| Countries Invaded by the USSR | 0 | - | 4.29 | 92,228 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.43 | 26,167 |
| English Monarchs Quiz | 0 | - | 4.92 | 484,621 |
| Monarchies of Europe | 0 | - | 4.89 | 95,047 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 145,573 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 72,629 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.94 | 60,180 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 67,607 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 53,972 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 71,464 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 189,642 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 123,915 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 193,548 |
| Biggest Trading Partners - Russia | 0 | - | 4.54 | 35,814 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 112,781 |
| Communist Countries in History | 0 | - | 4.64 | 483,908 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,545,724 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 185,861 |
| Europe Map Quiz | 0 | - | 5.00 | 4,642,508 |
| European Secessionist Movements on a Map | 0 | - | 4.52 | 34,047 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 145,759 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 70,658 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 86,019 |
| Countries With the Most Russian Speakers | 0 | - | 4.95 | 73,832 |
| Prime Ministers of the UK | 0 | - | 4.96 | 423,319 |
| Canadian Prime Ministers Quiz | 0 | - | 4.63 | 55,549 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 161,923 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 223,310 |
| Countries in World War I | 0 | - | 4.88 | 222,820 |
| U.S. Presidents by Picture | 0 | - | 4.86 | 416,733 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 356,682 |
| Russia A-Z | 0 | - | 4.46 | 26,861 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 105,847 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 187,328 |
| Houses of British Monarchs | 0 | - | 4.52 | 64,301 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.89 | 50,708 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 374,163 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 184,861 |
| Play-Doh Presidents | 0 | - | 5.00 | 80,273 |
| Countries That Use the Euro | 0 | - | 4.97 | 96,684 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,165,262 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,294,936 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 108,790 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 188,688 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 147,580 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.95 | 209,465 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 84,683 |
| The Only European Country ... | 0 | - | 4.92 | 204,964 |
| European Countries NOT in NATO | 0 | - | 4.88 | 54,914 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.94 | 63,434 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 85,456 |
| Eastern Europe Map Quiz | 0 | - | 4.90 | 124,088 |
| Slavic Countries | 0 | - | 4.96 | 108,702 |
| Counties of England | 0 | - | 4.97 | 769,370 |
| Invasions of Great Britain | 0 | - | 4.51 | 58,636 |
| British History A-Z #1 | 0 | - | 4.42 | 42,971 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,356 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 234,834 |
| European Diaspora - Top 11 Countries | 0 | - | 4.89 | 92,530 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 132,919 |
| Three Band Flags of Europe | 0 | - | 4.97 | 187,100 |
| Catholic Countries in Europe | 0 | - | 4.83 | 91,910 |
| Pixelated Europe Map | 0 | - | 4.88 | 118,725 |
| European Countries with One Border | 0 | - | 4.97 | 178,223 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 174,663 |
| Countries That Border Russia | 0 | - | 4.98 | 451,782 |
| Countries Formerly in Yugoslavia | 0 | - | 4.96 | 121,945 |
| Regions of France Map Quiz | 0 | - | 4.96 | 139,557 |
| Countries Bordering France | 0 | - | 4.87 | 380,377 |
| States of Germany Map Quiz | 0 | - | 4.91 | 128,786 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 25,831 |
| Countries Bordering Germany | 0 | - | 4.99 | 360,809 |
| UK Cities Map Quiz | 0 | - | 4.95 | 456,347 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 91,068 |
| Counties of England Map Quiz | 0 | - | 4.97 | 301,772 |
| Wives of King Henry VIII | 0 | - | 4.55 | 52,741 |
| English Royal Consorts | 0 | - | 4.37 | 36,632 |
| Countries the UK Declared War On | 0 | - | 4.61 | 120,010 |
| Geography of the British Empire | 0 | - | 4.51 | 38,938 |
| The Reign of Queen Elizabeth I | 0 | - | 4.52 | 31,136 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 27,913 |
| Name the Popes Quiz | 0 | - | 4.47 | 134,434 |
| Countries of the Popes | 0 | - | 4.80 | 124,828 |
| Monarchies of Asia | 0 | - | 4.97 | 69,353 |
| Asian Country Superlatives | 0 | - | 4.83 | 79,212 |
| Countries in World War II | 0 | - | 4.52 | 882,562 |
| Political Movements by Country | 0 | - | 4.44 | 71,420 |
| Battle to Country | 0 | - | 4.91 | 50,388 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 103,052 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 73,923 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 117,761 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 88,487 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 74,745 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 89,003 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,038 |
| All U.S. Supreme Court Justices | 0 | - | 4.52 | 28,493 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.45 | 11,355 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 69,985 |
