| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,364 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,602 |
| States of Germany | 0 | - | 4.95 | 154,105 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,574 |
| History of Germany | 0 | - | 4.39 | 52,953 |
| Germany Country Quiz | 0 | - | 4.82 | 158,631 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,540 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,285 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,750 |
| Counties of England | 0 | - | 4.97 | 801,592 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,440 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,142 |
| Geography of the British Empire | 0 | - | 4.48 | 39,822 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,139 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,860 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,553 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,671 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,427 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,418 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,187 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,012 |
| Regions of Italy | 0 | - | 4.92 | 76,776 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,683 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,093 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,634 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,411 |
| Medieval English History | 0 | - | 4.53 | 43,626 |
| Europe Map Quiz | 0 | - | 5.00 | 4,781,911 |
| French History Multiple Choice | 0 | - | 4.55 | 33,191 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,445 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,311 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,701 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,886 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,577 |
| Departments of France | 0 | - | 4.93 | 54,912 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,940 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 75,040 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,052 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,905 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,712 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,355 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,657 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,521 |
| Name the English Monarchs | 0 | - | 4.91 | 505,597 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,811 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,228 |
| England or Wales? | 0 | - | 4.94 | 45,907 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,351 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,546 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,206 |
| Embarrassing Chapters in British History | 0 | - | 4.30 | 32,352 |
| History of Scotland | 0 | - | 4.51 | 21,158 |
| Kings of France Quiz | 0 | - | 4.20 | 32,887 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,149 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,466 |
| German Inventions | 0 | - | 3.91 | 30,277 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,676 |
| The Trojan War | 0 | - | 4.83 | 39,942 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,916 |
| Name that Greek Letter | 0 | - | 4.93 | 324,736 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,731 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,505 |
| Roman Emperors | 0 | - | 4.95 | 120,958 |
| Malta Country Quiz | 0 | - | 4.81 | 31,208 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,395 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,836 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,810 |
| The Only European Country ... | 0 | - | 4.91 | 218,497 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,227 |
| History of Russia Quiz | 0 | - | 4.47 | 31,988 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,217 |
| History of Italy | 0 | - | 4.55 | 32,117 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,790 |
| History of The Netherlands | 0 | - | 4.46 | 17,531 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,398 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,053 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,251 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,281 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,058 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,880 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,254,541 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,334,071 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,333 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,874 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,345 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,638 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,302 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 175,136 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,986 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,667 |
| Slavic Countries | 0 | - | 4.96 | 112,219 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.40 | 82,732 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,154 |
| Ancient Greek Words | 0 | - | 4.93 | 112,289 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,801 |
| History of London | 0 | - | 4.33 | 26,252 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 360,400 |
| Regions of France | 0 | - | 4.70 | 121,811 |
| France Immigration by Country | 0 | - | 4.70 | 76,847 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,361 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,220 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,430 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,657 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,385 |
| UK Cities Map Quiz | 0 | - | 4.96 | 466,033 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,682 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,772 |
| Champions League Winners | 0 | - | 4.92 | 1,013,918 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,596 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,362 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,276 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,288 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,322 |
| Monarchies of Europe | 0 | - | 4.90 | 98,699 |
| European Countries with One Border | 0 | - | 4.97 | 183,550 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,312 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,332 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,054 |
| Countries That Border Russia | 0 | - | 4.98 | 464,046 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,357 |
| History of Austria | 0 | - | 4.70 | 17,959 |
| Austria Country Quiz | 0 | - | 4.57 | 59,990 |
| Belgium Country Quiz | 0 | - | 4.72 | 72,160 |
| France Country Quiz | 0 | - | 4.70 | 135,486 |
| French Inventions | 0 | - | 4.10 | 13,919 |
| Geography of the French Empire | 0 | - | 4.45 | 27,201 |
| The French Revolution | 0 | - | 4.47 | 24,120 |
| Countries Bordering France | 0 | - | 4.83 | 404,479 |
| History of Paris | 0 | - | 4.24 | 13,670 |
| History of France | 0 | - | 4.61 | 57,499 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 49,051 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,522 |
| Greece Country Quiz | 0 | - | 4.74 | 66,564 |
| Italy Country Quiz | 0 | - | 4.77 | 123,919 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,152 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,908 |
| Monaco Country Quiz | 0 | - | 4.48 | 41,651 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,847 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,670 |
| The Vikings! | 0 | - | 4.46 | 28,396 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,326 |
| Portugal Country Quiz | 0 | - | 4.69 | 72,227 |
| The Portuguese Empire | 0 | - | 4.58 | 12,096 |
| Spain Country Quiz | 0 | - | 4.44 | 129,096 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,585 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,734 |
| United Kingdom A-Z | 0 | - | 4.51 | 88,288 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,821 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,426 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,816 |
| Counties of Wales | 0 | - | 4.63 | 39,531 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,687 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,631 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,252 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 278,538 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,529 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 263,925 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,670 |
| Russia Country Quiz | 0 | - | 4.83 | 115,177 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,648 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,516 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,956 |
| German History A-Z | 0 | - | 4.49 | 24,870 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,934 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,468 |
| History of Ireland | 0 | - | 4.39 | 31,381 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,573 |
| Byzantine History | 0 | - | 4.91 | 28,997 |
| Byzantine Emperors | 0 | - | 4.93 | 14,525 |
| Canary Islands | 0 | - | 4.62 | 17,514 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,652 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,986 |
| British Spellings | 0 | - | 4.06 | 99,572 |
| British Groups of Things | 0 | - | 4.25 | 82,979 |
| British Acronyms | 0 | - | 4.40 | 45,905 |
| UK Immigration by Country | 0 | - | 4.94 | 141,514 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,089 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,737 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,624 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,060 |
| Geography of Scotland | 0 | - | 4.63 | 21,711 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,731 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,364 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,720,032 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,599 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,298 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,708 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,651 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 116,352 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,822 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,848 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,575 |
| Countries that Border Poland | 0 | - | 4.99 | 173,000 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,174 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,430 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,408 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,911 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,002 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,980 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,945 |
