| Prime Ministers of the UK | 0 | - | 4.95 | 440,230 |
| Prime Ministers of Australia | 0 | - | 4.50 | 32,020 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,665 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,709,891 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,285 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,725 |
| Australia Map Quiz | 0 | - | 4.95 | 345,268 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,209 |
| National Founders | 0 | - | 4.40 | 83,893 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,158 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,218 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,101 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,401 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,291 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,709 |
| Australia Cities Map Quiz | 0 | - | 4.82 | 145,779 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,782 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,677 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,500 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,791 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,616 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,142 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,359 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,172 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,869 |
| Political Movements by Country | 0 | - | 4.46 | 72,631 |
| Most Visited Countries by Australians | 0 | - | 4.95 | 90,695 |
| Countries that Visit Australia the Most | 0 | - | 4.92 | 69,300 |
| Countries Closest to Australia | 0 | - | 4.99 | 167,166 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,044 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,955 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,594 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,863 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,435 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,045 |
| Name the English Monarchs | 0 | - | 4.91 | 504,159 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,463 |
| Countries of the Popes | 0 | - | 4.79 | 128,370 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,524 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,651 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,121 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,790 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,838 |
| Australia A-Z | 0 | - | 4.54 | 50,033 |
| Countries that Beat Australia | 0 | - | 4.92 | 93,045 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,356 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,110 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,558 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,832 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,288 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,059 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,973 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,421 |
| The Trojan War | 0 | - | 4.83 | 39,808 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,115 |
| Name that Greek Letter | 0 | - | 4.93 | 324,227 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,296 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,664 |
| Roman Emperors | 0 | - | 4.95 | 120,442 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,325 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,082 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,538 |
| Hindu Countries | 0 | - | 4.86 | 50,324 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,458 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,963 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,753 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,039 |
| Presidential Middle Names | 0 | - | 4.41 | 60,439 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,473 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,680 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,496 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,754 |
| History of Russia Quiz | 0 | - | 4.47 | 31,957 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,562 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,034 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,700 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,034 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,567 |
| History of Italy | 0 | - | 4.55 | 32,062 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,725 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,307 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,858 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,968 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,556 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,920 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,988 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,306 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,230 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,561 |
| Famous Australians by Picture | 0 | - | 4.25 | 28,858 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,411 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,525 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,065 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,234 |
| The American Revolution | 0 | - | 4.52 | 54,296 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,505 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,674 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,928 |
| Europe Map Quiz | 0 | - | 5.00 | 4,772,572 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,059 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,815 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,777 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,673 |
| Ancient Greek Words | 0 | - | 4.93 | 111,942 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,503 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,441 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,155 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,729 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,913 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,758 |
| The Vietnam War | 0 | - | 4.44 | 35,584 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,650 |
| Communist Countries in History | 0 | - | 4.63 | 496,660 |
| History of South Africa | 0 | - | 4.60 | 17,723 |
| Oceania Map Quiz | 0 | - | 4.98 | 654,495 |
| Australian Capitals | 0 | - | 4.92 | 62,760 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,680 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,180 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,541 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,875 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,536 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,290 |
| First Ladies of the United States | 0 | - | 4.28 | 85,763 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,251 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,288 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,240 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 24,006 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,862 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,354 |
| Official European Union Languages | 0 | - | 4.97 | 238,974 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,171 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,216 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,766 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,899 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,835 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,875 |
| History of Austria | 0 | - | 4.70 | 17,913 |
| Geography of the French Empire | 0 | - | 4.45 | 27,158 |
| The French Revolution | 0 | - | 4.47 | 24,071 |
| History of France | 0 | - | 4.61 | 57,302 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,396 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,808 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,176 |
| The Vikings! | 0 | - | 4.46 | 28,372 |
| The Portuguese Empire | 0 | - | 4.58 | 12,086 |
| Arthurian Legend | 0 | - | 4.33 | 25,132 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,410 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,729 |
| Geography of the British Empire | 0 | - | 4.48 | 39,744 |
| Pope Facts | 0 | - | 4.39 | 31,305 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,449,854 |
| Asia Map Quiz | 0 | - | 4.99 | 920,041 |
| History of Iran | 0 | - | 4.66 | 16,384 |
| History of China | 0 | - | 4.37 | 57,354 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,382 |
| History of India | 0 | - | 4.62 | 21,462 |
| Africa Map Quiz | 0 | - | 5.00 | 2,122,325 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,047 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,530 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,890 |
| Countries by Founding Story | 0 | - | 4.95 | 77,411 |
| Independence from Whom | 0 | - | 4.99 | 212,198 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,804 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,618 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,987 |
| Cultural Symbols of Australia | 0 | - | 4.24 | 48,011 |
| History of Mexico | 0 | - | 4.58 | 15,339 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,050 |
| U.S. States by Governor | 0 | - | 4.43 | 18,080 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,717 |
| American Political Words | 0 | - | 4.39 | 23,439 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,713 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,481 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,543 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,214 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,984 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,765 |
| U.S. President Scramble | 0 | - | 4.40 | 117,135 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,232 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,955 |
| Events in U.S. History | 0 | - | 4.41 | 28,720 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,137 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,208 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 212,874 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,747 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,275 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,655 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,140 |
| Europe Geography Decoder | 0 | - | 4.86 | 70,122 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,757 |
| The Only European Country ... | 0 | - | 4.91 | 217,512 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,648 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,170 |
| French History Multiple Choice | 0 | - | 4.55 | 33,133 |
| History of Germany | 0 | - | 4.39 | 52,906 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,087 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,951 |
| Mythology A-Z | 0 | - | 4.31 | 37,298 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,924 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,720 |
