| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,149 |
| States of Germany Map Quiz | 0 | - | 4.91 | 133,048 |
| States of Germany | 0 | - | 4.95 | 152,979 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,211 |
| History of Germany | 0 | - | 4.39 | 52,878 |
| Germany Country Quiz | 0 | - | 4.83 | 158,092 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,244 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 42,005 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,427 |
| Counties of England | 0 | - | 4.97 | 798,252 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,387 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,610 |
| Geography of the British Empire | 0 | - | 4.48 | 39,727 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,635 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,000 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,973 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,235 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,061 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,706 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,054 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,940 |
| Regions of Italy | 0 | - | 4.92 | 76,134 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,353 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,232 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,340 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,096 |
| Medieval English History | 0 | - | 4.53 | 43,559 |
| Europe Map Quiz | 0 | - | 5.00 | 4,768,471 |
| French History Multiple Choice | 0 | - | 4.55 | 33,104 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,319 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,253 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,549 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,749 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,024 |
| Departments of France | 0 | - | 4.93 | 54,357 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,539 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,503 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,571 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,225 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,596 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,057 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,880 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,884 |
| Name the English Monarchs | 0 | - | 4.91 | 503,563 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,774 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,177 |
| England or Wales? | 0 | - | 4.94 | 45,765 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,745 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,165 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,293 |
| History of Scotland | 0 | - | 4.51 | 21,116 |
| Kings of France Quiz | 0 | - | 4.20 | 32,798 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,659 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,149 |
| German Inventions | 0 | - | 3.91 | 30,245 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,646 |
| The Trojan War | 0 | - | 4.83 | 39,777 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,436 |
| Name that Greek Letter | 0 | - | 4.93 | 324,070 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,087 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,618 |
| Roman Emperors | 0 | - | 4.95 | 120,295 |
| Malta Country Quiz | 0 | - | 4.81 | 31,099 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,033 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,403 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,853 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,560 |
| The Only European Country ... | 0 | - | 4.91 | 217,186 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,448 |
| History of Russia Quiz | 0 | - | 4.47 | 31,943 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,337 |
| History of Italy | 0 | - | 4.55 | 32,037 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,708 |
| History of The Netherlands | 0 | - | 4.46 | 17,466 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,284 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,928 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,203 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,195 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,991 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,489 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,247,132 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,208 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,843 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,359 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,169 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,310 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,002 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,559 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,482 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,340 |
| Slavic Countries | 0 | - | 4.96 | 111,821 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,497 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,622 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,577 |
| Ancient Greek Words | 0 | - | 4.93 | 111,822 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,732 |
| History of London | 0 | - | 4.33 | 26,209 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 357,551 |
| Regions of France | 0 | - | 4.72 | 121,093 |
| France Immigration by Country | 0 | - | 4.70 | 76,635 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,104 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,695 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,232 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,464 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,321 |
| UK Cities Map Quiz | 0 | - | 4.96 | 464,970 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,379 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,673 |
| Champions League Winners | 0 | - | 4.91 | 1,008,935 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,998 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,754 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,593 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,930 |
| Monarchies of Europe | 0 | - | 4.90 | 98,279 |
| European Countries with One Border | 0 | - | 4.97 | 183,024 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,795 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,826 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,803 |
| Countries That Border Russia | 0 | - | 4.98 | 462,532 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,028 |
| History of Austria | 0 | - | 4.70 | 17,891 |
| Austria Country Quiz | 0 | - | 4.57 | 59,815 |
| Belgium Country Quiz | 0 | - | 4.72 | 71,901 |
| France Country Quiz | 0 | - | 4.70 | 135,120 |
| French Inventions | 0 | - | 4.08 | 13,904 |
| Geography of the French Empire | 0 | - | 4.45 | 27,147 |
| The French Revolution | 0 | - | 4.47 | 24,040 |
| Countries Bordering France | 0 | - | 4.83 | 403,268 |
| History of Paris | 0 | - | 4.24 | 13,657 |
| History of France | 0 | - | 4.59 | 57,211 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,896 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,353 |
| Greece Country Quiz | 0 | - | 4.74 | 66,339 |
| Italy Country Quiz | 0 | - | 4.77 | 123,553 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,120 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,810 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,549 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,607 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,515 |
| The Vikings! | 0 | - | 4.46 | 28,364 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,189 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,987 |
| The Portuguese Empire | 0 | - | 4.58 | 12,080 |
| Spain Country Quiz | 0 | - | 4.44 | 128,700 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,426 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,038 |
| United Kingdom A-Z | 0 | - | 4.52 | 88,119 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,758 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,354 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,730 |
| Counties of Wales | 0 | - | 4.63 | 39,358 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,017 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,250 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,170 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,727 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,208 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,457 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,729 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,938 |
| Russia Country Quiz | 0 | - | 4.83 | 114,632 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,434 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,398 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,847 |
| German History A-Z | 0 | - | 4.49 | 24,645 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,821 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,342 |
| History of Ireland | 0 | - | 4.39 | 31,254 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,389 |
| Byzantine History | 0 | - | 4.91 | 28,905 |
| Byzantine Emperors | 0 | - | 4.92 | 14,324 |
| Canary Islands | 0 | - | 4.62 | 17,489 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,190 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,791 |
| British Spellings | 0 | - | 4.06 | 99,487 |
| British Groups of Things | 0 | - | 4.25 | 82,898 |
| British Acronyms | 0 | - | 4.40 | 45,828 |
| UK Immigration by Country | 0 | - | 4.94 | 141,077 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,051 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,070 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,336 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,904 |
| Geography of Scotland | 0 | - | 4.63 | 21,645 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,834 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,705,518 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,993 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,165 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,669 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,475 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,426 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,576 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,283 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,368 |
| Countries that Border Poland | 0 | - | 4.99 | 172,513 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,938 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,996 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,321 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,362 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,910 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,864 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,591 |
