| Prime Ministers of the UK | 0 | - | 4.96 | 435,099 |
| Hindu Countries | 0 | - | 4.86 | 49,643 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,716 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,127 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,323 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,659,765 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,011 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,353 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,588 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,431 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,500 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,725 |
| National Founders | 0 | - | 4.40 | 83,675 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,091 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,778 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,665 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,460 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,083 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,750 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,077 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,535 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,570 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,214 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,119 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,668 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,589 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,018 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,898 |
| Political Movements by Country | 0 | - | 4.46 | 72,295 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,021 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,755 |
| Countries Bordering India | 0 | - | 4.98 | 162,660 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,205 |
| Countries Closest to India | 0 | - | 4.97 | 102,257 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,929 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,224 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,434 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,768 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,893 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,564 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,674 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,399 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,190 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,252 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,427 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,176 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,084 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,017 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,598 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,477 |
| Name the English Monarchs | 0 | - | 4.92 | 498,535 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,271 |
| Countries of the Popes | 0 | - | 4.79 | 127,323 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,789 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,373 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,859 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,327 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,831 |
| Biggest Cities in India | 0 | - | 4.70 | 67,379 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,272 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,009 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,386 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,321 |
| The Trojan War | 0 | - | 4.83 | 39,470 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 642,676 |
| Name that Greek Letter | 0 | - | 4.94 | 321,877 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,718 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,116 |
| Roman Emperors | 0 | - | 4.95 | 118,620 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,297 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,243 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,785 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,537 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,099 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 54,011 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,006 |
| U.S. Vice Presidents | 0 | - | 4.41 | 135,148 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,041 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,623 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,077 |
| Presidential Middle Names | 0 | - | 4.41 | 59,759 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,808 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,900 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,767 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,195 |
| The American Revolution | 0 | - | 4.52 | 54,074 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,665 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,567 |
| History of Russia Quiz | 0 | - | 4.49 | 31,803 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,748 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,855 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,906 |
| Ancient Greek Words | 0 | - | 4.92 | 110,809 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,508 |
| History of Italy | 0 | - | 4.55 | 31,845 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,331 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,498 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,009 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,750 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,535 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,584 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,603 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,031 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,570 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,658 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,761 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,924 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,622 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,701 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,529 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,497 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 218,752 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,686 |
| Europe Map Quiz | 0 | - | 5.00 | 4,734,854 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,776 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,904 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,875 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,493 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,943 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,673 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,983 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,411 |
| Pope Facts | 0 | - | 4.39 | 31,071 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,284 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,942 |
| The Vietnam War | 0 | - | 4.43 | 35,323 |
| Communist Countries in History | 0 | - | 4.63 | 492,878 |
| History of India | 0 | - | 4.61 | 21,301 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,248 |
| Africa Map Quiz | 0 | - | 5.00 | 2,105,813 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,476 |
| History of South Africa | 0 | - | 4.60 | 17,615 |
| Oceania Map Quiz | 0 | - | 4.98 | 636,123 |
| Australian Capitals | 0 | - | 4.92 | 62,601 |
| History of Mexico | 0 | - | 4.58 | 15,238 |
| United States Map Quiz | 0 | - | 4.98 | 4,143,621 |
| American Political Words | 0 | - | 4.39 | 23,347 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,080 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,469 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,814 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,172 |
| First Ladies of the United States | 0 | - | 4.28 | 85,278 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,823 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,122 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,426 |
| U.S. President Scramble | 0 | - | 4.40 | 116,266 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,018 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,848 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,039 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,720 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,699 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,660 |
| Official European Union Languages | 0 | - | 4.97 | 237,111 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,947 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,556 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,465 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,605 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,301 |
| History of Austria | 0 | - | 4.70 | 17,768 |
| Geography of the French Empire | 0 | - | 4.45 | 26,951 |
| The French Revolution | 0 | - | 4.46 | 23,805 |
| History of France | 0 | - | 4.59 | 56,213 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,397 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,979 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,805 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,791 |
| Mythology A-Z | 0 | - | 4.31 | 37,027 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,196 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,768 |
| Byzantine History | 0 | - | 4.91 | 28,651 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,626 |
| History of The Netherlands | 0 | - | 4.46 | 17,330 |
| The Vikings! | 0 | - | 4.46 | 28,254 |
| The Portuguese Empire | 0 | - | 4.54 | 12,001 |
| Arthurian Legend | 0 | - | 4.33 | 25,055 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,217 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,901 |
| Geography of the British Empire | 0 | - | 4.48 | 39,511 |
| Medieval English History | 0 | - | 4.53 | 43,336 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,557 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,441,895 |
| Asia Map Quiz | 0 | - | 4.99 | 907,961 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,798 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,213 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,348 |
| History of Iran | 0 | - | 4.65 | 16,282 |
| The Iraq War | 0 | - | 4.47 | 15,565 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,041 |
| Vietnam War Countries | 0 | - | 4.83 | 93,691 |
| Chinese Inventions | 0 | - | 4.30 | 33,733 |
| History of China | 0 | - | 4.37 | 56,748 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,181 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,237 |
| Countries by Founding Story | 0 | - | 4.95 | 76,613 |
| Independence from Whom | 0 | - | 4.99 | 209,886 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,892 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,054 |
| India A-Z | 0 | - | 4.42 | 33,944 |
| Countries that Beat India | 0 | - | 4.41 | 62,621 |
| Countries of Africa | 0 | - | 5.00 | 2,511,147 |
