| Prime Ministers of the UK | 0 | - | 4.95 | 441,368 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,144 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,805 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,554 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,718,784 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,117 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,478 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,730 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,407 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,078 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,409 |
| National Founders | 0 | - | 4.40 | 83,934 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,965 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,124 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,339 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,410 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,604 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,334 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,747 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,081 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,673 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,487 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,622 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,379 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,906 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,030 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,479 |
| Political Movements by Country | 0 | - | 4.46 | 72,708 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,096 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,130 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,049 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,852 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,569 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,691 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,361 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,254 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,129 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,794 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,560 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,507 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,259 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,715 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,462 |
| Name the English Monarchs | 0 | - | 4.91 | 505,382 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,718 |
| Countries of the Popes | 0 | - | 4.79 | 128,560 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,163 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,759 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,072 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,963 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,040 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,334 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,575 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,950 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,684 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,065 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,875 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,578 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,611 |
| The Trojan War | 0 | - | 4.83 | 39,930 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,695 |
| Name that Greek Letter | 0 | - | 4.93 | 324,662 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,672 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,478 |
| Roman Emperors | 0 | - | 4.95 | 120,882 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,376 |
| World Capitals Closest to Bangkok | 0 | - | 4.91 | 41,113 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,744 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,787 |
| Hindu Countries | 0 | - | 4.87 | 50,463 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,483 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,182 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,062 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,417 |
| Presidential Middle Names | 0 | - | 4.41 | 60,602 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,567 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,803 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,148 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,570 |
| The American Revolution | 0 | - | 4.52 | 54,326 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,706 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,064 |
| History of Russia Quiz | 0 | - | 4.47 | 31,985 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,087 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,848 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,963 |
| Ancient Greek Words | 0 | - | 4.93 | 112,239 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,125 |
| History of Italy | 0 | - | 4.55 | 32,107 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,543 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,782 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,379 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,619 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,919 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,039 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,765 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,435 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,972 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,194 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,099 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,239 |
| Singapore Airlines Destinations on a Map | 0 | - | 4.93 | 25,212 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,948 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,411 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,664 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,932 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,444 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,041 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,291 |
| Europe Map Quiz | 0 | - | 5.00 | 4,780,644 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,131 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 215,896 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,093 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,197 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,382 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,974 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,054 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,768 |
| Pope Facts | 0 | - | 4.39 | 31,347 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,299 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,695 |
| The Vietnam War | 0 | - | 4.44 | 35,623 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,036 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,057 |
| Communist Countries in History | 0 | - | 4.63 | 497,470 |
| History of South Africa | 0 | - | 4.60 | 17,742 |
| Oceania Map Quiz | 0 | - | 4.98 | 657,877 |
| Australian Capitals | 0 | - | 4.92 | 62,804 |
| History of Mexico | 0 | - | 4.52 | 15,354 |
| United States Map Quiz | 0 | - | 4.98 | 4,167,781 |
| American Political Words | 0 | - | 4.39 | 23,454 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,203 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,553 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,888 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,775 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,328 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,717 |
| First Ladies of the United States | 0 | - | 4.28 | 85,862 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,029 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,281 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,384 |
| U.S. President Scramble | 0 | - | 4.40 | 117,342 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,313 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,063 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,302 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,030 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,575 |
| Official European Union Languages | 0 | - | 4.97 | 239,433 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,440 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,173 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,868 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,315 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,030 |
| History of Austria | 0 | - | 4.70 | 17,951 |
| Geography of the French Empire | 0 | - | 4.45 | 27,194 |
| The French Revolution | 0 | - | 4.47 | 24,108 |
| History of France | 0 | - | 4.61 | 57,463 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,542 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,505 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,172 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,003 |
| Mythology A-Z | 0 | - | 4.31 | 37,350 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,921 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,354 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,379 |
| Byzantine History | 0 | - | 4.91 | 28,987 |
| Byzantine Emperors | 0 | - | 4.92 | 14,500 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,524 |
| History of The Netherlands | 0 | - | 4.46 | 17,529 |
| The Vikings! | 0 | - | 4.46 | 28,391 |
| The Portuguese Empire | 0 | - | 4.58 | 12,095 |
| Arthurian Legend | 0 | - | 4.33 | 25,156 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,435 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,112 |
| Geography of the British Empire | 0 | - | 4.48 | 39,813 |
| Medieval English History | 0 | - | 4.53 | 43,618 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,645 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,451,084 |
| Asia Map Quiz | 0 | - | 4.99 | 923,011 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,997 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,575 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,441 |
| History of Iran | 0 | - | 4.66 | 16,404 |
| The Iraq War | 0 | - | 4.47 | 15,691 |
| Vietnam War Countries | 0 | - | 4.82 | 94,497 |
| Chinese Inventions | 0 | - | 4.30 | 33,845 |
| History of China | 0 | - | 4.35 | 57,466 |
| History of India | 0 | - | 4.62 | 21,488 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,599 |
| Africa Map Quiz | 0 | - | 5.00 | 2,125,943 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,140 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,912 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,819 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,024 |
| Countries by Founding Story | 0 | - | 4.95 | 77,613 |
| Independence from Whom | 0 | - | 4.99 | 212,647 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,139 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,718 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,307 |
| Add A Letter - Make a European City | 0 | - | 4.90 | 23,469 |
