| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,499 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,925 |
| States of Germany | 0 | - | 4.95 | 154,804 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,765 |
| Counties of England | 0 | - | 4.97 | 803,786 |
| History of Italy | 0 | - | 4.55 | 32,169 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,839 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,456 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,125 |
| Europe Map Quiz | 0 | - | 5.00 | 4,791,485 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,500 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,838 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,934 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,964 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,681 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,761 |
| Regions of Italy | 0 | - | 4.92 | 77,204 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,866 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,490 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,853 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,586 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,850 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,790 |
| Germany Country Quiz | 0 | - | 4.82 | 158,980 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,100 |
| History of Germany | 0 | - | 4.39 | 52,991 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,227 |
| History of Austria | 0 | - | 4.70 | 17,988 |
| Geography of the French Empire | 0 | - | 4.45 | 27,225 |
| The French Revolution | 0 | - | 4.47 | 24,158 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,522 |
| The Vikings! | 0 | - | 4.46 | 28,419 |
| The Portuguese Empire | 0 | - | 4.58 | 12,116 |
| Name the English Monarchs | 0 | - | 4.91 | 507,106 |
| History of France | 0 | - | 4.61 | 57,689 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,959 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,481 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,333 |
| Geography of the British Empire | 0 | - | 4.48 | 39,862 |
| Malta Country Quiz | 0 | - | 4.81 | 31,250 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,087 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,461 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,394 |
| The Only European Country ... | 0 | - | 4.91 | 219,403 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,743 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,598 |
| Name that Greek Letter | 0 | - | 4.93 | 325,166 |
| History of The Netherlands | 0 | - | 4.46 | 17,567 |
| History of Russia Quiz | 0 | - | 4.47 | 32,012 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,432 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,616 |
| The Trojan War | 0 | - | 4.83 | 40,031 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,103 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,652 |
| Roman Emperors | 0 | - | 4.95 | 121,355 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,260,296 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,336,725 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,714 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,478 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,114 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,869 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 313,016 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 176,282 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,312 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,874 |
| Slavic Countries | 0 | - | 4.96 | 112,467 |
| French History Multiple Choice | 0 | - | 4.55 | 33,260 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,727 |
| Geography of Germany | 0 | - | 4.35 | 17,307 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,759 |
| History of Spain | 0 | - | 4.23 | 21,171 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,833 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,248 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 362,306 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.75 | 12,354 |
| Regions of France | 0 | - | 4.70 | 122,276 |
| France Immigration by Country | 0 | - | 4.70 | 76,981 |
| Largest Islands of Greece | 0 | - | 4.59 | 48,545 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,180 |
| Ancient Greek Words | 0 | - | 4.93 | 112,601 |
| Provinces of the Netherlands | 0 | - | 4.80 | 41,879 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,425 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 103,908 |
| The UK for Americans - True or False | 0 | - | 4.43 | 58,832 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 99,069 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 96,940 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,662 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,745 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,570 |
| Monarchies of Europe | 0 | - | 4.90 | 98,988 |
| European Countries with One Border | 0 | - | 4.97 | 183,951 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,669 |
| European Geography By Letter - B #2 | 0 | - | 4.86 | 89,029 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,810 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,541 |
| French Inventions | 0 | - | 4.10 | 13,930 |
| History of Paris | 0 | - | 4.24 | 13,684 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,174 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,569 |
| American to British Word Translation | 0 | - | 4.14 | 139,780 |
| Languages of the United Kingdom | 0 | - | 4.14 | 41,082 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,202 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,476 |
| Champions League Winners | 0 | - | 4.92 | 1,017,308 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,009 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,901 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,159 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 279,200 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,127 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,108 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,038 |
| Russia Country Quiz | 0 | - | 4.83 | 115,395 |
| Countries That Border Russia | 0 | - | 4.98 | 464,747 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,807 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 35,617 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,977 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,923 |
| Departments of France | 0 | - | 4.93 | 55,317 |
| Countries Bordering France | 0 | - | 4.83 | 405,200 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,172 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,645 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,357 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,158 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,763 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,182 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,580 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,985 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,966 |
| Former Dominions of the British Empire | 0 | - | 4.27 | 24,279 |
| England or Wales? | 0 | - | 4.94 | 46,000 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,351 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,642 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,839 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,732 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 123,403 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,738 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 39,016 |
| German History A-Z | 0 | - | 4.49 | 24,931 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,266 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,063 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,998 |
| Figures from Greek Mythology | 0 | - | 4.91 | 189,089 |
| Countries Italy Declared War On | 0 | - | 4.74 | 47,603 |
| Canary Islands | 0 | - | 4.62 | 17,545 |
| Switzerland Immigration by Country | 0 | - | 4.69 | 30,123 |
| British Spellings | 0 | - | 4.06 | 99,621 |
| British Groups of Things | 0 | - | 4.26 | 83,034 |
| British Acronyms | 0 | - | 4.40 | 45,954 |
| United Kingdom Decoder | 0 | - | 4.29 | 40,123 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.63 | 25,822 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 32,183 |
| Geography of Scotland | 0 | - | 4.63 | 21,764 |
| Medieval English History | 0 | - | 4.53 | 43,675 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,729,327 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,920 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,387 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,791 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 66,014 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,206 |
| Countries that Border Poland | 0 | - | 4.99 | 173,286 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,326 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,115 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,060 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,082 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,048 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,166 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,130 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,005 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,198 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,538 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.40 | 82,812 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,395 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,880 |
| Counties of Ireland | 0 | - | 4.92 | 197,547 |
| Italian Inventions | 0 | - | 3.81 | 18,481 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,330 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,558 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,346 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,248 |
| Roman Names for Places | 0 | - | 4.62 | 58,760 |
| Byzantine History | 0 | - | 4.91 | 29,036 |
| Byzantine Emperors | 0 | - | 4.93 | 14,642 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,326 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,290 |
| British to American Word Translation | 0 | - | 3.74 | 255,382 |
| British Foods by Description | 0 | - | 3.94 | 48,399 |
| British and American Word Differences | 0 | - | 2.63 | 46,936 |
| English Inventions #1 | 0 | - | 3.15 | 23,606 |
| English Inventions #2 | 0 | - | 3.95 | 8,729 |
| British Geography Quiz #2 | 0 | - | 4.30 | 28,245 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,555 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,992 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,000 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,343 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,100 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,870 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,113 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,368 |
| Bridges of London | 0 | - | 4.17 | 10,149 |
| British Sport Trivia | 0 | - | 4.39 | 20,540 |
