| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,485 |
| Regions of Italy | 0 | - | 4.92 | 77,159 |
| Counties of England | 0 | - | 4.97 | 803,486 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,634 |
| Roman Emperors | 0 | - | 4.95 | 121,311 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,833 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,441 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,115 |
| Europe Map Quiz | 0 | - | 5.00 | 4,790,335 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,453 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,717 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,891 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,927 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,646 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,725 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,885 |
| States of Germany | 0 | - | 4.95 | 154,693 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,737 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,843 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,435 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,817 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,569 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,847 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,774 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,023 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,299 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,754 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,109 |
| History of Austria | 0 | - | 4.70 | 17,982 |
| Geography of the French Empire | 0 | - | 4.45 | 27,222 |
| The French Revolution | 0 | - | 4.47 | 24,153 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,565 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,549 |
| The Vikings! | 0 | - | 4.46 | 28,415 |
| The Portuguese Empire | 0 | - | 4.58 | 12,114 |
| Name the English Monarchs | 0 | - | 4.91 | 506,918 |
| History of France | 0 | - | 4.61 | 57,665 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,296 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,168 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,492 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,034 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,478 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,309 |
| Geography of the British Empire | 0 | - | 4.48 | 39,855 |
| Malta Country Quiz | 0 | - | 4.81 | 31,245 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,989 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,381 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,304 |
| The Only European Country ... | 0 | - | 4.91 | 219,285 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,662 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,357 |
| Name that Greek Letter | 0 | - | 4.93 | 325,106 |
| Countries Italy Declared War On | 0 | - | 4.74 | 46,686 |
| History of The Netherlands | 0 | - | 4.46 | 17,562 |
| History of Russia Quiz | 0 | - | 4.47 | 32,010 |
| The Trojan War | 0 | - | 4.83 | 40,018 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,058 |
| Figures from Greek Mythology | 0 | - | 4.91 | 189,002 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,228 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.75 | 12,350 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,259,560 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,336,403 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,656 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,179 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,010 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,844 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,923 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 176,115 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,265 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,830 |
| Slavic Countries | 0 | - | 4.96 | 112,434 |
| French History Multiple Choice | 0 | - | 4.55 | 33,250 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,713 |
| History of Germany | 0 | - | 4.39 | 52,986 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,688 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,335 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,234 |
| Roman Names for Places | 0 | - | 4.62 | 58,742 |
| Byzantine History | 0 | - | 4.91 | 29,033 |
| Byzantine Emperors | 0 | - | 4.93 | 14,625 |
| History of Spain | 0 | - | 4.23 | 21,167 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,830 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,247 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 362,080 |
| Regions of France | 0 | - | 4.70 | 122,220 |
| France Immigration by Country | 0 | - | 4.70 | 76,965 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,531 |
| Ancient Greek Words | 0 | - | 4.93 | 112,563 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,831 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,420 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,876 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,829 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 99,044 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 96,899 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,622 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,699 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,535 |
| Monarchies of Europe | 0 | - | 4.90 | 98,943 |
| European Countries with One Border | 0 | - | 4.97 | 183,902 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,613 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,979 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,703 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,514 |
| French Inventions | 0 | - | 4.10 | 13,930 |
| History of Paris | 0 | - | 4.24 | 13,683 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,471 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,803 |
| Italy Country Quiz | 0 | - | 4.77 | 124,112 |
| Italian Inventions | 0 | - | 3.81 | 18,478 |
| Roman History Vocabulary | 0 | - | 4.41 | 57,732 |
| American to British Word Translation | 0 | - | 4.14 | 139,754 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,074 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,145 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,465 |
| Champions League Winners | 0 | - | 4.92 | 1,016,895 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,973 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,866 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,057 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 279,071 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,060 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,923 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,983 |
| Russia Country Quiz | 0 | - | 4.83 | 115,372 |
| Countries That Border Russia | 0 | - | 4.98 | 464,663 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,784 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 35,608 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,967 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,881 |
| Departments of France | 0 | - | 4.93 | 55,250 |
| Countries Bordering France | 0 | - | 4.83 | 405,091 |
| Germany Country Quiz | 0 | - | 4.82 | 158,928 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,140 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,006 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,117 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,270 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,543 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,942 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,897 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,279 |
| England or Wales? | 0 | - | 4.94 | 45,990 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,280 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,605 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,731 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,724 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 122,938 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,717 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,252 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,056 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,988 |
| Italian Foods | 0 | - | 4.30 | 73,317 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,188 |
| Canary Islands | 0 | - | 4.62 | 17,544 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,100 |
| British Spellings | 0 | - | 4.06 | 99,615 |
| British Groups of Things | 0 | - | 4.26 | 83,029 |
| British Acronyms | 0 | - | 4.40 | 45,952 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,118 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,779 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,167 |
| Geography of Scotland | 0 | - | 4.63 | 21,750 |
| Medieval English History | 0 | - | 4.53 | 43,670 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,728,052 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,866 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,378 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,767 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,989 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,163 |
| Countries that Border Poland | 0 | - | 4.99 | 173,240 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,312 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,021 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,041 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,066 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,044 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,137 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,108 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,978 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,180 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,519 |
| Geography of Germany | 0 | - | 4.35 | 17,294 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,840 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,369 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,869 |
| Roman to Greek God | 0 | - | 4.52 | 123,386 |
| Counties of Ireland | 0 | - | 4.92 | 197,442 |
| Italian History A-Z | 0 | - | 4.16 | 17,942 |
| Roman History by Picture | 0 | - | 4.46 | 26,601 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,323 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,231 |
| British to American Word Translation | 0 | - | 3.74 | 255,365 |
| British Foods by Description | 0 | - | 3.94 | 48,394 |
| British and American Word Differences | 0 | - | 2.63 | 46,935 |
| English Inventions #1 | 0 | - | 3.15 | 23,604 |
| English Inventions #2 | 0 | - | 3.95 | 8,728 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,232 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,500 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,988 |
| Houses of British Monarchs | 0 | - | 4.54 | 65,981 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,338 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,099 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,690 |
