| Prime Ministers of the UK | 0 | - | 4.95 | 442,954 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,217 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,980 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,142 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,765 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,640 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,729,749 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,806 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,726 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,907 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,080 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,643 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,262 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,569 |
| National Founders | 0 | - | 4.40 | 83,995 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,770 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,817 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,502 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,574 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,934 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,965 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,938 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,516 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,902 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,952 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,976 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,696 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,959 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,737 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,668 |
| Japan by Picture | 0 | - | 4.45 | 29,446 |
| Political Movements by Country | 0 | - | 4.46 | 72,811 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,172 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,155 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,142 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,872 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,931 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,801 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,375 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,918 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,390 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,223 |
| Countries Italy Declared War On | 0 | - | 4.74 | 47,795 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,974 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,988 |
| Name the English Monarchs | 0 | - | 4.91 | 507,185 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,061 |
| Countries of the Popes | 0 | - | 4.79 | 128,852 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,688 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,097 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,729 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,094 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,080 |
| Countries that Border China | 0 | - | 4.96 | 264,466 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,923 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,603 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,283 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,666 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,808 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,182 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,115 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,451 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,077 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,610 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,681 |
| The Trojan War | 0 | - | 4.83 | 40,037 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,675 |
| Name that Greek Letter | 0 | - | 4.93 | 325,186 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,125 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,665 |
| Roman Emperors | 0 | - | 4.95 | 121,374 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,617 |
| China by Picture | 0 | - | 4.51 | 63,813 |
| Countries that Beat China | 0 | - | 4.85 | 116,904 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,820 |
| Biggest Cities in Japan | 0 | - | 4.68 | 83,585 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,342 |
| Hindu Countries | 0 | - | 4.86 | 50,650 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,591 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,633 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,434 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,729 |
| Presidential Middle Names | 0 | - | 4.42 | 60,790 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,729 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,928 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,238 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,649 |
| The American Revolution | 0 | - | 4.52 | 54,379 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,905 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,505 |
| History of Russia Quiz | 0 | - | 4.47 | 32,017 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,201 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,093 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,242 |
| Ancient Greek Words | 0 | - | 4.93 | 112,614 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,789 |
| History of Italy | 0 | - | 4.55 | 32,175 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,588 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,841 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,462 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,907 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,020 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,134 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,061 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,137 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,082 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,317 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,164 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,511 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,207 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,657 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,813 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,360 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,641 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,663 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,747 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,199 |
| Europe Map Quiz | 0 | - | 5.00 | 4,792,001 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,225 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,272 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,598 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,669 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,668 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,544 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,245 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,841 |
| Pope Facts | 0 | - | 4.39 | 31,415 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 280,933 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,149 |
| The Vietnam War | 0 | - | 4.44 | 35,684 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,596 |
| Communist Countries in History | 0 | - | 4.63 | 498,629 |
| History of South Africa | 0 | - | 4.60 | 17,777 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,064 |
| Australian Capitals | 0 | - | 4.92 | 62,856 |
| History of Mexico | 0 | - | 4.52 | 15,372 |
| United States Map Quiz | 0 | - | 4.98 | 4,173,025 |
| American Political Words | 0 | - | 4.39 | 23,486 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,220 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,569 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,909 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,134 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,378 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,792 |
| First Ladies of the United States | 0 | - | 4.28 | 86,013 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,329 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,517 |
| U.S. President Scramble | 0 | - | 4.40 | 117,530 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,382 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,115 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,366 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 59,497 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,107 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,959 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,827 |
| Official European Union Languages | 0 | - | 4.97 | 240,146 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,778 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,275 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,967 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,481 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,217 |
| History of Austria | 0 | - | 4.70 | 17,990 |
| Geography of the French Empire | 0 | - | 4.45 | 27,228 |
| The French Revolution | 0 | - | 4.47 | 24,163 |
| History of France | 0 | - | 4.61 | 57,700 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,573 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,648 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,271 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,066 |
| Mythology A-Z | 0 | - | 4.31 | 37,433 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,000 |
| Figures from Greek Mythology | 0 | - | 4.91 | 189,126 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,533 |
| Byzantine History | 0 | - | 4.91 | 29,037 |
| Byzantine Emperors | 0 | - | 4.93 | 14,649 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,108 |
| History of The Netherlands | 0 | - | 4.46 | 17,570 |
| The Vikings! | 0 | - | 4.46 | 28,419 |
| The Portuguese Empire | 0 | - | 4.58 | 12,116 |
| Arthurian Legend | 0 | - | 4.33 | 25,186 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,485 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,346 |
| Geography of the British Empire | 0 | - | 4.48 | 39,864 |
| Medieval English History | 0 | - | 4.53 | 43,679 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,655 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,189 |
| Asia Map Quiz | 0 | - | 4.99 | 926,359 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,049 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,685 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,681 |
| History of Iran | 0 | - | 4.66 | 16,437 |
| The Iraq War | 0 | - | 4.47 | 15,713 |
| Vietnam War Countries | 0 | - | 4.82 | 94,727 |
| Chinese Inventions | 0 | - | 4.30 | 33,872 |
| History of China | 0 | - | 4.35 | 57,655 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,808 |
| China Multiple Choice | 0 | - | 4.50 | 37,432 |
| History of India | 0 | - | 4.62 | 21,524 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,697 |
| Africa Map Quiz | 0 | - | 5.00 | 2,130,326 |
