 |
| The French Revolution | 0 | - | 4.46 | 23,785 |
| Countries Bordering France | 0 | - | 4.83 | 399,198 |
| History of Paris | 0 | - | 4.24 | 13,616 |
| History of France | 0 | - | 4.59 | 56,066 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,301 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,934 |
| Greece Country Quiz | 0 | - | 4.74 | 65,763 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,042 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,483 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,248 |
| Netherlands Country Quiz | 0 | - | 4.50 | 79,967 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,764 |
| The Vikings! | 0 | - | 4.46 | 28,246 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,702 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,349 |
| The Portuguese Empire | 0 | - | 4.54 | 11,991 |
| Spain Country Quiz | 0 | - | 4.45 | 127,618 |
| Switzerland Country Quiz | 0 | - | 4.51 | 62,943 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,108 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,227 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,568 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,176 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,433 |
| Counties of Wales | 0 | - | 4.63 | 38,905 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,909 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,256 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,124 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,575 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,236 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,191 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,833 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,264 |
| Russia Country Quiz | 0 | - | 4.85 | 113,647 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,857 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,041 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,627 |
| German History A-Z | 0 | - | 4.49 | 24,236 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,977 |
| History of Ireland | 0 | - | 4.39 | 30,830 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,961 |
| Byzantine History | 0 | - | 4.91 | 28,621 |
| Canary Islands | 0 | - | 4.61 | 17,404 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,900 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,156 |
| British Spellings | 0 | - | 4.07 | 99,218 |
| British Groups of Things | 0 | - | 4.25 | 82,676 |
| British Acronyms | 0 | - | 4.39 | 45,621 |
| UK Immigration by Country | 0 | - | 4.94 | 139,661 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,950 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,172 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.62 | 24,478 |
| Geography of Scotland | 0 | - | 4.63 | 21,481 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,507 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,655,062 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,271 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,795 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,599 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,861 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,065 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,845 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,981 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,785 |
| Countries that Border Poland | 0 | - | 4.99 | 171,365 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,382 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,909 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,514 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,704 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,620 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,543 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,764 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,517 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,784 |
| 20 Questions About France | 0 | - | 4.11 | 32,338 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,539 |
