| Name the English Monarchs | 0 | - | 4.91 | 501,339 |
| Monarchies of Europe | 0 | - | 4.90 | 97,927 |
| Russia Country Quiz | 0 | - | 4.85 | 114,250 |
| Countries That Border Russia | 0 | - | 4.98 | 461,025 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,142 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,439 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,865 |
| European Geography By Letter - B #2 | 0 | - | 4.85 | 77,891 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,855 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,098 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,253 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,683 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,576 |
| Federal Subjects of Russia | 0 | - | 4.95 | 146,277 |
| Monarchies of Asia | 0 | - | 4.97 | 70,962 |
| Europe Map Quiz | 0 | - | 5.00 | 4,754,657 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,735 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,563 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,850 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,757 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,382 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,516 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,612 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,479 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,422 |
| Countries that Border Poland | 0 | - | 4.99 | 172,027 |
| Russian History A-Z | 0 | - | 4.38 | 31,572 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,704 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,233 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,142 |
| Kings of France Quiz | 0 | - | 4.20 | 32,680 |
| The Trojan War | 0 | - | 4.83 | 39,639 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 645,951 |
| Name that Greek Letter | 0 | - | 4.93 | 323,044 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,506 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,401 |
| Roman Emperors | 0 | - | 4.95 | 119,632 |
| English Royal Consorts | 0 | - | 4.37 | 37,312 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,475 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,887 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,783 |
| The Only European Country ... | 0 | - | 4.91 | 215,918 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,723 |
| History of Russia Quiz | 0 | - | 4.49 | 31,878 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,475 |
| History of Italy | 0 | - | 4.55 | 31,933 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,608 |
| History of The Netherlands | 0 | - | 4.46 | 17,403 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,156 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,784 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,252 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,239,491 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,325,883 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,396 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,945 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,103 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,958 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 309,916 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 170,482 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,970 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,696 |
| Slavic Countries | 0 | - | 4.96 | 111,467 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,461 |
| Ancient Greek Words | 0 | - | 4.93 | 111,316 |
| Counties of England | 0 | - | 4.97 | 794,558 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,804 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 354,070 |
| European Geography By Letter - A | 0 | - | 4.51 | 144,787 |
| European Geography By Letter - B #1 | 0 | - | 4.68 | 112,568 |
| European Geography By Letter - C | 0 | - | 4.46 | 113,305 |
| European Geography By Letter - D | 0 | - | 4.50 | 108,040 |
| European Geography By Letter - L | 0 | - | 4.52 | 113,106 |
| European Geography By Letter - M | 0 | - | 4.67 | 130,102 |
| European Geography By Letter - P #1 | 0 | - | 4.80 | 97,200 |
| European Geography By Letter - N | 0 | - | 4.44 | 100,537 |
| European Geography By Letter - R | 0 | - | 4.42 | 93,228 |
| European Geography By Letter - V | 0 | - | 4.43 | 92,783 |
| European Geography By Letter - T | 0 | - | 4.41 | 82,109 |
| European Geography By Letter - S #1 | 0 | - | 4.63 | 100,346 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,913 |
| Most Mentioned Allies of Russia | 0 | - | 4.49 | 37,955 |
| Most Mentioned Enemies of Russia | 0 | - | 4.69 | 89,878 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,909 |
| Ancient Greece A-Z | 0 | - | 4.60 | 23,113 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,028 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,989 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,230 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,710 |
| British History A-Z #1 | 0 | - | 4.45 | 46,390 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,484 |
| Champions League Winners | 0 | - | 4.92 | 1,003,512 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,138 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,648 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,214 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,879 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,869 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,473 |
| European Countries with One Border | 0 | - | 4.97 | 182,478 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,285 |
| Category Elimination - European Geography #3 | 0 | - | 4.85 | 80,653 |
| Albania Country Quiz | 0 | - | 4.54 | 38,909 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,704 |
| Serbia Country Quiz | 0 | - | 4.44 | 34,965 |
| History of Austria | 0 | - | 4.70 | 17,831 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,098 |
| Geography of the French Empire | 0 | - | 4.45 | 27,019 |
| The French Revolution | 0 | - | 4.46 | 23,897 |
| Countries Bordering France | 0 | - | 4.83 | 401,804 |
| History of France | 0 | - | 4.59 | 56,808 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,519 |
| States of Germany | 0 | - | 4.96 | 151,806 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,460 |
| Germany Immigration by Country | 0 | - | 4.85 | 80,861 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,540 |
| Regions of Italy | 0 | - | 4.92 | 75,517 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 51,793 |
| The Vikings! | 0 | - | 4.46 | 28,318 |
| The Portuguese Empire | 0 | - | 4.58 | 12,045 |
| Regions of Spain Quiz | 0 | - | 4.90 | 113,601 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,978 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,523 |
| United Kingdom A-Z | 0 | - | 4.51 | 87,551 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,303 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,283 |
| Geography of the British Empire | 0 | - | 4.48 | 39,627 |
| The Reign of Queen Victoria | 0 | - | 4.33 | 23,416 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,656 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,391 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,763 |
| Battle to Country | 0 | - | 4.91 | 53,117 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,585 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,041 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,873 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,792 |
| European Geography By Letter - E | 0 | - | 4.23 | 113,214 |
| European Geography By Letter - F | 0 | - | 4.17 | 92,543 |
| European Geography By Letter - H | 0 | - | 4.30 | 95,723 |
| European Geography By Letter - G | 0 | - | 4.27 | 102,372 |
| European Geography By Letter - I | 0 | - | 4.10 | 95,216 |
| European Geography By Letter - K | 0 | - | 4.14 | 69,880 |
| European Geography By Letter - O | 0 | - | 4.28 | 62,486 |
| European Geography by Letter - W | 0 | - | 4.20 | 82,732 |
| European Geography By Letter - S #2 | 0 | - | 4.19 | 51,000 |
| European Geography A-Z | 0 | - | 4.29 | 49,183 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 276,237 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 259,827 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,300 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,223 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,281 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,403 |
| Departments of France | 0 | - | 4.93 | 53,731 |
| Germany Country Quiz | 0 | - | 4.82 | 157,536 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,848 |
| German History A-Z | 0 | - | 4.49 | 24,567 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,931 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,874 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,380 |
| Italy Country Quiz | 0 | - | 4.82 | 123,162 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,073 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,793 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,238 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,512 |
| Byzantine History | 0 | - | 4.91 | 28,750 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,643 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,338 |
| British Acronyms | 0 | - | 4.39 | 45,752 |
| British Monopoly Board | 0 | - | 4.52 | 41,137 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,190 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,652 |
| Medieval English History | 0 | - | 4.53 | 43,453 |
| England or Wales? | 0 | - | 4.94 | 45,590 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 129,690 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,804 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,647 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,330 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 83,321 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,687,181 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,182 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,031 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.80 | 41,640 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,268 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 114,326 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,333 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,738 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 64,145 |
| Poland Country Quiz | 0 | - | 4.22 | 63,153 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,079 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,791 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,729 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,704 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,610 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,171 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,780 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,081 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,036 |
| Countries that Beat Germany | 0 | - | 4.95 | 106,078 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,025 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,893 |
| History of Germany | 0 | - | 4.39 | 52,775 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,442 |
