| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,372 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,111 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,401 |
| Counties of England | 0 | - | 4.97 | 801,699 |
| History of Italy | 0 | - | 4.55 | 32,117 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,791 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,054 |
| Europe Map Quiz | 0 | - | 5.00 | 4,782,294 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,154 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,908 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,571 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,688 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,442 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,428 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,632 |
| States of Germany | 0 | - | 4.95 | 154,137 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,585 |
| Regions of Italy | 0 | - | 4.92 | 76,789 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,690 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,641 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,416 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,816 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,708 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,676 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,394 |
| History of Austria | 0 | - | 4.70 | 17,962 |
| Geography of the French Empire | 0 | - | 4.45 | 27,201 |
| The French Revolution | 0 | - | 4.47 | 24,124 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,548 |
| The Vikings! | 0 | - | 4.46 | 28,397 |
| The Portuguese Empire | 0 | - | 4.58 | 12,096 |
| Name the English Monarchs | 0 | - | 4.91 | 505,658 |
| History of France | 0 | - | 4.61 | 57,506 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,887 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,442 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,149 |
| Geography of the British Empire | 0 | - | 4.48 | 39,825 |
| Malta Country Quiz | 0 | - | 4.81 | 31,211 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,428 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,870 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,826 |
| The Only European Country ... | 0 | - | 4.91 | 218,528 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,243 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,973 |
| Name that Greek Letter | 0 | - | 4.93 | 324,754 |
| History of The Netherlands | 0 | - | 4.46 | 17,531 |
| Canary Islands | 0 | - | 4.62 | 17,514 |
| History of Russia Quiz | 0 | - | 4.47 | 31,990 |
| The Trojan War | 0 | - | 4.83 | 39,944 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,752 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,513 |
| Roman Emperors | 0 | - | 4.95 | 120,976 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,255 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,313 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,254,733 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,334,168 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,344 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,888 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,366 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,650 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 312,319 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 175,176 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,998 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,674 |
| Slavic Countries | 0 | - | 4.96 | 112,231 |
| French History Multiple Choice | 0 | - | 4.55 | 33,194 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,641 |
| History of Germany | 0 | - | 4.39 | 52,957 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,233 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,290 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,812 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,231 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 360,496 |
| Regions of France | 0 | - | 4.70 | 121,847 |
| France Immigration by Country | 0 | - | 4.70 | 76,854 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,366 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,196 |
| Ancient Greek Words | 0 | - | 4.93 | 112,298 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,659 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,663 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,387 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,692 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,777 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 98,602 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,373 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,296 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,307 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,331 |
| Monarchies of Europe | 0 | - | 4.90 | 98,710 |
| European Countries with One Border | 0 | - | 4.97 | 183,560 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,326 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 88,352 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,098 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,367 |
| French Inventions | 0 | - | 4.10 | 13,919 |
| History of Paris | 0 | - | 4.24 | 13,671 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 75,054 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,153 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,440 |
| Spain Country Quiz | 0 | - | 4.44 | 129,104 |
| American to British Word Translation | 0 | - | 4.14 | 139,575 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,031 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,746 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,426 |
| Champions League Winners | 0 | - | 4.92 | 1,014,081 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,689 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,640 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,293 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 278,577 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,553 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 263,984 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,684 |
| Russia Country Quiz | 0 | - | 4.83 | 115,193 |
| Countries That Border Russia | 0 | - | 4.98 | 464,075 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,655 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,520 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,888 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,604 |
| Departments of France | 0 | - | 4.93 | 54,923 |
| Countries Bordering France | 0 | - | 4.83 | 404,511 |
| Germany Country Quiz | 0 | - | 4.82 | 158,648 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,952 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,474 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,079 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,910 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,714 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,256 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,366 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,539 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,251 |
| England or Wales? | 0 | - | 4.94 | 45,911 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 131,757 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,377 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,975 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,708 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 116,388 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,583 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,191 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,014 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,934 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,496 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,581 |
| Countries Bordering Spain | 0 | - | 4.51 | 69,644 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,995 |
| British Spellings | 0 | - | 4.06 | 99,574 |
| British Groups of Things | 0 | - | 4.25 | 82,981 |
| British Acronyms | 0 | - | 4.40 | 45,909 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,090 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,634 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,066 |
| Geography of Scotland | 0 | - | 4.63 | 21,713 |
| Medieval English History | 0 | - | 4.53 | 43,626 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,720,484 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,616 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,303 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,656 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,829 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,870 |
| Countries that Border Poland | 0 | - | 4.99 | 173,016 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,181 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,441 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,924 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,004 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,989 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,959 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,026 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,873 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,095 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,409 |
| Geography of Germany | 0 | - | 4.35 | 17,253 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,253 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,195 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,802 |
| Counties of Ireland | 0 | - | 4.92 | 196,928 |
| Italian Inventions | 0 | - | 3.81 | 18,468 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,188 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,156 |
| Ancient Roman Trivia #2 | 0 | - | 4.60 | 44,178 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,170 |
| Roman Names for Places | 0 | - | 4.62 | 58,636 |
| Byzantine History | 0 | - | 4.91 | 28,998 |
| Byzantine Emperors | 0 | - | 4.93 | 14,527 |
| Spanish History A-Z | 0 | - | 4.37 | 19,482 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 68,621 |
| British to American Word Translation | 0 | - | 3.74 | 255,286 |
| British Foods by Description | 0 | - | 3.94 | 48,372 |
| British and American Word Differences | 0 | - | 2.63 | 46,919 |
| English Inventions #1 | 0 | - | 3.15 | 23,589 |
| English Inventions #2 | 0 | - | 3.95 | 8,720 |
| British Geography Quiz #2 | 0 | - | 4.29 | 28,199 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,087 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,921 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,896 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,283 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,059 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,673 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,983 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,214 |
| Bridges of London | 0 | - | 4.17 | 10,138 |
| British Sport Trivia | 0 | - | 4.37 | 20,512 |
