| Prime Ministers of the UK | 0 | - | 4.96 | 436,152 |
| Hindu Countries | 0 | - | 4.86 | 49,761 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,764 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,234 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 118,209 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,668,997 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,019 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,530 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,607 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,566 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,622 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,809 |
| National Founders | 0 | - | 4.40 | 83,710 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,629 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,146 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,704 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,772 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,682 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,461 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,876 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,377 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,742 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,842 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,398 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,277 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,698 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,431 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,987 |
| Political Movements by Country | 0 | - | 4.46 | 72,353 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,210 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,890 |
| Countries Bordering India | 0 | - | 4.98 | 163,132 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,272 |
| Countries Closest to India | 0 | - | 4.97 | 102,409 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,087 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,421 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,663 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,820 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,937 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,626 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,688 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,631 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,263 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,611 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,857 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,340 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,346 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,107 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,700 |
| Name the English Monarchs | 0 | - | 4.92 | 499,504 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,467 |
| Countries of the Popes | 0 | - | 4.79 | 127,508 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,925 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,591 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,127 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,400 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,856 |
| Biggest Cities in India | 0 | - | 4.70 | 67,470 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,363 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,151 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,410 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,366 |
| The Trojan War | 0 | - | 4.83 | 39,531 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,869 |
| Name that Greek Letter | 0 | - | 4.93 | 322,295 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,004 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,218 |
| Roman Emperors | 0 | - | 4.95 | 119,015 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,432 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,323 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,891 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,716 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,239 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,137 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,085 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,183 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,802 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,235 |
| Presidential Middle Names | 0 | - | 4.41 | 59,861 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,914 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,081 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,825 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,243 |
| The American Revolution | 0 | - | 4.52 | 54,123 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,315 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,798 |
| History of Russia Quiz | 0 | - | 4.49 | 31,829 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,801 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,002 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,806 |
| Ancient Greek Words | 0 | - | 4.93 | 110,999 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,897 |
| History of Italy | 0 | - | 4.55 | 31,877 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,360 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,542 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,066 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,877 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,602 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,679 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,794 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,242 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,616 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,722 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,817 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,117 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,768 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,151 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,960 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,605 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,278 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,074 |
| Europe Map Quiz | 0 | - | 5.00 | 4,741,854 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,823 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 210,649 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,357 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,732 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,119 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,979 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,746 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,439 |
| Pope Facts | 0 | - | 4.39 | 31,115 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,965 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 169,162 |
| The Vietnam War | 0 | - | 4.43 | 35,369 |
| Communist Countries in History | 0 | - | 4.63 | 493,547 |
| History of India | 0 | - | 4.61 | 21,330 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,376 |
| Africa Map Quiz | 0 | - | 5.00 | 2,109,052 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,580 |
| History of South Africa | 0 | - | 4.60 | 17,632 |
| Oceania Map Quiz | 0 | - | 4.98 | 637,661 |
| Australian Capitals | 0 | - | 4.92 | 62,642 |
| History of Mexico | 0 | - | 4.58 | 15,251 |
| United States Map Quiz | 0 | - | 4.98 | 4,146,671 |
| American Political Words | 0 | - | 4.39 | 23,370 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,101 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,481 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,827 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,483 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,188 |
| First Ladies of the United States | 0 | - | 4.28 | 85,340 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,851 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,147 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,596 |
| U.S. President Scramble | 0 | - | 4.40 | 116,391 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,062 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,870 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,071 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,757 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,723 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,790 |
| Official European Union Languages | 0 | - | 4.97 | 237,466 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,201 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,148 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,528 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,729 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,413 |
| History of Austria | 0 | - | 4.70 | 17,786 |
| Geography of the French Empire | 0 | - | 4.45 | 26,980 |
| The French Revolution | 0 | - | 4.46 | 23,846 |
| History of France | 0 | - | 4.59 | 56,486 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,416 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,060 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,848 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,823 |
| Mythology A-Z | 0 | - | 4.31 | 37,079 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,604 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,856 |
| Byzantine History | 0 | - | 4.91 | 28,673 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,909 |
| History of The Netherlands | 0 | - | 4.46 | 17,351 |
| The Vikings! | 0 | - | 4.46 | 28,275 |
| The Portuguese Empire | 0 | - | 4.58 | 12,018 |
| Arthurian Legend | 0 | - | 4.33 | 25,067 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,252 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,025 |
| Geography of the British Empire | 0 | - | 4.48 | 39,559 |
| Medieval English History | 0 | - | 4.53 | 43,367 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,572 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,162 |
| Asia Map Quiz | 0 | - | 4.99 | 909,830 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,831 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,272 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,511 |
| History of Iran | 0 | - | 4.66 | 16,297 |
| The Iraq War | 0 | - | 4.47 | 15,583 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,064 |
| Vietnam War Countries | 0 | - | 4.83 | 93,826 |
| Chinese Inventions | 0 | - | 4.30 | 33,744 |
| History of China | 0 | - | 4.37 | 56,847 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,428 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,364 |
| Countries by Founding Story | 0 | - | 4.95 | 76,777 |
| Independence from Whom | 0 | - | 4.99 | 210,296 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,159 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,158 |
| India A-Z | 0 | - | 4.42 | 33,991 |
| Countries that Beat India | 0 | - | 4.41 | 62,699 |
| Countries of Africa | 0 | - | 5.00 | 2,517,331 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,586 |
