| Prime Ministers of the UK | 0 | - | 4.95 | 438,976 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,683 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,169 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,941 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,532 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 134,448 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,698,691 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,066 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,247 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,068 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,006 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,747 |
| National Founders | 0 | - | 4.40 | 83,842 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,462 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,578 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,133 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,457 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,805 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,304 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,319 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,836 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,677 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,010 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,886 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,809 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,008 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,819 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,256 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,864 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,603 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,605 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,982 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,878 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,410 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,330 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,618 |
| Name the English Monarchs | 0 | - | 4.91 | 502,661 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,205 |
| Countries of the Popes | 0 | - | 4.79 | 128,111 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,232 |
| Top 10 Richest Countries in Asia | 0 | - | 4.74 | 105,684 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,947 |
| Political Movements by Country | 0 | - | 4.46 | 72,530 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,270 |
| Hindu Countries | 0 | - | 4.86 | 50,148 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,272 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,568 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,073 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,533 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,810 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,797 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,492 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,729 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,814 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,058 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,499 |
| The Trojan War | 0 | - | 4.83 | 39,728 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,432 |
| Name that Greek Letter | 0 | - | 4.93 | 323,452 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,844 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,534 |
| Roman Emperors | 0 | - | 4.95 | 120,048 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,282 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,738 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,900 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,665 |
| China A-Z | 0 | - | 4.55 | 67,241 |
| China by Picture | 0 | - | 4.51 | 63,212 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,281 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,020 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,318 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,729 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,491 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,804 |
| Presidential Middle Names | 0 | - | 4.41 | 60,247 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,343 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,596 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,988 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,433 |
| The American Revolution | 0 | - | 4.52 | 54,255 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,485 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,956 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,472 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,836 |
| Ancient Greek Words | 0 | - | 4.93 | 111,599 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,981 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,454 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,264 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,783 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,348 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,871 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,979 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,696 |
| All Cities in China with Population of 1 Million | 0 | - | 4.82 | 46,063 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,342 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,442 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,268 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,259 |
| First Ladies of the United States | 0 | - | 4.28 | 85,640 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,228 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 77,094 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,952 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,194 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,012 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,965 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,793 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 134,202 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,828 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,789 |
| Europe Map Quiz | 0 | - | 5.00 | 4,763,001 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,553 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,988 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,373 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,564 |
| History of Russia Quiz | 0 | - | 4.47 | 31,918 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,592 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,303 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,190 |
| History of Italy | 0 | - | 4.55 | 31,975 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,113 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,661 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,237 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,866 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,666 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,816 |
| Pope Facts | 0 | - | 4.39 | 31,246 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,003 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,007 |
| The Vietnam War | 0 | - | 4.44 | 35,529 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,566 |
| Japan by Picture | 0 | - | 4.45 | 29,236 |
| Communist Countries in History | 0 | - | 4.63 | 495,729 |
| History of India | 0 | - | 4.62 | 21,425 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,446 |
| Africa Map Quiz | 0 | - | 5.00 | 2,117,891 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,214 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,903 |
| History of South Africa | 0 | - | 4.60 | 17,688 |
| Oceania Map Quiz | 0 | - | 4.98 | 642,316 |
| Australian Capitals | 0 | - | 4.92 | 62,722 |
| History of Mexico | 0 | - | 4.58 | 15,309 |
| United States Map Quiz | 0 | - | 4.98 | 4,158,454 |
| American Political Words | 0 | - | 4.39 | 23,423 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,158 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,522 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,863 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,500 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,192 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,955 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,677 |
| U.S. President Scramble | 0 | - | 4.40 | 116,774 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,186 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,890 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,129 |
| Official European Union Languages | 0 | - | 4.97 | 238,504 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,857 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,202 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,715 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 213,419 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,023 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,741 |
| History of Austria | 0 | - | 4.70 | 17,861 |
| Geography of the French Empire | 0 | - | 4.45 | 27,060 |
| The French Revolution | 0 | - | 4.47 | 23,933 |
| History of France | 0 | - | 4.59 | 56,979 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,996 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,913 |
| Mythology A-Z | 0 | - | 4.31 | 37,220 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,959 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,157 |
| Byzantine History | 0 | - | 4.91 | 28,867 |
| Byzantine Emperors | 0 | - | 4.92 | 14,111 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,892 |
| History of The Netherlands | 0 | - | 4.46 | 17,435 |
| The Vikings! | 0 | - | 4.46 | 28,343 |
| The Portuguese Empire | 0 | - | 4.58 | 12,064 |
| Arthurian Legend | 0 | - | 4.33 | 25,109 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,351 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,478 |
| Geography of the British Empire | 0 | - | 4.48 | 39,672 |
| Medieval English History | 0 | - | 4.53 | 43,507 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,609 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,448,232 |
| Asia Map Quiz | 0 | - | 4.99 | 916,770 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 279,151 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,908 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,440 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,042 |
| History of Iran | 0 | - | 4.66 | 16,357 |
| The Iraq War | 0 | - | 4.47 | 15,655 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,129 |
| Vietnam War Countries | 0 | - | 4.82 | 94,223 |
| Chinese Inventions | 0 | - | 4.30 | 33,800 |
| History of China | 0 | - | 4.37 | 57,193 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,214 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,708 |
| Countries by Founding Story | 0 | - | 4.95 | 77,217 |
| Independence from Whom | 0 | - | 4.99 | 211,703 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,979 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,477 |
