| Prime Ministers of the UK | 0 | - | 4.95 | 443,411 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,251 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,043 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,732,967 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,780 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,132 |
| Australia Map Quiz | 0 | - | 4.95 | 346,611 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,710 |
| National Founders | 0 | - | 4.40 | 84,005 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,000 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,530 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,147 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,998 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,655 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,774 |
| Australia Cities Map Quiz | 0 | - | 4.83 | 146,741 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,033 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,112 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,990 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,640 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,240 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,087 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,076 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,783 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,974 |
| Political Movements by Country | 0 | - | 4.46 | 72,849 |
| Most Visited Countries by Australians | 0 | - | 4.95 | 90,989 |
| Countries that Visit Australia the Most | 0 | - | 4.92 | 69,745 |
| Countries Closest to Australia | 0 | - | 4.99 | 168,032 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,218 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,194 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,841 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,063 |
| Countries Italy Declared War On | 0 | - | 4.74 | 49,737 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,123 |
| Name the English Monarchs | 0 | - | 4.91 | 507,647 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,127 |
| Countries of the Popes | 0 | - | 4.78 | 128,946 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,208 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,876 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,756 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,256 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,537 |
| Australia A-Z | 0 | - | 4.54 | 50,172 |
| Countries that Beat Australia | 0 | - | 4.92 | 93,600 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,177 |
| U.S. Bill of Rights | 0 | - | 4.53 | 34,756 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,884 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,086 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,478 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,447 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,330 |
| The Trojan War | 0 | - | 4.83 | 40,119 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,338 |
| Name that Greek Letter | 0 | - | 4.93 | 325,401 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,349 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,728 |
| Roman Emperors | 0 | - | 4.95 | 121,515 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,849 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,563 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 87,068 |
| Hindu Countries | 0 | - | 4.86 | 50,706 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,178 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,707 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,505 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,797 |
| Presidential Middle Names | 0 | - | 4.42 | 60,837 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,767 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,958 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,668 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,245 |
| History of Russia Quiz | 0 | - | 4.47 | 32,031 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,704 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,238 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,160 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,698 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 128,094 |
| History of Italy | 0 | - | 4.55 | 32,198 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,866 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,481 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,043 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,156 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,130 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,307 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,105 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,607 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,704 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,848 |
| Famous Australians by Picture | 0 | - | 4.25 | 28,989 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,618 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,479 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,265 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,689 |
| The American Revolution | 0 | - | 4.52 | 54,397 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,876 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,935 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,237 |
| Europe Map Quiz | 0 | - | 5.00 | 4,795,077 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,270 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,605 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,588 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,665 |
| Ancient Greek Words | 0 | - | 4.93 | 112,732 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,596 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,976 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,239 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,861 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,110 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 281,127 |
| The Vietnam War | 0 | - | 4.44 | 35,697 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,752 |
| Communist Countries in History | 0 | - | 4.63 | 498,920 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,773 |
| Australian Capitals | 0 | - | 4.92 | 62,884 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,812 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,228 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,580 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,915 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,229 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,385 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,808 |
| First Ladies of the United States | 0 | - | 4.28 | 86,039 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,342 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,550 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,392 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,127 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,720 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,965 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,887 |
| Official European Union Languages | 0 | - | 4.97 | 240,455 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,877 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,560 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,740 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,797 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,742 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,257 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Geography of the French Empire | 0 | - | 4.45 | 27,241 |
| The French Revolution | 0 | - | 4.47 | 24,175 |
| History of France | 0 | - | 4.61 | 57,765 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,581 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,676 |
| Figures from Greek Mythology | 0 | - | 4.92 | 194,381 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,648 |
| The Vikings! | 0 | - | 4.46 | 28,432 |
| The Portuguese Empire | 0 | - | 4.58 | 12,120 |
| Arthurian Legend | 0 | - | 4.33 | 25,199 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,498 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,411 |
| Geography of the British Empire | 0 | - | 4.48 | 39,889 |
| Pope Facts | 0 | - | 4.39 | 31,438 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,699 |
| Asia Map Quiz | 0 | - | 4.99 | 927,186 |
| History of Iran | 0 | - | 4.66 | 16,444 |
| History of China | 0 | - | 4.35 | 57,708 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,713 |
| History of India | 0 | - | 4.62 | 21,531 |
| Africa Map Quiz | 0 | - | 5.00 | 2,131,387 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,698 |
| History of South Africa | 0 | - | 4.60 | 17,784 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,374 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,252 |
| Countries by Founding Story | 0 | - | 4.95 | 77,947 |
| Independence from Whom | 0 | - | 4.99 | 213,534 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,751 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,955 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.96 | 51,644 |
| Cultural Symbols of Australia | 0 | - | 4.24 | 48,089 |
| History of Mexico | 0 | - | 4.52 | 15,381 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,290 |
| U.S. States by Governor | 0 | - | 4.43 | 18,129 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,790 |
| American Political Words | 0 | - | 4.39 | 23,489 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,815 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,797 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,625 |
| U.S. President Scramble | 0 | - | 4.40 | 117,591 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,373 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,123 |
| Events in U.S. History | 0 | - | 4.41 | 28,868 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,226 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,535 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 214,478 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 93,011 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,362 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,686 |
| Europe Geography Decoder | 0 | - | 4.87 | 70,412 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,598 |
| The Only European Country ... | 0 | - | 4.91 | 219,755 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,918 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,534 |
| French History Multiple Choice | 0 | - | 4.55 | 33,284 |
| History of Germany | 0 | - | 4.39 | 53,010 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,301 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,081 |
| Mythology A-Z | 0 | - | 4.31 | 37,468 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,537 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,908 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,087 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,416 |
