| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,404 |
| Regions of Italy | 0 | - | 4.92 | 76,950 |
| History of Italy | 0 | - | 4.55 | 32,137 |
| Counties of England | 0 | - | 4.97 | 802,284 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,553 |
| Roman Emperors | 0 | - | 4.95 | 121,091 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,269 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,157 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,666 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,762 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,505 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,539 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,709 |
| States of Germany | 0 | - | 4.95 | 154,309 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,645 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,809 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,760 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,217 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,412 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,703 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,472 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,074 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,832 |
| Europe Map Quiz | 0 | - | 5.00 | 4,785,059 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,482 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,731 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,146 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,724 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,617 |
| History of Austria | 0 | - | 4.70 | 17,968 |
| Geography of the French Empire | 0 | - | 4.45 | 27,208 |
| The French Revolution | 0 | - | 4.47 | 24,135 |
| History of France | 0 | - | 4.61 | 57,560 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,554 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,536 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,484 |
| The Vikings! | 0 | - | 4.46 | 28,400 |
| The Portuguese Empire | 0 | - | 4.58 | 12,099 |
| Name the English Monarchs | 0 | - | 4.91 | 506,031 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,446 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,196 |
| Geography of the British Empire | 0 | - | 4.48 | 39,838 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,483 |
| Name that Greek Letter | 0 | - | 4.93 | 324,865 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,217 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,159 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,282 |
| Malta Country Quiz | 0 | - | 4.81 | 31,224 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,604 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,060 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,979 |
| The Only European Country ... | 0 | - | 4.91 | 218,758 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,398 |
| The Trojan War | 0 | - | 4.83 | 39,962 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,851 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,675 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,615 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,122 |
| History of The Netherlands | 0 | - | 4.46 | 17,543 |
| History of Russia Quiz | 0 | - | 4.47 | 31,997 |
| French History Multiple Choice | 0 | - | 4.55 | 33,210 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,381 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,245 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,192 |
| Roman Names for Places | 0 | - | 4.62 | 58,670 |
| Byzantine History | 0 | - | 4.91 | 29,011 |
| Byzantine Emperors | 0 | - | 4.93 | 14,558 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,323 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,256,459 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,334,984 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,419 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,971 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,559 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,718 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,531 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 175,463 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,095 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,719 |
| Slavic Countries | 0 | - | 4.96 | 112,301 |
| Regions of France | 0 | - | 4.70 | 121,948 |
| France Immigration by Country | 0 | - | 4.70 | 76,897 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,673 |
| History of Germany | 0 | - | 4.39 | 52,965 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,429 |
| Ancient Greek Words | 0 | - | 4.93 | 112,383 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,708 |
| History of Spain | 0 | - | 4.23 | 21,157 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,397 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,753 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,802 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,822 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,236 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 361,135 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,653 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,428 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,398 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,462 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,404 |
| Monarchies of Europe | 0 | - | 4.90 | 98,788 |
| European Countries with One Border | 0 | - | 4.97 | 183,687 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,438 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,457 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,308 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,422 |
| French Inventions | 0 | - | 4.10 | 13,923 |
| History of Paris | 0 | - | 4.24 | 13,680 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,201 |
| Italian Inventions | 0 | - | 3.81 | 18,470 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,924 |
| Champions League Winners | 0 | - | 4.92 | 1,015,206 |
| Countries That Border Russia | 0 | - | 4.98 | 464,316 |
| Countries Bordering France | 0 | - | 4.83 | 404,705 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,657 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,760 |
| Italy Country Quiz | 0 | - | 4.77 | 123,976 |
| Roman History Vocabulary | 0 | - | 4.41 | 57,709 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,255 |
| American to British Word Translation | 0 | - | 4.14 | 139,638 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,042 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,436 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,791 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,722 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,593 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 278,758 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,741 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,317 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,797 |
| Russia Country Quiz | 0 | - | 4.83 | 115,260 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,702 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,555 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,913 |
| France Cities Map Quiz | 0 | - | 4.95 | 167,706 |
| Departments of France | 0 | - | 4.93 | 55,047 |
| Germany Country Quiz | 0 | - | 4.82 | 158,752 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,011 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,210 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,030 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,947 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,967 |
| Italian Foods | 0 | - | 4.30 | 73,223 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,166 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,414 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,784 |
| Canary Islands | 0 | - | 4.62 | 17,520 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,027 |
| British Spellings | 0 | - | 4.06 | 99,590 |
| British Groups of Things | 0 | - | 4.26 | 82,995 |
| British Acronyms | 0 | - | 4.40 | 45,926 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,098 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,683 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,650 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,093 |
| Geography of Scotland | 0 | - | 4.63 | 21,726 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,259 |
| Medieval English History | 0 | - | 4.53 | 43,639 |
| England or Wales? | 0 | - | 4.94 | 45,939 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,953 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,445 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,723,286 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,697 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,246 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,322 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,715 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,689 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 120,336 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,887 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,984 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,642 |
| Countries that Border Poland | 0 | - | 4.99 | 173,091 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,224 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,631 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,971 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,026 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,012 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,019 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,055 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,902 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,123 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,445 |
| Geography of Germany | 0 | - | 4.35 | 17,264 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,454 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,245 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,823 |
| Roman to Greek God | 0 | - | 4.52 | 123,303 |
| Counties of Ireland | 0 | - | 4.92 | 197,163 |
| Italian History A-Z | 0 | - | 4.16 | 17,913 |
| Roman History by Picture | 0 | - | 4.46 | 26,573 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,302 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,016 |
| British to American Word Translation | 0 | - | 3.74 | 255,315 |
| British Foods by Description | 0 | - | 3.94 | 48,385 |
| British and American Word Differences | 0 | - | 2.63 | 46,925 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,209 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,247 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,942 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,921 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,296 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,071 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,006 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,027 |
