| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,743 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,147 |
| States of Germany | 0 | - | 4.96 | 151,082 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,503 |
| History of Germany | 0 | - | 4.39 | 52,726 |
| Germany Country Quiz | 0 | - | 4.82 | 157,183 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,686 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,850 |
| Counties of England | 0 | - | 4.97 | 792,570 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,264 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,095 |
| Geography of the British Empire | 0 | - | 4.48 | 39,584 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,870 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,842 |
| Medieval English History | 0 | - | 4.53 | 43,403 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,538 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 75,866 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,959 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,490 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,381 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,775 |
| French History Multiple Choice | 0 | - | 4.55 | 32,946 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,007 |
| Regions of Italy | 0 | - | 4.92 | 75,210 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 48,158 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,175 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,727 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,347 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,154 |
| Europe Map Quiz | 0 | - | 5.00 | 4,745,962 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,706 |
| Departments of France | 0 | - | 4.93 | 53,301 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,559 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,157 |
| Italy Country Quiz | 0 | - | 4.82 | 122,678 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,827 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,460 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,438 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,426 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,045 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,864 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,725 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,112 |
| England or Wales? | 0 | - | 4.94 | 45,491 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,294 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,414 |
| Name the English Monarchs | 0 | - | 4.92 | 500,126 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,185 |
| History of Scotland | 0 | - | 4.51 | 21,046 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,564 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,534 |
| Kings of France Quiz | 0 | - | 4.20 | 32,631 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,423 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,818 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,753 |
| German Inventions | 0 | - | 3.91 | 30,208 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,597 |
| The Trojan War | 0 | - | 4.83 | 39,567 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,631 |
| Name that Greek Letter | 0 | - | 4.93 | 322,549 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,167 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,288 |
| Roman Emperors | 0 | - | 4.95 | 119,243 |
| Malta Country Quiz | 0 | - | 4.81 | 30,938 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,939 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,228 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,315 |
| The Only European Country ... | 0 | - | 4.91 | 215,144 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,322 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,425 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,077 |
| History of The Netherlands | 0 | - | 4.46 | 17,361 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,131 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,234,667 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,507 |
| History of Russia Quiz | 0 | - | 4.49 | 31,844 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,417 |
| Ancient Greek Words | 0 | - | 4.93 | 111,099 |
| History of Italy | 0 | - | 4.55 | 31,898 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,567 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,092 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,716 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,667 |
| History of London | 0 | - | 4.33 | 26,132 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,049 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,895 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 352,507 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,157 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,704 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,442 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,760 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,322 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 169,473 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,741 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,528 |
| Slavic Countries | 0 | - | 4.96 | 111,259 |
| Regions of France | 0 | - | 4.77 | 119,967 |
| France Immigration by Country | 0 | - | 4.72 | 76,200 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,727 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,152 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,836 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,061 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,155 |
| UK Cities Map Quiz | 0 | - | 4.96 | 463,285 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 102,828 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,506 |
| Champions League Winners | 0 | - | 4.92 | 1,000,704 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,619 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,412 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,920 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,501 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,236 |
| Monarchies of Europe | 0 | - | 4.90 | 97,702 |
| European Countries with One Border | 0 | - | 4.97 | 182,119 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,985 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 76,688 |
| Federal Subjects of Russia | 0 | - | 4.94 | 145,314 |
| Countries That Border Russia | 0 | - | 4.98 | 460,345 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,536 |
| History of Austria | 0 | - | 4.70 | 17,800 |
| Austria Country Quiz | 0 | - | 4.57 | 59,533 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,490 |
| France Country Quiz | 0 | - | 4.70 | 134,491 |
| French Inventions | 0 | - | 4.08 | 13,876 |
| Geography of the French Empire | 0 | - | 4.45 | 26,999 |
| The French Revolution | 0 | - | 4.46 | 23,862 |
| Countries Bordering France | 0 | - | 4.83 | 401,131 |
| History of Paris | 0 | - | 4.24 | 13,629 |
| History of France | 0 | - | 4.59 | 56,630 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,598 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,102 |
| Greece Country Quiz | 0 | - | 4.74 | 65,986 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,853 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,067 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,613 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,365 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,230 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,258 |
| The Vikings! | 0 | - | 4.46 | 28,287 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,875 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,590 |
| The Portuguese Empire | 0 | - | 4.58 | 12,028 |
| Spain Country Quiz | 0 | - | 4.45 | 128,045 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,132 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,667 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,440 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,628 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,259 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,618 |
| Counties of Wales | 0 | - | 4.63 | 39,067 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,313 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,674,091 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,788 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,640 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,493 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,933 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,097 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,128 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,787 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,726 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,085 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,479 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,722 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,910 |
| Countries that Border Poland | 0 | - | 4.99 | 171,787 |
| Russia Country Quiz | 0 | - | 4.85 | 114,044 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,566 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,544 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,094 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,932 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,191 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,063 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,634 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,027 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,698 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,975 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,068 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,721 |
| German History A-Z | 0 | - | 4.49 | 24,518 |
| Counties of Ireland | 0 | - | 4.92 | 194,038 |
| History of Ireland | 0 | - | 4.39 | 31,010 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,635 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,147 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,903 |
| Byzantine History | 0 | - | 4.91 | 28,704 |
| Canary Islands | 0 | - | 4.61 | 17,438 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,432 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,229 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,411 |
| British Spellings | 0 | - | 4.06 | 99,356 |
| British Groups of Things | 0 | - | 4.25 | 82,778 |
| British Acronyms | 0 | - | 4.39 | 45,703 |
| UK Immigration by Country | 0 | - | 4.94 | 140,360 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,994 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,964 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 24,811 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,491 |
| Geography of Scotland | 0 | - | 4.63 | 21,547 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,056 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,007 |
