| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,950 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,832 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,207 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,213 |
| Counties of England | 0 | - | 4.97 | 795,928 |
| History of Italy | 0 | - | 4.55 | 31,960 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,643 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,838 |
| Europe Map Quiz | 0 | - | 5.00 | 4,759,737 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,089 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 80,676 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,520 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,877 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,774 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,293 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,703 |
| States of Germany | 0 | - | 4.96 | 152,306 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,974 |
| Regions of Italy | 0 | - | 4.92 | 75,767 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,066 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,122 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,940 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,685 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,458 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,552 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,915 |
| History of Austria | 0 | - | 4.70 | 17,854 |
| Geography of the French Empire | 0 | - | 4.45 | 27,046 |
| The French Revolution | 0 | - | 4.46 | 23,924 |
| The Vikings! | 0 | - | 4.46 | 28,337 |
| The Portuguese Empire | 0 | - | 4.58 | 12,059 |
| Name the English Monarchs | 0 | - | 4.91 | 502,183 |
| History of France | 0 | - | 4.59 | 56,930 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,844 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,324 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,412 |
| Geography of the British Empire | 0 | - | 4.48 | 39,654 |
| Malta Country Quiz | 0 | - | 4.81 | 31,035 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,822 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,258 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,087 |
| The Only European Country ... | 0 | - | 4.91 | 216,375 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,982 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,859 |
| Name that Greek Letter | 0 | - | 4.93 | 323,305 |
| History of The Netherlands | 0 | - | 4.46 | 17,428 |
| Canary Islands | 0 | - | 4.62 | 17,473 |
| History of Russia Quiz | 0 | - | 4.47 | 31,905 |
| The Trojan War | 0 | - | 4.83 | 39,691 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,730 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,485 |
| Roman Emperors | 0 | - | 4.95 | 119,873 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,883 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,198 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,242,424 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,327,441 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,575 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,116 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,473 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,075 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,261 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 171,290 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,176 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,010 |
| Slavic Countries | 0 | - | 4.96 | 111,588 |
| French History Multiple Choice | 0 | - | 4.55 | 33,022 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,469 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,329 |
| History of Germany | 0 | - | 4.39 | 52,801 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,802 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,145 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,745 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,142 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 355,377 |
| Regions of France | 0 | - | 4.75 | 120,629 |
| France Immigration by Country | 0 | - | 4.70 | 76,470 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,960 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,426 |
| Ancient Greek Words | 0 | - | 4.93 | 111,502 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,307 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,200 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,250 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,174 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,611 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,766 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,409 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,155 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,661 |
| Monarchies of Europe | 0 | - | 4.90 | 98,059 |
| European Countries with One Border | 0 | - | 4.97 | 182,672 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,480 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 78,127 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,878 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,831 |
| French Inventions | 0 | - | 4.08 | 13,894 |
| History of Paris | 0 | - | 4.24 | 13,644 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,975 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,097 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,085 |
| Spain Country Quiz | 0 | - | 4.45 | 128,454 |
| American to British Word Translation | 0 | - | 4.14 | 138,930 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,881 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,391 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,306 |
| Champions League Winners | 0 | - | 4.92 | 1,005,702 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,770 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,042 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,909 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,005 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,620 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,946 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,617 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,554 |
| Russia Country Quiz | 0 | - | 4.85 | 114,401 |
| Countries That Border Russia | 0 | - | 4.98 | 461,495 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,302 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,324 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,664 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,628 |
| Departments of France | 0 | - | 4.93 | 54,006 |
| Countries Bordering France | 0 | - | 4.83 | 402,310 |
| Germany Country Quiz | 0 | - | 4.82 | 157,752 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,023 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,220 |
| Italy Country Quiz | 0 | - | 4.82 | 123,324 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,268 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,935 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,534 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,786 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,810 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,468 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,177 |
| England or Wales? | 0 | - | 4.94 | 45,651 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,168 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,233 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,650 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,803 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,221 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,969 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,901 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,755 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,296 |
| Countries Bordering Spain | 0 | - | 4.51 | 69,394 |
| Switzerland Immigration by Country | 0 | - | 4.68 | 29,664 |
| British Spellings | 0 | - | 4.06 | 99,434 |
| British Groups of Things | 0 | - | 4.25 | 82,858 |
| British Acronyms | 0 | - | 4.40 | 45,783 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,032 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,124 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,745 |
| Geography of Scotland | 0 | - | 4.63 | 21,609 |
| Medieval English History | 0 | - | 4.53 | 43,494 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,694,140 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,682 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,083 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,338 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,403 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,960 |
| Countries that Border Poland | 0 | - | 4.99 | 172,192 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,798 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,604 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,166 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,842 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,778 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,344 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,749 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,274 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,841 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,143 |
| Geography of Germany | 0 | - | 4.35 | 17,175 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,453 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,595 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,642 |
| Counties of Ireland | 0 | - | 4.92 | 195,037 |
| Italian Inventions | 0 | - | 3.81 | 18,437 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,830 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,922 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,723 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,892 |
| Roman Names for Places | 0 | - | 4.62 | 58,247 |
| Byzantine History | 0 | - | 4.91 | 28,814 |
| Byzantine Emperors | 0 | - | 4.94 | 13,409 |
| Spanish History A-Z | 0 | - | 4.37 | 19,284 |
| Real Madrid 2010s Starting XI | 0 | - | 4.89 | 67,311 |
| British to American Word Translation | 0 | - | 3.74 | 255,047 |
| British Foods by Description | 0 | - | 3.94 | 48,325 |
| British and American Word Differences | 0 | - | 2.63 | 46,870 |
| English Inventions #1 | 0 | - | 3.15 | 23,563 |
| English Inventions #2 | 0 | - | 4.00 | 8,697 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,587 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,522 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,775 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,628 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,126 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,938 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,473 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,600 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,779 |
| Bridges of London | 0 | - | 4.17 | 10,099 |
| British Sport Trivia | 0 | - | 4.37 | 20,452 |
