| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,430 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,769 |
| States of Germany | 0 | - | 4.95 | 154,416 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,673 |
| Counties of England | 0 | - | 4.97 | 802,689 |
| History of Italy | 0 | - | 4.55 | 32,142 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,816 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,419 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,091 |
| Europe Map Quiz | 0 | - | 5.00 | 4,787,135 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,334 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,315 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,727 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,814 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,547 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,608 |
| Regions of Italy | 0 | - | 4.92 | 77,027 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,785 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,290 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,742 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,508 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,838 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,742 |
| Germany Country Quiz | 0 | - | 4.82 | 158,806 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,783 |
| History of Germany | 0 | - | 4.39 | 52,970 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,792 |
| History of Austria | 0 | - | 4.70 | 17,971 |
| Geography of the French Empire | 0 | - | 4.45 | 27,215 |
| The French Revolution | 0 | - | 4.47 | 24,145 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,302 |
| The Vikings! | 0 | - | 4.46 | 28,403 |
| The Portuguese Empire | 0 | - | 4.58 | 12,104 |
| Name the English Monarchs | 0 | - | 4.91 | 506,254 |
| History of France | 0 | - | 4.61 | 57,592 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,569 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,854 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,456 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,229 |
| Geography of the British Empire | 0 | - | 4.48 | 39,844 |
| Malta Country Quiz | 0 | - | 4.81 | 31,229 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,733 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,181 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,064 |
| The Only European Country ... | 0 | - | 4.91 | 218,922 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,471 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,727 |
| Name that Greek Letter | 0 | - | 4.93 | 324,928 |
| History of The Netherlands | 0 | - | 4.46 | 17,549 |
| History of Russia Quiz | 0 | - | 4.47 | 32,001 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,285 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,544 |
| The Trojan War | 0 | - | 4.83 | 39,978 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,910 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,576 |
| Roman Emperors | 0 | - | 4.95 | 121,161 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,333 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,257,490 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,335,420 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,482 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,024 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,689 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,750 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,667 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 175,649 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,153 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,764 |
| Slavic Countries | 0 | - | 4.96 | 112,346 |
| French History Multiple Choice | 0 | - | 4.55 | 33,223 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,684 |
| Geography of Germany | 0 | - | 4.35 | 17,279 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,492 |
| History of Spain | 0 | - | 4.23 | 21,164 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,827 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,240 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 361,489 |
| Regions of France | 0 | - | 4.70 | 122,053 |
| France Immigration by Country | 0 | - | 4.70 | 76,921 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,454 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,642 |
| Ancient Greek Words | 0 | - | 4.93 | 112,432 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,742 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,404 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,796 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,811 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,799 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 96,456 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,462 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,539 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,455 |
| Monarchies of Europe | 0 | - | 4.90 | 98,846 |
| European Countries with One Border | 0 | - | 4.97 | 183,759 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,496 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,666 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,420 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,454 |
| French Inventions | 0 | - | 4.10 | 13,927 |
| History of Paris | 0 | - | 4.24 | 13,682 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,160 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,494 |
| American to British Word Translation | 0 | - | 4.14 | 139,673 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,052 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,996 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,446 |
| Champions League Winners | 0 | - | 4.92 | 1,015,813 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,857 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,767 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,766 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 278,850 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,861 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,525 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,854 |
| Russia Country Quiz | 0 | - | 4.83 | 115,291 |
| Countries That Border Russia | 0 | - | 4.98 | 464,437 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,726 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,576 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,926 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,770 |
| Departments of France | 0 | - | 4.93 | 55,122 |
| Countries Bordering France | 0 | - | 4.83 | 404,841 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,054 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,603 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,200 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,021 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,732 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,690 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,465 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,837 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,710 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,263 |
| England or Wales? | 0 | - | 4.94 | 45,959 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,069 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,495 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,406 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,719 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 121,527 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,666 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,984 |
| German History A-Z | 0 | - | 4.49 | 24,910 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,228 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,039 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,960 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,780 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,640 |
| Canary Islands | 0 | - | 4.62 | 17,525 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,064 |
| British Spellings | 0 | - | 4.06 | 99,596 |
| British Groups of Things | 0 | - | 4.26 | 83,007 |
| British Acronyms | 0 | - | 4.40 | 45,933 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,101 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,700 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,101 |
| Geography of Scotland | 0 | - | 4.63 | 21,737 |
| Medieval English History | 0 | - | 4.53 | 43,652 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,724,933 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,749 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,342 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,713 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,926 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,041 |
| Countries that Border Poland | 0 | - | 4.99 | 173,145 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,243 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,780 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,996 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,035 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,022 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,066 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,076 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,926 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,140 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,462 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.40 | 82,778 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,280 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,838 |
| Counties of Ireland | 0 | - | 4.92 | 197,250 |
| Italian Inventions | 0 | - | 3.81 | 18,473 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,242 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,347 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,277 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,200 |
| Roman Names for Places | 0 | - | 4.62 | 58,694 |
| Byzantine History | 0 | - | 4.91 | 29,019 |
| Byzantine Emperors | 0 | - | 4.93 | 14,585 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,310 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,085 |
| British to American Word Translation | 0 | - | 3.74 | 255,337 |
| British Foods by Description | 0 | - | 3.94 | 48,388 |
| British and American Word Differences | 0 | - | 2.63 | 46,926 |
| English Inventions #1 | 0 | - | 3.15 | 23,600 |
| English Inventions #2 | 0 | - | 3.95 | 8,725 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,216 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,332 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,957 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,942 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,313 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,086 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,197 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,047 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,289 |
| Bridges of London | 0 | - | 4.17 | 10,143 |
