| States of Germany Map Quiz | 0 | - | 4.91 | 131,658 |
| States of Germany | 0 | - | 4.96 | 149,973 |
| Germany Immigration by Country | 0 | - | 4.84 | 79,992 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,512 |
| Germany Country Quiz | 0 | - | 4.82 | 156,491 |
| Name the English Monarchs | 0 | - | 4.92 | 497,760 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,341 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,118 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,465 |
| History of Germany | 0 | - | 4.39 | 52,611 |
| The Trojan War | 0 | - | 4.83 | 39,422 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,496 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,032 |
| Roman Emperors | 0 | - | 4.95 | 118,421 |
| Counties of England | 0 | - | 4.97 | 788,939 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,763 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,765 |
| Medieval English History | 0 | - | 4.53 | 43,311 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,897 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,384 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,344 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,070 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,983 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,086 |
| French History Multiple Choice | 0 | - | 4.55 | 32,867 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,949 |
| Regions of Italy | 0 | - | 4.92 | 74,672 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,785 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,283 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,107 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,886 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,948 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,827 |
| Europe Map Quiz | 0 | - | 5.00 | 4,730,160 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,142 |
| Departments of France | 0 | - | 4.93 | 52,762 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,115 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,420 |
| Italy Country Quiz | 0 | - | 4.82 | 122,155 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,325 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,034 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,357 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,932 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,610 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,216 |
| England or Wales? | 0 | - | 4.94 | 45,306 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,128 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,238 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,167 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,750 |
| Geography of the British Empire | 0 | - | 4.48 | 39,467 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,108 |
| History of Scotland | 0 | - | 4.51 | 20,997 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,083 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,375 |
| Kings of France Quiz | 0 | - | 4.20 | 32,548 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,382 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,335 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,439 |
| German Inventions | 0 | - | 3.91 | 30,179 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,568 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,714 |
| Name that Greek Letter | 0 | - | 4.94 | 321,591 |
| Malta Country Quiz | 0 | - | 4.81 | 30,821 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,911 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,244 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,485 |
| The Only European Country ... | 0 | - | 4.91 | 213,732 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,467 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,803 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,216 |
| History of The Netherlands | 0 | - | 4.46 | 17,305 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,088 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,225,937 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,319,462 |
| History of Russia Quiz | 0 | - | 4.49 | 31,786 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,302 |
| Ancient Greek Words | 0 | - | 4.92 | 110,648 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 72,873 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,425 |
| History of Italy | 0 | - | 4.55 | 31,809 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,527 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,657 |
| Roman Names for Places | 0 | - | 4.62 | 57,862 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,477 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,975 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,379 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,607 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,685 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,072 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,289 |
| History of London | 0 | - | 4.33 | 26,096 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,699 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,677 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,257 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,242 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,449 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,757 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,794 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,220 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,165 |
| Slavic Countries | 0 | - | 4.96 | 110,826 |
| Regions of France | 0 | - | 4.78 | 119,179 |
| France Immigration by Country | 0 | - | 4.72 | 75,946 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,665 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,443 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,420 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,607 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,764 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,039 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,068 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 101,927 |
| The UK for Americans - True or False | 0 | - | 4.46 | 58,381 |
| Champions League Winners | 0 | - | 4.92 | 995,986 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,312 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,022 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,329 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,806 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,764 |
| Monarchies of Europe | 0 | - | 4.90 | 97,288 |
| European Countries with One Border | 0 | - | 4.97 | 181,580 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,489 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,199 |
| Federal Subjects of Russia | 0 | - | 4.94 | 143,911 |
| Countries That Border Russia | 0 | - | 4.98 | 458,816 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,162 |
| History of Austria | 0 | - | 4.70 | 17,743 |
| Austria Country Quiz | 0 | - | 4.57 | 59,323 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,214 |
| France Country Quiz | 0 | - | 4.70 | 133,795 |
| French Inventions | 0 | - | 4.08 | 13,863 |
| Geography of the French Empire | 0 | - | 4.48 | 26,923 |
| The French Revolution | 0 | - | 4.46 | 23,774 |
| Countries Bordering France | 0 | - | 4.83 | 398,644 |
| History of Paris | 0 | - | 4.24 | 13,612 |
| History of France | 0 | - | 4.59 | 55,987 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,241 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,923 |
| Greece Country Quiz | 0 | - | 4.74 | 65,739 |
| The Life of Alexander the Great | 0 | - | 4.49 | 18,420 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,869 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,037 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,115 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,470 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,228 |
| Netherlands Country Quiz | 0 | - | 4.50 | 79,943 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,743 |
| The Vikings! | 0 | - | 4.45 | 28,244 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,683 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,322 |
| The Portuguese Empire | 0 | - | 4.54 | 11,987 |
| Spain Country Quiz | 0 | - | 4.45 | 127,569 |
| Switzerland Country Quiz | 0 | - | 4.51 | 62,924 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,044 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,202 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,559 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,167 |
| English Royal Consorts | 0 | - | 4.37 | 37,157 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,601 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,400 |
| Counties of Wales | 0 | - | 4.63 | 38,884 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,837 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,652,767 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,218 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,216 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,091 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,781 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,827 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,778 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,436 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,142 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,105 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,937 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,636 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,188 |
| Countries that Border Poland | 0 | - | 4.99 | 171,310 |
| Russia Country Quiz | 0 | - | 4.85 | 113,612 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,360 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,366 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,830 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,674 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,023 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,719 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,507 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,751 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,510 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,786 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,621 |
| German History A-Z | 0 | - | 4.49 | 24,211 |
| Counties of Ireland | 0 | - | 4.92 | 192,978 |
| History of Ireland | 0 | - | 4.39 | 30,818 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,427 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,932 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,264 |
| Byzantine History | 0 | - | 4.91 | 28,610 |
| Canary Islands | 0 | - | 4.61 | 17,397 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,746 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,242 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,132 |
| British Spellings | 0 | - | 4.07 | 99,200 |
