| Name the English Monarchs | 0 | - | 4.91 | 504,153 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,216 |
| The Trojan War | 0 | - | 4.83 | 39,808 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,295 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,664 |
| Roman Emperors | 0 | - | 4.95 | 120,442 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,776 |
| Germany Country Quiz | 0 | - | 4.83 | 158,223 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,443 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,771 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,087 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,951 |
| Medieval English History | 0 | - | 4.53 | 43,578 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,791 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,612 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,142 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,358 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,172 |
| Countries Bordering France | 0 | - | 4.83 | 403,655 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,254 |
| States of Germany | 0 | - | 4.95 | 153,302 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,309 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,924 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,720 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,798 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,999 |
| Roman Names for Places | 0 | - | 4.62 | 58,418 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,852 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,789 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,214 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,005 |
| Europe Map Quiz | 0 | - | 5.00 | 4,772,546 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,792 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,211 |
| Departments of France | 0 | - | 4.93 | 54,515 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,668 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,673 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,704 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,646 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,621 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,135 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,272 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,044 |
| England or Wales? | 0 | - | 4.94 | 45,812 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,594 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,873 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,679 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,976 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,291 |
| Counties of Ireland | 0 | - | 4.92 | 196,126 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,036 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,390 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,409 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,348 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,304 |
| History of Scotland | 0 | - | 4.51 | 21,135 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,814 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,029 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,201 |
| Kings of France Quiz | 0 | - | 4.20 | 32,825 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,034 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,877 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,217 |
| German Inventions | 0 | - | 3.91 | 30,254 |
| Embarrassing Chapters in German History | 0 | - | 3.40 | 12,650 |
| The Life of Alexander the Great | 0 | - | 4.51 | 18,524 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,102 |
| Name that Greek Letter | 0 | - | 4.93 | 324,226 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,434 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,670 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,206 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,538 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,090 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,736 |
| English Royal Consorts | 0 | - | 4.38 | 37,420 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,654 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,134 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,754 |
| The Only European Country ... | 0 | - | 4.91 | 217,509 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,647 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,028 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,566 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,249,218 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,331,102 |
| History of Russia Quiz | 0 | - | 4.47 | 31,957 |
| French History Multiple Choice | 0 | - | 4.55 | 33,133 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,647 |
| History of Germany | 0 | - | 4.39 | 52,906 |
| Ancient Greek Words | 0 | - | 4.93 | 111,941 |
| History of Italy | 0 | - | 4.55 | 32,062 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,725 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,305 |
| Counties of England | 0 | - | 4.97 | 799,194 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,967 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,746 |
| History of London | 0 | - | 4.33 | 26,225 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,773 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 358,374 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,963 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,473 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,487 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,384 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,497 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 173,370 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,613 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,448 |
| Slavic Countries | 0 | - | 4.96 | 111,928 |
| Most Popular Baby Boy Names in Germany | 0 | - | 4.34 | 67,138 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,512 |
| Ancient Greece A-Z | 0 | - | 4.60 | 23,182 |
| Ancient Greek Inventions | 0 | - | 4.18 | 16,375 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,171 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,290 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,276 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,803 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,535 |
| Champions League Winners | 0 | - | 4.92 | 1,010,225 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 97,982 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,072 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,892 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,765 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,029 |
| Monarchies of Europe | 0 | - | 4.90 | 98,382 |
| European Countries with One Border | 0 | - | 4.97 | 183,160 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,941 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 87,091 |
| Federal Subjects of Russia | 0 | - | 4.95 | 148,114 |
| Countries That Border Russia | 0 | - | 4.98 | 462,927 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,132 |
| History of Austria | 0 | - | 4.70 | 17,913 |
| Austria Country Quiz | 0 | - | 4.57 | 59,856 |
| Belgium Country Quiz | 0 | - | 4.72 | 71,965 |
| France Country Quiz | 0 | - | 4.70 | 135,224 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,893 |
| Geography of the French Empire | 0 | - | 4.45 | 27,158 |
| The French Revolution | 0 | - | 4.47 | 24,071 |
| History of France | 0 | - | 4.61 | 57,300 |
| French History A-Z | 0 | - | 4.27 | 24,777 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,936 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,396 |
| Greece Country Quiz | 0 | - | 4.74 | 66,387 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,849 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,806 |
| Regions of Italy | 0 | - | 4.92 | 76,306 |
| Italy Country Quiz | 0 | - | 4.77 | 123,643 |
| Luxembourg Country Quiz | 0 | - | 4.78 | 33,831 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,575 |
| Netherlands Country Quiz | 0 | - | 4.53 | 80,675 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,461 |
| Nordic Cities Map Quiz | 0 | - | 4.77 | 90,563 |
| The Vikings! | 0 | - | 4.46 | 28,372 |
| Sweden Immigration by Country | 0 | - | 4.55 | 56,222 |
| Portugal Country Quiz | 0 | - | 4.69 | 72,044 |
| The Portuguese Empire | 0 | - | 4.58 | 12,086 |
| Spain Country Quiz | 0 | - | 4.44 | 128,821 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,473 |
| Switzerland Country Quiz | 0 | - | 4.51 | 63,474 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,434 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,180 |
| United Kingdom A-Z | 0 | - | 4.52 | 88,174 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,770 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,410 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,722 |
| Geography of the British Empire | 0 | - | 4.48 | 39,744 |
| Animals in British History | 0 | - | 4.43 | 26,045 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,760 |
| Counties of Wales | 0 | - | 4.63 | 39,394 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,709,855 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,288 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,384 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,292 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,198 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,533 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,660 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,019 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,448 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,727 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,414 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,421 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,091 |
| Countries that Border Poland | 0 | - | 4.99 | 172,648 |
| Russia Country Quiz | 0 | - | 4.83 | 114,734 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,999 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,609 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,503 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,452 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,423 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,687 |
| Famous Germans by Picture | 0 | - | 4.12 | 16,863 |
| German History A-Z | 0 | - | 4.49 | 24,668 |
| History of Ireland | 0 | - | 4.39 | 31,296 |
| Italian History A-Z | 0 | - | 4.21 | 17,742 |
| Byzantine History | 0 | - | 4.91 | 28,920 |
| Byzantine Emperors | 0 | - | 4.92 | 14,382 |
| History of The Netherlands | 0 | - | 4.46 | 17,491 |
| Denmark Country Quiz | 0 | - | 4.78 | 76,042 |
| Finland Country Quiz | 0 | - | 4.50 | 59,801 |
| Norway Country Quiz | 0 | - | 4.44 | 77,523 |
| Iceland Country Quiz | 0 | - | 4.69 | 43,256 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,298 |
