| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,249 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,641 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,323 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,582 |
| Counties of England | 0 | - | 4.97 | 799,783 |
| History of Italy | 0 | - | 4.55 | 32,084 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,744 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,991 |
| Europe Map Quiz | 0 | - | 5.00 | 4,774,320 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,858 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,890 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,217 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,425 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,226 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,964 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,318 |
| States of Germany | 0 | - | 4.95 | 153,525 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,359 |
| Regions of Italy | 0 | - | 4.92 | 76,409 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,512 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,478 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,233 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,771 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,630 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,339 |
| History of Spain | 0 | - | 4.23 | 21,130 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,502 |
| History of Austria | 0 | - | 4.70 | 17,923 |
| Geography of the French Empire | 0 | - | 4.45 | 27,168 |
| The French Revolution | 0 | - | 4.47 | 24,077 |
| The Vikings! | 0 | - | 4.46 | 28,375 |
| The Portuguese Empire | 0 | - | 4.58 | 12,087 |
| Name the English Monarchs | 0 | - | 4.91 | 504,482 |
| History of France | 0 | - | 4.61 | 57,346 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,497 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,424 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,970 |
| Geography of the British Empire | 0 | - | 4.48 | 39,769 |
| Malta Country Quiz | 0 | - | 4.81 | 31,135 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,826 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,290 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,892 |
| The Only European Country ... | 0 | - | 4.91 | 217,711 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,790 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,592 |
| Name that Greek Letter | 0 | - | 4.93 | 324,326 |
| History of The Netherlands | 0 | - | 4.46 | 17,499 |
| Canary Islands | 0 | - | 4.62 | 17,499 |
| History of Russia Quiz | 0 | - | 4.47 | 31,970 |
| The Trojan War | 0 | - | 4.83 | 39,844 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,396 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,965 |
| Roman Emperors | 0 | - | 4.95 | 120,528 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,129 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,283 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,250,314 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,331,707 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,042 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,548 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,667 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,456 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,652 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 173,819 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,690 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,493 |
| Slavic Countries | 0 | - | 4.96 | 111,989 |
| French History Multiple Choice | 0 | - | 4.55 | 33,145 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,517 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,520 |
| History of Germany | 0 | - | 4.39 | 52,913 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,711 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,247 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,793 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,194 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 358,760 |
| Regions of France | 0 | - | 4.70 | 121,407 |
| France Immigration by Country | 0 | - | 4.70 | 76,717 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,193 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,234 |
| Ancient Greek Words | 0 | - | 4.93 | 112,036 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,541 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,473 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,365 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,507 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,715 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,216 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,126 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,963 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,857 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,079 |
| Monarchies of Europe | 0 | - | 4.90 | 98,441 |
| European Countries with One Border | 0 | - | 4.97 | 183,244 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,021 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 87,467 |
| Federal Subjects of Russia | 0 | - | 4.95 | 148,269 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,187 |
| French Inventions | 0 | - | 4.10 | 13,911 |
| History of Paris | 0 | - | 4.24 | 13,665 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,734 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,135 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,318 |
| Spain Country Quiz | 0 | - | 4.44 | 128,883 |
| American to British Word Translation | 0 | - | 4.14 | 139,397 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,970 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,348 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,391 |
| Champions League Winners | 0 | - | 4.92 | 1,010,837 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,423 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,347 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,510 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,676 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,953 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,754 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,237 |
| Russia Country Quiz | 0 | - | 4.83 | 114,781 |
| Countries That Border Russia | 0 | - | 4.98 | 463,074 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,529 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,443 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,813 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,287 |
| Departments of France | 0 | - | 4.93 | 54,604 |
| Countries Bordering France | 0 | - | 4.83 | 403,817 |
| Germany Country Quiz | 0 | - | 4.83 | 158,311 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,733 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,905 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,796 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,700 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,636 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,357 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,175 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,149 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,217 |
| England or Wales? | 0 | - | 4.94 | 45,827 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,213 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,164 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,921 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,678 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,821 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,465 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,114 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,968 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,866 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,944 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,461 |
| Countries Bordering Spain | 0 | - | 4.51 | 69,558 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,864 |
| British Spellings | 0 | - | 4.06 | 99,527 |
| British Groups of Things | 0 | - | 4.25 | 82,930 |
| British Acronyms | 0 | - | 4.40 | 45,869 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,063 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,450 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,993 |
| Geography of Scotland | 0 | - | 4.63 | 21,677 |
| Medieval English History | 0 | - | 4.53 | 43,591 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,686 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,356 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,223 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,556 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,685 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,520 |
| Countries that Border Poland | 0 | - | 4.99 | 172,696 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,022 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,760 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,484 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,948 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,915 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,731 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,906 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,717 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,992 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,311 |
| Geography of Germany | 0 | - | 4.35 | 17,216 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,594 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,994 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,741 |
| Counties of Ireland | 0 | - | 4.92 | 196,295 |
| Italian Inventions | 0 | - | 3.81 | 18,463 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,060 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,459 |
| Ancient Roman Trivia #2 | 0 | - | 4.59 | 41,608 |
| Geography of the Roman Empire | 0 | - | 4.56 | 52,048 |
| Roman Names for Places | 0 | - | 4.62 | 58,485 |
| Byzantine History | 0 | - | 4.91 | 28,940 |
| Byzantine Emperors | 0 | - | 4.92 | 14,412 |
| Spanish History A-Z | 0 | - | 4.37 | 19,330 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 68,217 |
| British to American Word Translation | 0 | - | 3.74 | 255,203 |
| British Foods by Description | 0 | - | 3.94 | 48,348 |
| British and American Word Differences | 0 | - | 2.63 | 46,906 |
| English Inventions #1 | 0 | - | 3.15 | 23,576 |
| English Inventions #2 | 0 | - | 3.95 | 8,710 |
| British Geography Quiz #2 | 0 | - | 4.29 | 28,070 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,477 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,865 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,816 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,232 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,018 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,602 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,851 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,060 |
