| Prime Ministers of the UK | 0 | - | 4.95 | 437,819 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,849 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,431 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 130,689 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,688,087 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,051 |
| Country by Photo of its Leader | 0 | - | 4.72 | 123,858 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,648 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,838 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,611 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,066 |
| National Founders | 0 | - | 4.40 | 83,792 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,866 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,088 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,873 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,001 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,168 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,341 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,153 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,882 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,122 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,281 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,701 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,609 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,763 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,292 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,170 |
| Political Movements by Country | 0 | - | 4.46 | 72,466 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,609 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,145 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,447 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,070 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,340 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,924 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,063 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,798 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,753 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,511 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,390 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,426 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,945 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,691 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,780 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,248 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,234 |
| Name the English Monarchs | 0 | - | 4.91 | 501,481 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,906 |
| Countries of the Popes | 0 | - | 4.79 | 127,866 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,560 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,008 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,516 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,559 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,917 |
| Hindu Countries | 0 | - | 4.86 | 50,006 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,425 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,502 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,442 |
| The Trojan War | 0 | - | 4.83 | 39,649 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,109 |
| Name that Greek Letter | 0 | - | 4.93 | 323,087 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,535 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,418 |
| Roman Emperors | 0 | - | 4.95 | 119,655 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,691 |
| World Capitals Closest to Bangkok | 0 | - | 4.91 | 40,958 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,100 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,057 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,840 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,338 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,243 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,528 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,255 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,592 |
| Presidential Middle Names | 0 | - | 4.41 | 60,103 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,183 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,436 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,937 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,356 |
| The American Revolution | 0 | - | 4.52 | 54,212 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,692 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,246 |
| History of Russia Quiz | 0 | - | 4.49 | 31,879 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,903 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,319 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,568 |
| Ancient Greek Words | 0 | - | 4.93 | 111,350 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,530 |
| History of Italy | 0 | - | 4.55 | 31,936 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,411 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,613 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,165 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,120 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,730 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,794 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,158 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,636 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,739 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,905 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,918 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,462 |
| Singapore Airlines Destinations on a Map | 0 | - | 4.93 | 24,661 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,044 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,870 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,613 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,862 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,327 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,844 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,634 |
| Europe Map Quiz | 0 | - | 5.00 | 4,755,447 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,917 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 212,234 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,045 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,240 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,428 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,662 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,304 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,606 |
| Pope Facts | 0 | - | 4.39 | 31,201 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,679 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 169,728 |
| The Vietnam War | 0 | - | 4.44 | 35,481 |
| Communist Countries in History | 0 | - | 4.63 | 494,912 |
| History of India | 0 | - | 4.61 | 21,396 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,388 |
| Africa Map Quiz | 0 | - | 5.00 | 2,114,636 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,797 |
| History of South Africa | 0 | - | 4.60 | 17,660 |
| Oceania Map Quiz | 0 | - | 4.98 | 640,578 |
| Australian Capitals | 0 | - | 4.92 | 62,694 |
| History of Mexico | 0 | - | 4.58 | 15,291 |
| United States Map Quiz | 0 | - | 4.98 | 4,153,932 |
| American Political Words | 0 | - | 4.39 | 23,396 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,135 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,504 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,853 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,050 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,241 |
| First Ladies of the United States | 0 | - | 4.28 | 85,534 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,927 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,201 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,928 |
| U.S. President Scramble | 0 | - | 4.40 | 116,634 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,158 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,934 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,146 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,844 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,795 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,998 |
| Official European Union Languages | 0 | - | 4.97 | 238,124 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,614 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,493 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,642 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,921 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,606 |
| History of Austria | 0 | - | 4.70 | 17,834 |
| Geography of the French Empire | 0 | - | 4.45 | 27,025 |
| The French Revolution | 0 | - | 4.46 | 23,901 |
| History of France | 0 | - | 4.59 | 56,829 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,464 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,223 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,937 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,875 |
| Mythology A-Z | 0 | - | 4.31 | 37,166 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,439 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,024 |
| Byzantine History | 0 | - | 4.91 | 28,755 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,528 |
| History of The Netherlands | 0 | - | 4.46 | 17,407 |
| The Vikings! | 0 | - | 4.46 | 28,319 |
| The Portuguese Empire | 0 | - | 4.58 | 12,047 |
| Arthurian Legend | 0 | - | 4.33 | 25,094 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,307 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,299 |
| Geography of the British Empire | 0 | - | 4.48 | 39,631 |
| Medieval English History | 0 | - | 4.53 | 43,462 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,594 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,446,518 |
| Asia Map Quiz | 0 | - | 4.99 | 914,455 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,880 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,365 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,832 |
| History of Iran | 0 | - | 4.66 | 16,340 |
| The Iraq War | 0 | - | 4.47 | 15,637 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,101 |
| Vietnam War Countries | 0 | - | 4.82 | 94,077 |
| Chinese Inventions | 0 | - | 4.30 | 33,780 |
| History of China | 0 | - | 4.37 | 57,046 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,950 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,581 |
| Countries by Founding Story | 0 | - | 4.95 | 77,047 |
| Independence from Whom | 0 | - | 4.99 | 211,267 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,672 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,367 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,539 |
| Countries of Africa | 0 | - | 5.00 | 2,530,078 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,868 |
| Flags of Africa Quiz | 0 | - | 5.00 | 469,257 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,601 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 216,637 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 116,384 |
