| States of the German Confederation in 1848 | 0 | - | 4.90 | 31,788 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,266 |
| States of Germany | 0 | - | 4.96 | 151,261 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,637 |
| History of Germany | 0 | - | 4.39 | 52,737 |
| Germany Country Quiz | 0 | - | 4.82 | 157,272 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,754 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,387 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,903 |
| Counties of England | 0 | - | 4.97 | 793,045 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,275 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,149 |
| Geography of the British Empire | 0 | - | 4.48 | 39,593 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,610 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,927 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,036 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,542 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,432 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,893 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,880 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,848 |
| Regions of Italy | 0 | - | 4.92 | 75,290 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 50,488 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,280 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,792 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,386 |
| Medieval English History | 0 | - | 4.53 | 43,416 |
| Europe Map Quiz | 0 | - | 5.00 | 4,748,064 |
| French History Multiple Choice | 0 | - | 4.55 | 32,961 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,126 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,158 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,310 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,100 |
| Departments of France | 0 | - | 4.93 | 53,435 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,649 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,251 |
| Italy Country Quiz | 0 | - | 4.82 | 122,759 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,896 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,564 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,459 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,485 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,111 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,942 |
| Name the English Monarchs | 0 | - | 4.92 | 500,415 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,726 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,115 |
| England or Wales? | 0 | - | 4.94 | 45,510 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,735 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,440 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,561 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,195 |
| History of Scotland | 0 | - | 4.51 | 21,052 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,549 |
| Kings of France Quiz | 0 | - | 4.20 | 32,638 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,886 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,794 |
| German Inventions | 0 | - | 3.91 | 30,211 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,605 |
| The Trojan War | 0 | - | 4.83 | 39,587 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,956 |
| Name that Greek Letter | 0 | - | 4.93 | 322,660 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,247 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,317 |
| Roman Emperors | 0 | - | 4.95 | 119,366 |
| Malta Country Quiz | 0 | - | 4.81 | 30,950 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,075 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,385 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,416 |
| The Only European Country ... | 0 | - | 4.91 | 215,339 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,434 |
| History of Russia Quiz | 0 | - | 4.49 | 31,855 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,176 |
| History of Italy | 0 | - | 4.55 | 31,910 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,582 |
| History of The Netherlands | 0 | - | 4.46 | 17,373 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,107 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,738 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,138 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,058 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,904 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 67,876 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,235,803 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,977 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,208 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,755 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,589 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,818 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,480 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 169,686 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,809 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,571 |
| Slavic Countries | 0 | - | 4.96 | 111,307 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,433 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,662 |
| Ancient Greek Words | 0 | - | 4.93 | 111,159 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,673 |
| History of London | 0 | - | 4.33 | 26,140 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 352,877 |
| Regions of France | 0 | - | 4.77 | 120,050 |
| France Immigration by Country | 0 | - | 4.72 | 76,257 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,758 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,351 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,865 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,107 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,165 |
| UK Cities Map Quiz | 0 | - | 4.96 | 463,504 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,875 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,519 |
| Champions League Winners | 0 | - | 4.92 | 1,001,335 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,644 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,479 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,000 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,593 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,294 |
| Monarchies of Europe | 0 | - | 4.90 | 97,748 |
| European Countries with One Border | 0 | - | 4.97 | 182,211 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,068 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,733 |
| Federal Subjects of Russia | 0 | - | 4.94 | 145,537 |
| Countries That Border Russia | 0 | - | 4.98 | 460,505 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,569 |
| History of Austria | 0 | - | 4.70 | 17,810 |
| Austria Country Quiz | 0 | - | 4.57 | 59,553 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,525 |
| France Country Quiz | 0 | - | 4.70 | 134,550 |
| French Inventions | 0 | - | 4.08 | 13,881 |
| Geography of the French Empire | 0 | - | 4.45 | 27,004 |
| The French Revolution | 0 | - | 4.46 | 23,872 |
| Countries Bordering France | 0 | - | 4.83 | 401,302 |
| History of Paris | 0 | - | 4.24 | 13,631 |
| History of France | 0 | - | 4.59 | 56,662 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,630 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,134 |
| Greece Country Quiz | 0 | - | 4.74 | 66,014 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,073 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,625 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,377 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,269 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,287 |
| The Vikings! | 0 | - | 4.46 | 28,291 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,924 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,627 |
| The Portuguese Empire | 0 | - | 4.58 | 12,034 |
| Spain Country Quiz | 0 | - | 4.45 | 128,108 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,161 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,730 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,464 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,643 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,264 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,625 |
| Counties of Wales | 0 | - | 4.63 | 39,082 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,390 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,692 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,562 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,975 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,829 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,205 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 259,007 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,015 |
| Russia Country Quiz | 0 | - | 4.85 | 114,093 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,132 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,214 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,727 |
| German History A-Z | 0 | - | 4.49 | 24,524 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,963 |
| History of Ireland | 0 | - | 4.39 | 31,029 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,164 |
| Byzantine History | 0 | - | 4.91 | 28,718 |
| Canary Islands | 0 | - | 4.61 | 17,444 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,501 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,474 |
| British Spellings | 0 | - | 4.06 | 99,365 |
| British Groups of Things | 0 | - | 4.25 | 82,795 |
| British Acronyms | 0 | - | 4.39 | 45,718 |
| UK Immigration by Country | 0 | - | 4.94 | 140,439 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,999 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 139,054 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,856 |
| Geography of Scotland | 0 | - | 4.63 | 21,563 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 129,364 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,677,248 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,972 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,952 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,630 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,148 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,967 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,174 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,560 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,040 |
| Countries that Border Poland | 0 | - | 4.99 | 171,847 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,599 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,297 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,683 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,966 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,739 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,682 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,107 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,653 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,058 |
| 20 Questions About France | 0 | - | 4.11 | 32,368 |
