| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,981 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,763 |
| States of Germany | 0 | - | 4.96 | 152,434 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,007 |
| History of Germany | 0 | - | 4.39 | 52,813 |
| Germany Country Quiz | 0 | - | 4.82 | 157,804 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,086 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,815 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,251 |
| Counties of England | 0 | - | 4.97 | 796,363 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,347 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,442 |
| Geography of the British Empire | 0 | - | 4.48 | 39,667 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,165 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,392 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,596 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,939 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,822 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,369 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,987 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,909 |
| Regions of Italy | 0 | - | 4.92 | 75,833 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,119 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,906 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,179 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,974 |
| Medieval English History | 0 | - | 4.53 | 43,501 |
| Europe Map Quiz | 0 | - | 5.00 | 4,761,628 |
| French History Multiple Choice | 0 | - | 4.55 | 33,030 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,302 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,207 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,481 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,672 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,700 |
| Departments of France | 0 | - | 4.93 | 54,059 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,300 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 74,099 |
| Italy Country Quiz | 0 | - | 4.82 | 123,373 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,317 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,995 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,541 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,898 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,618 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,534 |
| Name the English Monarchs | 0 | - | 4.91 | 502,440 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,745 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,147 |
| England or Wales? | 0 | - | 4.94 | 45,673 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,084 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,582 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,259 |
| History of Scotland | 0 | - | 4.51 | 21,088 |
| Kings of France Quiz | 0 | - | 4.20 | 32,736 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,359 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,019 |
| German Inventions | 0 | - | 3.91 | 30,235 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,627 |
| The Trojan War | 0 | - | 4.83 | 39,715 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,168 |
| Name that Greek Letter | 0 | - | 4.93 | 323,376 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,789 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,512 |
| Roman Emperors | 0 | - | 4.95 | 119,980 |
| Malta Country Quiz | 0 | - | 4.81 | 31,045 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,944 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,366 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,168 |
| The Only European Country ... | 0 | - | 4.91 | 216,512 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,059 |
| History of Russia Quiz | 0 | - | 4.47 | 31,913 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,895 |
| History of Italy | 0 | - | 4.55 | 31,968 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,652 |
| History of The Netherlands | 0 | - | 4.46 | 17,429 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,221 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,855 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,180 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,137 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,952 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,259 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,243,397 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,328,318 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,626 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,168 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,612 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,122 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,415 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,578 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,237 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,154 |
| Slavic Countries | 0 | - | 4.96 | 111,622 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,473 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,551 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,628 |
| Ancient Greek Words | 0 | - | 4.93 | 111,548 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,712 |
| History of London | 0 | - | 4.33 | 26,189 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,714 |
| Regions of France | 0 | - | 4.72 | 120,724 |
| France Immigration by Country | 0 | - | 4.70 | 76,493 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,990 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,953 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,114 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,332 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,259 |
| UK Cities Map Quiz | 0 | - | 4.96 | 464,446 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,213 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,621 |
| Champions League Winners | 0 | - | 4.92 | 1,006,235 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,818 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,478 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,245 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,708 |
| Monarchies of Europe | 0 | - | 4.90 | 98,112 |
| European Countries with One Border | 0 | - | 4.97 | 182,729 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,528 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 78,402 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,044 |
| Countries That Border Russia | 0 | - | 4.98 | 461,624 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,870 |
| History of Austria | 0 | - | 4.70 | 17,859 |
| Austria Country Quiz | 0 | - | 4.57 | 59,719 |
| Belgium Country Quiz | 0 | - | 4.73 | 71,778 |
| France Country Quiz | 0 | - | 4.70 | 134,944 |
| French Inventions | 0 | - | 4.08 | 13,897 |
| Geography of the French Empire | 0 | - | 4.45 | 27,056 |
| The French Revolution | 0 | - | 4.46 | 23,927 |
| Countries Bordering France | 0 | - | 4.83 | 402,440 |
| History of Paris | 0 | - | 4.24 | 13,646 |
| History of France | 0 | - | 4.59 | 56,948 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,816 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,291 |
| Greece Country Quiz | 0 | - | 4.74 | 66,236 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,100 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,743 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,492 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,505 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,451 |
| The Vikings! | 0 | - | 4.46 | 28,341 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,117 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,877 |
| The Portuguese Empire | 0 | - | 4.58 | 12,063 |
| Spain Country Quiz | 0 | - | 4.45 | 128,501 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,354 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,570 |
| United Kingdom A-Z | 0 | - | 4.52 | 88,019 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,714 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,316 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,691 |
| Counties of Wales | 0 | - | 4.63 | 39,260 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,816 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,081 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,961 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,146 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,749 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,052 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,817 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,645 |
| Russia Country Quiz | 0 | - | 4.85 | 114,442 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,319 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,332 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,788 |
| German History A-Z | 0 | - | 4.49 | 24,601 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,867 |
| History of Ireland | 0 | - | 4.39 | 31,164 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,317 |
| Byzantine History | 0 | - | 4.91 | 28,851 |
| Byzantine Emperors | 0 | - | 4.92 | 13,981 |
| Canary Islands | 0 | - | 4.62 | 17,476 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,948 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,690 |
| British Spellings | 0 | - | 4.06 | 99,445 |
| British Groups of Things | 0 | - | 4.25 | 82,862 |
| British Acronyms | 0 | - | 4.40 | 45,793 |
| UK Immigration by Country | 0 | - | 4.94 | 140,862 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,034 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 139,729 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,163 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,760 |
| Geography of Scotland | 0 | - | 4.63 | 21,613 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,277 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,696,476 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,745 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,096 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,654 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,365 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,891 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,424 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,013 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,243 |
| Countries that Border Poland | 0 | - | 4.99 | 172,240 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,829 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,746 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,723 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,199 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,863 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,796 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,373 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,763 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,294 |
