| English Monarchs Quiz | 0 | - | 4.90 | 470,403 |
| Monarchies of Europe | 0 | - | 4.89 | 92,113 |
| Russia Country Quiz | 0 | - | 4.84 | 108,411 |
| Countries That Border Russia | 0 | - | 4.98 | 441,711 |
| Countries With the Most Russian Speakers | 0 | - | 4.96 | 61,318 |
| Countries that Beat Russia | 0 | - | 4.83 | 75,310 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 140,950 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 68,787 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.94 | 55,863 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 64,199 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 50,930 |
| Federal Subjects of Russia | 0 | - | 4.93 | 126,778 |
| States of the German Confederation in 1848 | 0 | - | 4.85 | 28,864 |
| Monarchies of Asia | 0 | - | 4.96 | 67,513 |
| Europe Map Quiz | 0 | - | 5.00 | 4,502,835 |
| Houses of British Monarchs | 0 | - | 4.53 | 62,870 |
| Top 10 Coldest European Countries | 0 | - | 4.93 | 186,480 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 120,550 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.70 | 55,898 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 214,246 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 153,188 |
| Deadliest U.S. Wars | 0 | - | 4.84 | 165,127 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 405,410 |
| Countries that Border Poland | 0 | - | 4.99 | 164,646 |
| Russian History A-Z | 0 | - | 4.36 | 18,172 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 79,208 |
| Countries Bordering Serbia | 0 | - | 4.96 | 87,223 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 158,486 |
| The Trojan War | 0 | - | 4.81 | 37,395 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 609,411 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.86 | 100,997 |
| Ancient Roman Trivia #1 | 0 | - | 4.83 | 74,373 |
| Roman Emperors | 0 | - | 4.96 | 107,842 |
| English Royal Consorts | 0 | - | 4.31 | 35,837 |
| The Reign of Queen Elizabeth I | 0 | - | 4.51 | 30,612 |
| Countries That Use the Euro | 0 | - | 4.92 | 73,273 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 348,175 |
| 10 Easternmost Countries in Europe | 0 | - | 4.88 | 102,156 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.83 | 40,250 |
| The Only European Country ... | 0 | - | 4.92 | 194,142 |
| Name that Greek Letter | 0 | - | 4.94 | 308,437 |
| Geography of the Dutch Empire | 0 | - | 4.68 | 33,350 |
| History of The Netherlands | 0 | - | 4.44 | 16,424 |
| Countries of the Spanish Empire | 0 | - | 4.51 | 75,945 |
| Invasions of Great Britain | 0 | - | 4.50 | 57,421 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.92 | 49,102 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,115,742 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.93 | 1,252,789 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 184,411 |
| 10 Westernmost Countries in Europe | 0 | - | 4.95 | 144,078 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.95 | 199,899 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 81,829 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 296,366 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 140,472 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 80,951 |
| Eastern Europe Map Quiz | 0 | - | 4.90 | 120,329 |
| Slavic Countries | 0 | - | 4.96 | 105,134 |
| Olympian Gods Quiz | 0 | - | 4.96 | 469,009 |
| Ancient Greek Words | 0 | - | 4.92 | 104,101 |
| Counties of England | 0 | - | 4.97 | 737,980 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 34,683 |
| European Geography By Letter - A | 0 | - | 4.61 | 128,038 |
| European Geography By Letter - B #1 | 0 | - | 4.73 | 106,920 |
| European Geography By Letter - C | 0 | - | 4.46 | 108,224 |
| European Geography By Letter - D | 0 | - | 4.51 | 102,790 |
| European Geography By Letter - L | 0 | - | 4.51 | 108,154 |
