| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,531 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,870 |
| Geography of the French Empire | 0 | - | 4.45 | 27,241 |
| The French Revolution | 0 | - | 4.47 | 24,175 |
| Counties of England | 0 | - | 4.97 | 804,715 |
| History of France | 0 | - | 4.61 | 57,765 |
| History of Italy | 0 | - | 4.55 | 32,198 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,866 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,481 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,156 |
| Europe Map Quiz | 0 | - | 5.00 | 4,795,092 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,645 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,245 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,089 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,078 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,783 |
| States of Germany Map Quiz | 0 | - | 4.92 | 134,044 |
| States of Germany | 0 | - | 4.95 | 155,042 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,855 |
| Regions of Italy | 0 | - | 4.92 | 77,315 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,961 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,676 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,954 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,693 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,879 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,841 |
| Regions of France | 0 | - | 4.70 | 122,495 |
| France Immigration by Country | 0 | - | 4.70 | 77,039 |
| Departments of France | 0 | - | 4.93 | 55,461 |
| Countries Bordering France | 0 | - | 4.83 | 405,490 |
| French History Multiple Choice | 0 | - | 4.55 | 33,284 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,562 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,581 |
| The Vikings! | 0 | - | 4.46 | 28,432 |
| The Portuguese Empire | 0 | - | 4.58 | 12,120 |
| Name the English Monarchs | 0 | - | 4.91 | 507,649 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,321 |
| French Inventions | 0 | - | 4.10 | 13,933 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,252 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,596 |
| History of Paris | 0 | - | 4.24 | 13,687 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,498 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,412 |
| Geography of the British Empire | 0 | - | 4.48 | 39,889 |
| Malta Country Quiz | 0 | - | 4.81 | 31,276 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,363 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,689 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,599 |
| The Only European Country ... | 0 | - | 4.91 | 219,757 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,920 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,342 |
| Name that Greek Letter | 0 | - | 4.93 | 325,403 |
| History of The Netherlands | 0 | - | 4.46 | 17,580 |
| History of Russia Quiz | 0 | - | 4.47 | 32,031 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,847 |
| The Trojan War | 0 | - | 4.83 | 40,120 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,350 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,728 |
| Roman Emperors | 0 | - | 4.95 | 121,516 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,262,441 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,724 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,850 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,591 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,425 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,948 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 313,335 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 176,756 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,433 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,955 |
| Slavic Countries | 0 | - | 4.96 | 112,566 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,773 |
| History of Germany | 0 | - | 4.39 | 53,010 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 128,097 |
| History of Spain | 0 | - | 4.23 | 21,178 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,836 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,259 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 363,023 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.75 | 12,368 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,610 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,706 |
| Ancient Greek Words | 0 | - | 4.93 | 112,734 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,977 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,515 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,995 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,863 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 99,251 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 97,030 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,796 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,962 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,720 |
| Monarchies of Europe | 0 | - | 4.90 | 99,085 |
| European Countries with One Border | 0 | - | 4.97 | 184,102 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,821 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 89,291 |
| Federal Subjects of Russia | 0 | - | 4.95 | 150,028 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,625 |
| France Country Quiz | 0 | - | 4.70 | 135,860 |
| Movies Set in France | 0 | - | 4.26 | 13,162 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,238 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,186 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,656 |
| American to British Word Translation | 0 | - | 4.14 | 139,870 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,098 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,358 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,508 |
| Champions League Winners | 0 | - | 4.92 | 1,018,593 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,134 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 128,033 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,492 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 279,455 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,392 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,618 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,193 |
| Russia Country Quiz | 0 | - | 4.83 | 115,507 |
| Countries That Border Russia | 0 | - | 4.98 | 465,078 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,866 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 35,671 |
| Andorra Country Quiz | 0 | - | 4.91 | 32,018 |
| France Cities Map Quiz | 0 | - | 4.96 | 168,045 |
| Kings of France Quiz | 0 | - | 4.22 | 32,975 |
| Germany Country Quiz | 0 | - | 4.82 | 159,146 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,302 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,368 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,485 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,284 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,795 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,656 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,652 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 187,087 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,124 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,288 |
| England or Wales? | 0 | - | 4.94 | 46,092 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,582 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,757 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,248 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,742 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 124,591 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,813 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,301 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,081 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,088 |
| Figures from Greek Mythology | 0 | - | 4.92 | 194,416 |
| Countries Italy Declared War On | 0 | - | 4.74 | 49,787 |
| Canary Islands | 0 | - | 4.62 | 17,551 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,186 |
| British Spellings | 0 | - | 4.06 | 99,641 |
| British Groups of Things | 0 | - | 4.26 | 83,050 |
| British Acronyms | 0 | - | 4.40 | 45,993 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,135 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,891 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,237 |
| Geography of Scotland | 0 | - | 4.63 | 21,841 |
| Medieval English History | 0 | - | 4.53 | 43,700 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,008 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,087 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,420 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,852 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 66,090 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,330 |
| Countries that Border Poland | 0 | - | 4.99 | 173,401 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,376 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,449 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,130 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,102 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,082 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,251 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,080 |
| 20 Questions About France | 0 | - | 4.11 | 32,488 |
| Countries that Beat France | 0 | - | 4.48 | 76,530 |
| France True or False? | 0 | - | 4.44 | 40,120 |
| Embarrassing Chapters in French History | 0 | - | 3.65 | 20,176 |
| Geography of Germany | 0 | - | 4.36 | 17,449 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 99,283 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,539 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,908 |
| Counties of Ireland | 0 | - | 4.92 | 197,780 |
| Italian Inventions | 0 | - | 3.81 | 18,485 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,400 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,780 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,416 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,282 |
| Roman Names for Places | 0 | - | 4.62 | 58,812 |
| Byzantine History | 0 | - | 4.91 | 29,064 |
| Byzantine Emperors | 0 | - | 4.93 | 14,672 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,339 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,465 |
| British to American Word Translation | 0 | - | 3.74 | 255,410 |
| British Foods by Description | 0 | - | 3.94 | 48,418 |
| British and American Word Differences | 0 | - | 2.63 | 46,940 |
| English Inventions #1 | 0 | - | 3.15 | 23,608 |
| English Inventions #2 | 0 | - | 3.95 | 8,732 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,263 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,739 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 32,010 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,045 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,364 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,115 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,411 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,458 |
