| Prime Ministers of the UK | 0 | - | 4.95 | 443,239 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,246 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,021 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,785 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,731,758 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,146 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,759 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,770 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,681 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,286 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,594 |
| National Founders | 0 | - | 4.40 | 84,003 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,925 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,933 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,514 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,630 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,997 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,053 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,974 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,582 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,118 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,035 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,038 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,743 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,971 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,874 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,700 |
| Political Movements by Country | 0 | - | 4.46 | 72,842 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,202 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,166 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,175 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,878 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,032 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,832 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,445 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,006 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,434 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,295 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,312 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,065 |
| Name the English Monarchs | 0 | - | 4.91 | 507,472 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,105 |
| Countries of the Popes | 0 | - | 4.78 | 128,913 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,743 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,173 |
| Top 10 Richest Countries in Asia | 0 | - | 4.70 | 106,768 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,121 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,103 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 105,183 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,722 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,844 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,234 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,156 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,506 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,118 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,793 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,697 |
| The Trojan War | 0 | - | 4.83 | 40,091 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,089 |
| Name that Greek Letter | 0 | - | 4.93 | 325,337 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,269 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,705 |
| Roman Emperors | 0 | - | 4.95 | 121,460 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,664 |
| World Capitals Closest to Bangkok | 0 | - | 4.91 | 41,210 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,595 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,954 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,124 |
| Hindu Countries | 0 | - | 4.86 | 50,683 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,610 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,680 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,485 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,770 |
| Presidential Middle Names | 0 | - | 4.42 | 60,813 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,755 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,944 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,260 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,661 |
| The American Revolution | 0 | - | 4.52 | 54,394 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,121 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,568 |
| History of Russia Quiz | 0 | - | 4.47 | 32,029 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,225 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,145 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,546 |
| Ancient Greek Words | 0 | - | 4.93 | 112,691 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,976 |
| History of Italy | 0 | - | 4.55 | 32,187 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,594 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,856 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,470 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,947 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,034 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,150 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,096 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,204 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,100 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,343 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,172 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,563 |
| Singapore Airlines Destinations on a Map | 0 | - | 4.93 | 25,511 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,253 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,688 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,834 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,435 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,672 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,787 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,861 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,226 |
| Europe Map Quiz | 0 | - | 5.00 | 4,793,949 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,255 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,498 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,701 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,755 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,714 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,617 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,505 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,857 |
| Pope Facts | 0 | - | 4.39 | 31,430 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 281,063 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,213 |
| The Vietnam War | 0 | - | 4.44 | 35,694 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,694 |
| Communist Countries in History | 0 | - | 4.63 | 498,819 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,496 |
| Australian Capitals | 0 | - | 4.92 | 62,864 |
| History of Mexico | 0 | - | 4.52 | 15,376 |
| United States Map Quiz | 0 | - | 4.98 | 4,173,827 |
| American Political Words | 0 | - | 4.39 | 23,487 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,225 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,577 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,912 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,202 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,383 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,799 |
| First Ladies of the United States | 0 | - | 4.28 | 86,032 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,339 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,543 |
| U.S. President Scramble | 0 | - | 4.40 | 117,574 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,388 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,123 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,372 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,666 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,117 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,962 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,874 |
| Official European Union Languages | 0 | - | 4.97 | 240,396 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,845 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,437 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,992 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,516 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,239 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Geography of the French Empire | 0 | - | 4.45 | 27,236 |
| The French Revolution | 0 | - | 4.47 | 24,169 |
| History of France | 0 | - | 4.61 | 57,738 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,580 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,669 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,285 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,076 |
| Mythology A-Z | 0 | - | 4.31 | 37,456 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,053 |
| Figures from Greek Mythology | 0 | - | 4.92 | 193,007 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,564 |
| Byzantine History | 0 | - | 4.91 | 29,055 |
| Byzantine Emperors | 0 | - | 4.93 | 14,665 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,172 |
| History of The Netherlands | 0 | - | 4.46 | 17,572 |
| The Vikings! | 0 | - | 4.46 | 28,425 |
| The Portuguese Empire | 0 | - | 4.58 | 12,118 |
| Arthurian Legend | 0 | - | 4.33 | 25,195 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,492 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,393 |
| Geography of the British Empire | 0 | - | 4.48 | 39,882 |
| Medieval English History | 0 | - | 4.53 | 43,692 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,657 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,547 |
| Asia Map Quiz | 0 | - | 4.99 | 926,923 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,062 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,703 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,726 |
| History of Iran | 0 | - | 4.66 | 16,442 |
| The Iraq War | 0 | - | 4.47 | 15,720 |
| Singapore Country Quiz | 0 | - | 4.74 | 45,750 |
| Philippines Country Quiz | 0 | - | 4.56 | 76,047 |
| Thailand Country Quiz | 0 | - | 4.51 | 53,766 |
| Indonesia Country Quiz | 0 | - | 4.78 | 75,751 |
| Largest Indonesian Islands | 0 | - | 4.77 | 50,370 |
| Malaysia Country Quiz | 0 | - | 4.59 | 39,476 |
| Vietnam War Countries | 0 | - | 4.82 | 94,765 |
| Chinese Inventions | 0 | - | 4.30 | 33,876 |
| History of China | 0 | - | 4.35 | 57,694 |
| History of India | 0 | - | 4.62 | 21,530 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,709 |
| Africa Map Quiz | 0 | - | 5.00 | 2,130,984 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,679 |
| History of South Africa | 0 | - | 4.60 | 17,779 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,324 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,238 |
| Countries by Founding Story | 0 | - | 4.95 | 77,923 |