| European Geography By Letter - M | 0 | - | 4.53 | 117,494 |
| European Geography By Letter - P | 0 | - | 4.79 | 92,841 |
| European Geography By Letter - N | 0 | - | 4.43 | 96,373 |
| European Geography By Letter - R | 0 | - | 4.41 | 89,767 |
| European Geography By Letter - V | 0 | - | 4.46 | 89,176 |
| European Geography By Letter - S #1 | 0 | - | 4.61 | 96,189 |
| European Secessionist Movements on a Map | 0 | - | 4.52 | 32,996 |
| European Geography By Letter - B #2 | 0 | - | 4.74 | 65,065 |
| Most Mentioned Allies of Russia | 0 | - | 4.48 | 36,150 |
| Most Mentioned Enemies of Russia | 0 | - | 4.70 | 86,184 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 90,464 |
| Kings of France Quiz | 0 | - | 4.15 | 31,383 |
| Ancient Greece A-Z | 0 | - | 4.61 | 21,868 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 414,846 |
| Two Letter Roman Numerals | 0 | - | 4.98 | 52,077 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 46,903 |
| The Reign of Henry VIII | 0 | - | 4.24 | 26,895 |
| British History A-Z | 0 | - | 4.42 | 41,555 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.29 | 23,869 |
| Champions League Winners | 0 | - | 4.92 | 934,565 |
| U.S. Citizenship Test Questions | 0 | - | 4.84 | 229,451 |
| European Diaspora - Top 11 Countries | 0 | - | 4.89 | 88,896 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 128,337 |
| Three Band Flags of Europe | 0 | - | 4.97 | 181,267 |
| Catholic Countries in Europe | 0 | - | 4.83 | 88,714 |
| Pixelated Europe Map | 0 | - | 4.88 | 114,832 |
| European Countries with One Border | 0 | - | 4.97 | 173,419 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 151,115 |
| Category Elimination - European Geography #3 | 0 | - | 4.83 | 72,333 |
| Albania Country Quiz | 0 | - | 4.52 | 36,343 |
| History of Russia Quiz | 0 | - | 4.47 | 30,916 |
| Countries Formerly in Yugoslavia | 0 | - | 4.96 | 118,638 |
| Serbia Country Quiz | 0 | - | 4.43 | 33,155 |
| History of Austria | 0 | - | 4.69 | 17,012 |
| Regions of France Map Quiz | 0 | - | 4.96 | 134,209 |
| Geography of the French Empire | 0 | - | 4.51 | 26,064 |
| The French Revolution | 0 | - | 4.45 | 22,662 |
| Countries Bordering France | 0 | - | 4.87 | 370,812 |
| History of France Quiz | 0 | - | 4.56 | 41,367 |
| States of Germany Map Quiz | 0 | - | 4.91 | 125,627 |
| States of Germany | 0 | - | 4.94 | 135,262 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 22,663 |
| Germany Immigration by Country | 0 | - | 4.86 | 74,531 |
| Countries Bordering Germany | 0 | - | 4.99 | 353,079 |
| Counties of Ireland | 0 | - | 4.88 | 172,916 |
| History of Ireland Quiz | 0 | - | 4.44 | 20,058 |
| Regions of Italy | 0 | - | 4.90 | 66,284 |
| History of Italy | 0 | - | 4.50 | 30,856 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 34,404 |
| The Vikings! | 0 | - | 4.45 | 27,679 |
| The Portuguese Empire | 0 | - | 4.54 | 11,634 |
| Regions of Spain Quiz | 0 | - | 4.89 | 102,876 |
| Cantons of Switzerland | 0 | - | 4.97 | 44,346 |
| Countries and Territories of the United Kingdom | 0 | - | 4.88 | 88,160 |
| United Kingdom A-Z | 0 | - | 4.53 | 83,807 |
| Wives of King Henry VIII | 0 | - | 4.54 | 52,266 |
| Countries the UK Declared War On | 0 | - | 4.56 | 116,827 |
| Geography of the British Empire | 0 | - | 4.51 | 38,196 |
| The Reign of Queen Victoria | 0 | - | 4.33 | 22,739 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 16,282 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.96 | 302,982 |
| Asian Geography By Letter - B | 0 | - | 4.84 | 63,618 |
| Battle to Country | 0 | - | 4.91 | 47,961 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 99,227 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 84,816 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 86,031 |
| U.S. Cabinet Departments | 0 | - | 4.85 | 69,925 |
| European Geography By Letter - E | 0 | - | 4.22 | 108,697 |
