| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,436 |
| Regions of Italy | 0 | - | 4.92 | 77,036 |
| Counties of England | 0 | - | 4.97 | 802,719 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,580 |
| Roman Emperors | 0 | - | 4.95 | 121,172 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,816 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,420 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,092 |
| Europe Map Quiz | 0 | - | 5.00 | 4,787,373 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,340 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,334 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,736 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,817 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,550 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,621 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,779 |
| States of Germany | 0 | - | 4.95 | 154,428 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,676 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,788 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,296 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,748 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,513 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,840 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,743 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,671 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,203 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,732 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,809 |
| History of Austria | 0 | - | 4.70 | 17,971 |
| Geography of the French Empire | 0 | - | 4.45 | 27,216 |
| The French Revolution | 0 | - | 4.47 | 24,145 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,558 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,496 |
| The Vikings! | 0 | - | 4.46 | 28,403 |
| The Portuguese Empire | 0 | - | 4.58 | 12,104 |
| Name the English Monarchs | 0 | - | 4.91 | 506,287 |
| History of France | 0 | - | 4.61 | 57,593 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,245 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,160 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,361 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,715 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,459 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,236 |
| Geography of the British Empire | 0 | - | 4.48 | 39,844 |
| Malta Country Quiz | 0 | - | 4.81 | 31,231 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,746 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,193 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,074 |
| The Only European Country ... | 0 | - | 4.91 | 218,939 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,479 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,765 |
| Name that Greek Letter | 0 | - | 4.93 | 324,947 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,644 |
| History of The Netherlands | 0 | - | 4.46 | 17,550 |
| History of Russia Quiz | 0 | - | 4.47 | 32,002 |
| The Trojan War | 0 | - | 4.83 | 39,980 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,925 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,800 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,163 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,333 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,257,652 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,335,471 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,487 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,034 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,711 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,755 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,682 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 175,673 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,161 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,773 |
| Slavic Countries | 0 | - | 4.96 | 112,353 |
| French History Multiple Choice | 0 | - | 4.55 | 33,225 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,686 |
| History of Germany | 0 | - | 4.39 | 52,970 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,509 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,281 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,202 |
| Roman Names for Places | 0 | - | 4.62 | 58,697 |
| Byzantine History | 0 | - | 4.91 | 29,020 |
| Byzantine Emperors | 0 | - | 4.93 | 14,587 |
| 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 | 20,241 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 361,522 |
| Regions of France | 0 | - | 4.70 | 122,062 |
| France Immigration by Country | 0 | - | 4.70 | 76,923 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,459 |
| Ancient Greek Words | 0 | - | 4.93 | 112,438 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,744 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,404 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,799 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,812 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,833 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 96,480 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,468 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,546 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,458 |
| Monarchies of Europe | 0 | - | 4.90 | 98,853 |
| European Countries with One Border | 0 | - | 4.97 | 183,769 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,504 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,703 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,436 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,461 |
| French Inventions | 0 | - | 4.10 | 13,927 |
| History of Paris | 0 | - | 4.24 | 13,682 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,315 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,772 |
| Italy Country Quiz | 0 | - | 4.77 | 124,023 |
| Italian Inventions | 0 | - | 3.81 | 18,473 |
| Roman History Vocabulary | 0 | - | 4.41 | 57,717 |
| American to British Word Translation | 0 | - | 4.14 | 139,682 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,055 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,999 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,446 |
| Champions League Winners | 0 | - | 4.92 | 1,015,861 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,862 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,771 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,797 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 278,865 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,870 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,553 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,859 |
| Russia Country Quiz | 0 | - | 4.83 | 115,297 |
| Countries That Border Russia | 0 | - | 4.98 | 464,456 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,729 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,577 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,931 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,774 |
| Departments of France | 0 | - | 4.93 | 55,127 |
| Countries Bordering France | 0 | - | 4.83 | 404,848 |
| Germany Country Quiz | 0 | - | 4.82 | 158,813 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,055 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,794 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,027 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,258 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,465 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,848 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,717 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,265 |
| England or Wales? | 0 | - | 4.94 | 45,961 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,081 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,504 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,438 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,719 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 121,635 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,669 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,230 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,040 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,961 |
| Italian Foods | 0 | - | 4.30 | 73,256 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,174 |
| Canary Islands | 0 | - | 4.62 | 17,527 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,066 |
| British Spellings | 0 | - | 4.06 | 99,600 |
| British Groups of Things | 0 | - | 4.26 | 83,008 |
| British Acronyms | 0 | - | 4.40 | 45,935 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,105 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,705 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,102 |
| Geography of Scotland | 0 | - | 4.63 | 21,740 |
| Medieval English History | 0 | - | 4.53 | 43,654 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,725,144 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,758 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,347 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,718 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,929 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,055 |
| Countries that Border Poland | 0 | - | 4.99 | 173,152 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,245 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,800 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,998 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,038 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,023 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,072 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,079 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,934 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,143 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,462 |
| Geography of Germany | 0 | - | 4.35 | 17,281 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,584 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,289 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,839 |
| Roman to Greek God | 0 | - | 4.52 | 123,332 |
| Counties of Ireland | 0 | - | 4.92 | 197,276 |
| Italian History A-Z | 0 | - | 4.16 | 17,927 |
| Roman History by Picture | 0 | - | 4.46 | 26,582 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,311 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,096 |
| British to American Word Translation | 0 | - | 3.74 | 255,339 |
| British Foods by Description | 0 | - | 3.94 | 48,388 |
| British and American Word Differences | 0 | - | 2.63 | 46,928 |
| English Inventions #1 | 0 | - | 3.15 | 23,600 |
| English Inventions #2 | 0 | - | 3.95 | 8,725 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,217 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,343 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,959 |
| Houses of British Monarchs | 0 | - | 4.54 | 65,943 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,316 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,086 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,209 |
