| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,123 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,974 |
| States of Germany | 0 | - | 4.95 | 152,883 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,164 |
| Counties of England | 0 | - | 4.97 | 797,918 |
| History of Italy | 0 | - | 4.55 | 32,022 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,696 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,271 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,911 |
| Europe Map Quiz | 0 | - | 5.00 | 4,767,025 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,575 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 82,755 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,876 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,179 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,018 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,624 |
| Regions of Italy | 0 | - | 4.92 | 76,082 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,294 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,160 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,296 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,067 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,724 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,531 |
| Germany Country Quiz | 0 | - | 4.83 | 158,021 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,683 |
| History of Germany | 0 | - | 4.39 | 52,869 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,586 |
| History of Austria | 0 | - | 4.70 | 17,880 |
| Geography of the French Empire | 0 | - | 4.45 | 27,132 |
| The French Revolution | 0 | - | 4.47 | 24,031 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,444 |
| The Vikings! | 0 | - | 4.46 | 28,357 |
| The Portuguese Empire | 0 | - | 4.58 | 12,076 |
| Name the English Monarchs | 0 | - | 4.91 | 503,361 |
| History of France | 0 | - | 4.59 | 57,148 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,055 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,379 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,377 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,583 |
| Geography of the British Empire | 0 | - | 4.48 | 39,719 |
| Malta Country Quiz | 0 | - | 4.81 | 31,088 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,296 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,760 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,458 |
| The Only European Country ... | 0 | - | 4.91 | 217,029 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,364 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,188 |
| Name that Greek Letter | 0 | - | 4.93 | 323,996 |
| History of The Netherlands | 0 | - | 4.46 | 17,450 |
| History of Russia Quiz | 0 | - | 4.47 | 31,940 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,600 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,106 |
| The Trojan War | 0 | - | 4.83 | 39,767 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,025 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,597 |
| Roman Emperors | 0 | - | 4.95 | 120,227 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,241 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,246,330 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,329,772 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,787 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,313 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,029 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,262 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 310,885 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,375 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,426 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,302 |
| Slavic Countries | 0 | - | 4.96 | 111,776 |
| French History Multiple Choice | 0 | - | 4.55 | 33,089 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,395 |
| Geography of Germany | 0 | - | 4.35 | 17,197 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,246 |
| History of Spain | 0 | - | 4.23 | 21,106 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,770 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,172 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 357,112 |
| Regions of France | 0 | - | 4.72 | 121,002 |
| France Immigration by Country | 0 | - | 4.70 | 76,598 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,078 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,396 |
| Ancient Greek Words | 0 | - | 4.93 | 111,765 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,442 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,290 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,336 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,662 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,967 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,699 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,517 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,886 |
| Monarchies of Europe | 0 | - | 4.90 | 98,242 |
| European Countries with One Border | 0 | - | 4.97 | 182,954 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,730 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 78,743 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,648 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,982 |
| French Inventions | 0 | - | 4.08 | 13,900 |
| History of Paris | 0 | - | 4.24 | 13,655 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,118 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,212 |
| American to British Word Translation | 0 | - | 4.14 | 139,200 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,925 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,885 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,349 |
| Champions League Winners | 0 | - | 4.92 | 1,008,318 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,976 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,226 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,133 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,597 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,121 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,350 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,536 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,880 |
| Russia Country Quiz | 0 | - | 4.83 | 114,591 |
| Countries That Border Russia | 0 | - | 4.98 | 462,089 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,414 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,381 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,732 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,935 |
| Departments of France | 0 | - | 4.93 | 54,275 |
| Countries Bordering France | 0 | - | 4.83 | 402,866 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,480 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,340 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,526 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,181 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,565 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,560 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,020 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,813 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,801 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,200 |
| England or Wales? | 0 | - | 4.94 | 45,749 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,703 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,048 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,667 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 115,290 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,333 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,832 |
| German History A-Z | 0 | - | 4.49 | 24,637 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,038 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,935 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,810 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,254 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,372 |
| Canary Islands | 0 | - | 4.62 | 17,486 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 29,770 |
| British Spellings | 0 | - | 4.06 | 99,477 |
| British Groups of Things | 0 | - | 4.25 | 82,890 |
| British Acronyms | 0 | - | 4.40 | 45,819 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,046 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,312 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,881 |
| Geography of Scotland | 0 | - | 4.63 | 21,635 |
| Medieval English History | 0 | - | 4.53 | 43,553 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,703,812 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,936 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,148 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,449 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,546 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,212 |
| Countries that Border Poland | 0 | - | 4.99 | 172,395 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,912 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,217 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,306 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,903 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,854 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,506 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,812 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,378 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,912 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,230 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,611 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,769 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,689 |
| Counties of Ireland | 0 | - | 4.92 | 195,640 |
| Italian Inventions | 0 | - | 3.81 | 18,446 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,918 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,190 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,769 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,971 |
| Roman Names for Places | 0 | - | 4.62 | 58,353 |
| Byzantine History | 0 | - | 4.91 | 28,893 |
| Byzantine Emperors | 0 | - | 4.92 | 14,278 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,198 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,190 |
| British to American Word Translation | 0 | - | 3.74 | 255,124 |
| British Foods by Description | 0 | - | 3.94 | 48,333 |
| British and American Word Differences | 0 | - | 2.63 | 46,886 |
| English Inventions #1 | 0 | - | 3.15 | 23,570 |
| English Inventions #2 | 0 | - | 3.95 | 8,706 |
| British Geography Quiz #2 | 0 | - | 4.29 | 27,603 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,048 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,822 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,730 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,184 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,985 |
| Prime Ministers of the UK | 0 | - | 4.95 | 439,577 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,738 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,915 |
| Bridges of London | 0 | - | 4.17 | 10,116 |
| British Sport Trivia | 0 | - | 4.37 | 20,470 |