| European Geography By Letter - F | 0 | - | 4.16 | 88,370 |
| European Geography By Letter - H | 0 | - | 4.29 | 91,698 |
| European Geography By Letter - G | 0 | - | 4.25 | 97,935 |
| European Geography By Letter - I | 0 | - | 4.10 | 91,641 |
| European Geography By Letter - K | 0 | - | 4.14 | 66,496 |
| European Geography By Letter - O | 0 | - | 4.28 | 59,565 |
| European Geography by Letter - W | 0 | - | 4.22 | 80,350 |
| European Geography By Letter - T | 0 | - | 4.39 | 72,805 |
| European Geography By Letter - S #2 | 0 | - | 4.19 | 48,434 |
| European Geography A-Z | 0 | - | 4.31 | 47,179 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 260,381 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 201,485 |
| Name a Valid European Country #2 | 0 | - | 4.92 | 90,098 |
| Croatia Country Quiz | 0 | - | 4.81 | 40,181 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.84 | 32,916 |
| France Cities Map Quiz | 0 | - | 4.95 | 155,886 |
| Departments of France | 0 | - | 4.88 | 42,531 |
| Germany Country Quiz | 0 | - | 4.82 | 148,053 |
| Germany Cities Map Quiz | 0 | - | 4.83 | 111,691 |
| Ancient Greek Trivia | 0 | - | 4.55 | 64,962 |
| Figures from Greek Mythology | 0 | - | 4.92 | 174,685 |
| Italy Country Quiz | 0 | - | 4.83 | 115,593 |
| Regions of Italy Map Quiz | 0 | - | 4.95 | 140,750 |
| Italy Cities Map Quiz | 0 | - | 4.96 | 144,117 |
| Countries Italy Declared War On | 0 | - | 4.75 | 41,479 |
| Countries Surrounding Rome | 0 | - | 4.97 | 47,891 |
| Byzantine History | 0 | - | 4.87 | 27,337 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 90,720 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 176,609 |
| British Acronyms | 0 | - | 4.39 | 44,502 |
| British Monopoly Board | 0 | - | 4.51 | 40,146 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 107,989 |
| Medieval English History | 0 | - | 4.53 | 42,057 |
| England or Wales? | 0 | - | 4.94 | 42,605 |
| All UEFA Champions League Teams Ever | 0 | - | 4.83 | 118,002 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 119,520 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.89 | 100,164 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.95 | 88,371 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.89 | 72,734 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,388,579 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.80 | 11,167 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 68,530 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 132,866 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 100,337 |
| European Countries NOT in NATO | 0 | - | 4.75 | 38,456 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 60,384 |
| Category Elimination - European Countries #1 | 0 | - | 4.88 | 81,805 |
| Poland Country Quiz | 0 | - | 4.22 | 59,220 |
| Countries that Border Hungary | 0 | - | 4.98 | 99,996 |
| Moldova Country Quiz | 0 | - | 4.87 | 28,911 |
| French Geography Quiz #1 | 0 | - | 4.87 | 32,750 |
| Andorra Country Quiz | 0 | - | 4.88 | 29,570 |
| Countries Bordering Austria | 0 | - | 4.97 | 113,613 |
| Countries that Visit France the Most | 0 | - | 4.83 | 42,279 |
| Countries Closest to Metropolitan France | 0 | - | 4.88 | 68,959 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 42,814 |
| Countries that Beat Germany | 0 | - | 4.95 | 96,495 |
| Countries With the Most German Speakers | 0 | - | 4.85 | 57,495 |
| History of Germany | 0 | - | 4.38 | 51,155 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.57 | 60,904 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 40,048 |
| Italian History A-Z | 0 | - | 4.17 | 9,210 |
| Countries Bordering Italy | 0 | - | 4.94 | 97,305 |
| Countries that Beat Italy | 0 | - | 4.85 | 50,074 |
| Countries Closest to Italy | 0 | - | 4.97 | 187,635 |
| Ancient Roman Trivia #2 | 0 | - | 4.54 | 36,622 |