| Most Guessed European Capitals | 0 | - | 4.89 | 100,236 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 136,491 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 223,997 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 159,909 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 245,841 |
| Name a Valid European Country #2 | 0 | - | 4.93 | 95,091 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 79,343 |
| Countries that Border Poland | 0 | - | 4.99 | 168,414 |
| Russia Country Quiz | 0 | - | 4.84 | 111,425 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 81,025 |
| Arms Exports - Russia | 0 | - | 4.45 | 24,475 |
| Countries that Border Hungary | 0 | - | 4.98 | 102,271 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 34,203 |
| Countries Bordering Serbia | 0 | - | 4.96 | 89,806 |
| Countries Bordering Austria | 0 | - | 4.97 | 115,887 |
| France Cities Map Quiz | 0 | - | 4.96 | 161,574 |
| Countries that Visit France the Most | 0 | - | 4.84 | 43,915 |
| Countries Closest to Metropolitan France | 0 | - | 4.88 | 70,562 |
| Germany Country Quiz | 0 | - | 4.82 | 153,148 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 122,483 |
| States of the German Confederation in 1848 | 0 | - | 4.88 | 30,285 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 86,850 |
| Italy Country Quiz | 0 | - | 4.81 | 119,282 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 145,132 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 148,177 |
| Countries Bordering Italy | 0 | - | 4.94 | 99,022 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,335 |
| Countries Closest to Italy | 0 | - | 4.97 | 192,637 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 94,152 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 180,980 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 111,997 |
| Geography of the Spanish Empire | 0 | - | 4.48 | 36,622 |
| Countries Closest to Spain | 0 | - | 4.96 | 220,894 |
| UK Immigration by Country | 0 | - | 4.93 | 136,602 |
| United Kingdom Country Quiz | 0 | - | 4.95 | 133,862 |
| Countries that Visit the UK the Most | 0 | - | 4.85 | 71,681 |
| Counties of the UK and Ireland | 0 | - | 4.97 | 123,571 |
| Medieval English History | 0 | - | 4.53 | 42,785 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,399 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,448 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,194 |
| World Capitals Closest to London | 0 | - | 4.89 | 99,257 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 93,919 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 121,209 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 110,928 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.90 | 104,873 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.95 | 92,583 |
| National Founders | 0 | - | 4.39 | 83,143 |
| Important Cities in WWII | 0 | - | 4.42 | 90,689 |
| Countries with the Most Hindus | 0 | - | 4.90 | 120,553 |
| Hindu Countries | 0 | - | 4.85 | 47,922 |
| U.S. States by Governor Quiz | 0 | - | 4.42 | 17,733 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,260 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,144 |
| U.S. Presidential Trivia #1 | 0 | - | 4.47 | 105,723 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.57 | 90,945 |
| U.S. Presidential Trivia #2 | 0 | - | 4.48 | 51,022 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 90,805 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 37,141 |
| The American Civil War | 0 | - | 4.61 | 51,411 |
| Top 10 Coldest U.S. States | 0 | - | 4.93 | 120,745 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 121,395 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.81 | 60,515 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.70 | 11,682 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.70 | 57,183 |
| Random European Flag to Country | 0 | - | 4.89 | 176,450 |
| Russia by Picture | 0 | - | 4.39 | 19,832 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 69,055 |
| Countries that Beat Russia | 0 | - | 4.84 | 79,577 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.85 | 94,439 |
| Moldova Country Quiz | 0 | - | 4.81 | 29,822 |
| Andorra Country Quiz | 0 | - | 4.89 | 30,614 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 99,545 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,023 |
| Germany A-Z | 0 | - | 4.56 | 61,297 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 69,183 |
| Countries that Beat Germany | 0 | - | 4.95 | 102,587 |
| Olympian Gods Quiz | 0 | - | 4.96 | 476,696 |
| The Trojan War | 0 | - | 4.81 | 38,539 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 625,469 |
| Name that Greek Letter | 0 | - | 4.93 | 315,538 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.83 | 106,505 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 119,011 |
| Italy A-Z | 0 | - | 4.48 | 47,414 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.64 | 22,940 |
| Countries that Beat Italy | 0 | - | 4.85 | 52,374 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 82,543 |
| Roman Emperors | 0 | - | 4.96 | 112,464 |
| Greenland Country Quiz | 0 | - | 4.83 | 35,330 |
| Countries Closest to Iceland | 0 | - | 4.88 | 70,709 |
| Countries that Beat Iceland | 0 | - | 4.81 | 41,178 |
| Countries that Beat Portugal | 0 | - | 4.86 | 56,955 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 52,936 |
| Countries that Beat Spain | 0 | - | 4.94 | 61,247 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 96,119 |
| Monty Python Quotes | 0 | - | 4.88 | 41,858 |
| Ultimate Harry Potter Name Game | 0 | - | 4.95 | 481,931 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,395 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,270 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.77 | 19,859 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 59,250 |
| British History Quiz for Dummies | 0 | - | 4.70 | 76,636 |
