| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,212 |
| Regions of Italy | 0 | - | 4.92 | 76,301 |
| Counties of England | 0 | - | 4.97 | 799,141 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,663 |
| Roman Emperors | 0 | - | 4.95 | 120,428 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,723 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,301 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,965 |
| Europe Map Quiz | 0 | - | 5.00 | 4,772,254 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,779 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,572 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,134 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,350 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,164 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,887 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,244 |
| States of Germany | 0 | - | 4.95 | 153,285 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,303 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,453 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,460 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,431 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,175 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,758 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,592 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,001 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,697 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,620 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,157 |
| History of Austria | 0 | - | 4.70 | 17,911 |
| Geography of the French Empire | 0 | - | 4.45 | 27,157 |
| The French Revolution | 0 | - | 4.47 | 24,069 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,289 |
| The Vikings! | 0 | - | 4.46 | 28,371 |
| The Portuguese Empire | 0 | - | 4.58 | 12,086 |
| Name the English Monarchs | 0 | - | 4.91 | 504,104 |
| History of France | 0 | - | 4.59 | 57,293 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,033 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,130 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,382 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,140 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,408 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,685 |
| Geography of the British Empire | 0 | - | 4.48 | 39,740 |
| Malta Country Quiz | 0 | - | 4.81 | 31,120 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,637 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,114 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,737 |
| The Only European Country ... | 0 | - | 4.91 | 217,478 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,627 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,043 |
| Name that Greek Letter | 0 | - | 4.93 | 324,214 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,429 |
| History of The Netherlands | 0 | - | 4.46 | 17,489 |
| History of Russia Quiz | 0 | - | 4.47 | 31,957 |
| The Trojan War | 0 | - | 4.83 | 39,807 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,281 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,788 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,666 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,275 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,249,072 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,331,027 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,957 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,465 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,457 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,374 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,440 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 173,318 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,597 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,438 |
| Slavic Countries | 0 | - | 4.96 | 111,912 |
| French History Multiple Choice | 0 | - | 4.55 | 33,132 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,509 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,486 |
| History of Germany | 0 | - | 4.39 | 52,906 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,553 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,796 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,997 |
| Roman Names for Places | 0 | - | 4.62 | 58,414 |
| Byzantine History | 0 | - | 4.91 | 28,920 |
| Byzantine Emperors | 0 | - | 4.92 | 14,379 |
| History of Spain | 0 | - | 4.23 | 21,119 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,786 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,187 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 358,333 |
| Regions of France | 0 | - | 4.72 | 121,281 |
| France Immigration by Country | 0 | - | 4.70 | 76,694 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,155 |
| Ancient Greek Words | 0 | - | 4.93 | 111,935 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,510 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,346 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,466 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,698 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 97,972 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,060 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,884 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,756 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,019 |
| Monarchies of Europe | 0 | - | 4.90 | 98,374 |
| European Countries with One Border | 0 | - | 4.97 | 183,154 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,931 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 87,022 |
| Federal Subjects of Russia | 0 | - | 4.95 | 148,073 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,126 |
| French Inventions | 0 | - | 4.10 | 13,910 |
| History of Paris | 0 | - | 4.24 | 13,662 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,658 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,572 |
| Italy Country Quiz | 0 | - | 4.77 | 123,624 |
| Italian Inventions | 0 | - | 3.81 | 18,462 |
| American to British Word Translation | 0 | - | 4.14 | 139,338 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,954 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,225 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,379 |
| Champions League Winners | 0 | - | 4.92 | 1,010,148 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,377 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,282 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,986 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,426 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,694 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,344 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,081 |
| Russia Country Quiz | 0 | - | 4.83 | 114,719 |
| Countries That Border Russia | 0 | - | 4.98 | 462,896 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,498 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,423 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,790 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,204 |
| Departments of France | 0 | - | 4.93 | 54,509 |
| Countries Bordering France | 0 | - | 4.83 | 403,636 |
| Germany Country Quiz | 0 | - | 4.83 | 158,205 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,667 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,764 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,640 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,206 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,133 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,262 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,031 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,214 |
| England or Wales? | 0 | - | 4.94 | 45,811 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,065 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,117 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,722 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,676 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,680 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,429 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,083 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,951 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,847 |
| Italian Foods | 0 | - | 4.30 | 72,956 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,123 |
| Canary Islands | 0 | - | 4.62 | 17,494 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,836 |
| British Spellings | 0 | - | 4.06 | 99,512 |
| British Groups of Things | 0 | - | 4.25 | 82,916 |
| British Acronyms | 0 | - | 4.40 | 45,856 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,059 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,406 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,964 |
| Geography of Scotland | 0 | - | 4.63 | 21,666 |
| Medieval English History | 0 | - | 4.53 | 43,577 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,709,463 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,229 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,195 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,530 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,656 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,402 |
| Countries that Border Poland | 0 | - | 4.99 | 172,642 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,998 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,581 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,447 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,931 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,891 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,683 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,865 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,676 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,973 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,288 |
| Geography of Germany | 0 | - | 4.35 | 17,211 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,426 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,916 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,720 |
| Roman to Greek God | 0 | - | 4.52 | 123,037 |
| Counties of Ireland | 0 | - | 4.92 | 196,112 |
| Italian History A-Z | 0 | - | 4.21 | 17,742 |
| Roman History Vocabulary | 0 | - | 4.40 | 57,655 |
| Roman History by Picture | 0 | - | 4.46 | 26,505 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,227 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,400 |
| British to American Word Translation | 0 | - | 3.74 | 255,178 |
| British Foods by Description | 0 | - | 3.94 | 48,346 |
| British and American Word Differences | 0 | - | 2.63 | 46,899 |
| English Inventions #1 | 0 | - | 3.15 | 23,573 |
| English Inventions #2 | 0 | - | 3.95 | 8,709 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,818 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,336 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,850 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,787 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,213 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,004 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,195 |
