| Prime Ministers of the UK | 0 | - | 4.95 | 443,368 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,732,576 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,250 |
| World Capitals Closest to Jerusalem | 0 | - | 4.47 | 45,108 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,117 |
| Countries of the Popes | 0 | - | 4.78 | 128,936 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,146 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,032 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,773 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,774 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,703 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,604 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,974 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,983 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,592 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,649 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,020 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,694 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,494 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,793 |
| Presidential Middle Names | 0 | - | 4.42 | 60,823 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,758 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,952 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,262 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,666 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,091 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,986 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,623 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,205 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,072 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,065 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,768 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,526 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,596 |
| Pope Facts | 0 | - | 4.39 | 31,435 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,931 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,709 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,184 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,574 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,105 |
| Name the English Monarchs | 0 | - | 4.91 | 507,583 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,196 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,851 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,940 |
| Vietnam War Countries | 0 | - | 4.82 | 94,779 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,748 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,250 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,128 |
| U.S. Bill of Rights | 0 | - | 4.53 | 34,224 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,218 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,385 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,806 |
| First Ladies of the United States | 0 | - | 4.28 | 86,039 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,339 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,546 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,392 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,126 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,700 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,069 |
| Top 10 Most Jewish U.S. States | 0 | - | 4.31 | 43,201 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,965 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,838 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,704 |
| The Trojan War | 0 | - | 4.83 | 40,111 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,273 |
| Name that Greek Letter | 0 | - | 4.93 | 325,379 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,329 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,720 |
| Roman Emperors | 0 | - | 4.95 | 121,499 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,842 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,552 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 87,062 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,763 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,679 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,134 |
| Countries that Beat Israel | 0 | - | 4.38 | 30,470 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,964 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,147 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,855 |
| National Founders | 0 | - | 4.40 | 84,004 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,790 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,783 |
| The John Adams Presidency | 0 | - | 4.12 | 8,799 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,788 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,945 |
| The American Revolution | 0 | - | 4.52 | 54,395 |
| U.S. States by Church Attendance | 0 | - | 4.59 | 32,588 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,593 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,974 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,156 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,651 |
| Ancient Greek Words | 0 | - | 4.93 | 112,725 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 128,060 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,040 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,121 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,178 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,302 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,595 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,270 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,414 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,174 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,882 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.38 | 24,094 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,470 |
| The George Washington Presidency | 0 | - | 4.03 | 14,622 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 17,004 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,398 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,778 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,681 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,851 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,914 |
| Europe Map Quiz | 0 | - | 5.00 | 4,794,799 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,217 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,268 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,728 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,780 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,931 |
| History of Russia Quiz | 0 | - | 4.47 | 32,031 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,733 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,650 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.89 | 114,596 |
| History of Italy | 0 | - | 4.55 | 32,195 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,861 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,480 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,153 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,323 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,355 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,248 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,845 |
| Communist Countries in History | 0 | - | 4.63 | 498,894 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,654 |
| Australian Capitals | 0 | - | 4.92 | 62,866 |
| History of Mexico | 0 | - | 4.52 | 15,377 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,165 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,211 |
| Win the U.S. Presidential Election | 0 | - | 4.79 | 637,662 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,625 |
| U.S. President Scramble | 0 | - | 4.40 | 117,587 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,372 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,122 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,752 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,884 |
| Official European Union Languages | 0 | - | 4.97 | 240,434 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,870 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,528 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,996 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,561 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,528 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,251 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Geography of the French Empire | 0 | - | 4.45 | 27,240 |
| The French Revolution | 0 | - | 4.47 | 24,173 |
| History of France | 0 | - | 4.61 | 57,761 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,580 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 146,137 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,293 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,077 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,077 |
| Figures from Greek Mythology | 0 | - | 4.92 | 193,967 |
| Countries Italy Declared War On | 0 | - | 4.74 | 49,253 |
| Byzantine History | 0 | - | 4.91 | 29,063 |
| Byzantine Emperors | 0 | - | 4.93 | 14,669 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,200 |
| History of The Netherlands | 0 | - | 4.46 | 17,580 |
| The Vikings! | 0 | - | 4.46 | 28,430 |
| The Portuguese Empire | 0 | - | 4.58 | 12,120 |
| Arthurian Legend | 0 | - | 4.33 | 25,196 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,496 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,406 |
| Geography of the British Empire | 0 | - | 4.48 | 39,888 |
| Medieval English History | 0 | - | 4.53 | 43,698 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,657 |
| Asia Map Quiz | 0 | - | 4.99 | 927,097 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 281,116 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,708 |
| Top 10 Richest Countries in Asia | 0 | - | 4.70 | 106,781 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,749 |
| History of Iran | 0 | - | 4.66 | 16,443 |
| The Iraq War | 0 | - | 4.47 | 15,721 |
| Israel Country Quiz | 0 | - | 3.82 | 75,350 |
| Chinese Inventions | 0 | - | 4.30 | 33,877 |
| History of China | 0 | - | 4.35 | 57,703 |
| History of India | 0 | - | 4.62 | 21,531 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,719 |
| Africa Map Quiz | 0 | - | 5.00 | 2,131,283 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,733 |
| History of South Africa | 0 | - | 4.60 | 17,782 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,366 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,248 |
| Countries by Founding Story | 0 | - | 4.95 | 77,938 |
| Independence from Whom | 0 | - | 4.99 | 213,512 |
| Political Movements by Country | 0 | - | 4.46 | 72,846 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,741 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,949 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.96 | 51,634 |
| Australian States and Territories | 0 | - | 4.96 | 143,115 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,556 |
| Australia Map Quiz | 0 | - | 4.95 | 346,582 |
| Australia True or False | 0 | - | 4.87 | 57,231 |
| Flags of North and South America | 0 | - | 4.99 | 378,409 |
