| Prime Ministers of the UK | 0 | - | 4.96 | 436,445 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,778 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,256 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,672,426 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,588 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,201 |
| Australia Map Quiz | 0 | - | 4.94 | 343,188 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,651 |
| National Founders | 0 | - | 4.40 | 83,727 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,888 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,729 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,023 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,291 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,820 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,613 |
| Australia Cities Map Quiz | 0 | - | 4.83 | 144,786 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,775 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,632 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,917 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,486 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,813 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,915 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,456 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,327 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,708 |
| Political Movements by Country | 0 | - | 4.46 | 72,376 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,276 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,145 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,733 |
| Most Visited Countries by Australians | 0 | - | 4.94 | 90,369 |
| Countries that Visit Australia the Most | 0 | - | 4.92 | 68,738 |
| Countries Closest to Australia | 0 | - | 4.99 | 166,528 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,841 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,665 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,285 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,002 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,125 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,787 |
| Name the English Monarchs | 0 | - | 4.92 | 499,901 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,535 |
| Countries of the Popes | 0 | - | 4.79 | 127,560 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,653 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 119,081 |
| Hindu Countries | 0 | - | 4.86 | 49,802 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,489 |
| Australia A-Z | 0 | - | 4.54 | 49,868 |
| Countries that Beat Australia | 0 | - | 4.92 | 92,367 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,960 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,419 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,695 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,709 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,729 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,388 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,426 |
| The Trojan War | 0 | - | 4.83 | 39,549 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,334 |
| Name that Greek Letter | 0 | - | 4.93 | 322,461 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,109 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,259 |
| Roman Emperors | 0 | - | 4.95 | 119,159 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,620 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,804 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,606 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,169 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,233 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,890 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,300 |
| Presidential Middle Names | 0 | - | 4.41 | 59,908 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,963 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,177 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,267 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,605 |
| History of Russia Quiz | 0 | - | 4.49 | 31,837 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,383 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,819 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,061 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,188 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,001 |
| History of Italy | 0 | - | 4.55 | 31,892 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,554 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,083 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,626 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,702 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,853 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,359 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,872 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,837 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,315 |
| Famous Australians by Picture | 0 | - | 4.25 | 28,675 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,120 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,093 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,844 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,653 |
| The American Revolution | 0 | - | 4.52 | 54,136 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,440 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,182 |
| Europe Map Quiz | 0 | - | 5.00 | 4,744,305 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,836 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,888 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 210,903 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,090 |
| Ancient Greek Words | 0 | - | 4.93 | 111,058 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,374 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 107,921 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,305 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,449 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,635 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,089 |
| The Vietnam War | 0 | - | 4.43 | 35,392 |
| Communist Countries in History | 0 | - | 4.63 | 493,758 |
| History of India | 0 | - | 4.61 | 21,336 |
| Africa Map Quiz | 0 | - | 5.00 | 2,110,086 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,608 |
| History of South Africa | 0 | - | 4.60 | 17,635 |
| Oceania Map Quiz | 0 | - | 4.98 | 638,234 |
| Australian Capitals | 0 | - | 4.92 | 62,652 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,113 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,489 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,830 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,596 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,195 |
| First Ladies of the United States | 0 | - | 4.28 | 85,359 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,157 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,645 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,076 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,878 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,729 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,834 |
| Official European Union Languages | 0 | - | 4.97 | 237,590 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,278 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,422 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,608 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,843 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,177 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,440 |
| History of Austria | 0 | - | 4.70 | 17,794 |
| Geography of the French Empire | 0 | - | 4.45 | 26,991 |
| The French Revolution | 0 | - | 4.46 | 23,856 |
| History of France | 0 | - | 4.59 | 56,566 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,422 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,082 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,764 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,997 |
| The Vikings! | 0 | - | 4.46 | 28,282 |
| The Portuguese Empire | 0 | - | 4.58 | 12,026 |
| Arthurian Legend | 0 | - | 4.33 | 25,074 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,257 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,071 |
| Geography of the British Empire | 0 | - | 4.48 | 39,571 |
| Pope Facts | 0 | - | 4.39 | 31,124 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,708 |
| Asia Map Quiz | 0 | - | 4.99 | 910,529 |
| History of Iran | 0 | - | 4.66 | 16,299 |
| History of China | 0 | - | 4.37 | 56,897 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,030 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,520 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,402 |
| Countries by Founding Story | 0 | - | 4.95 | 76,837 |
| Independence from Whom | 0 | - | 4.99 | 210,527 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,265 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,192 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,295 |
| Countries of Africa | 0 | - | 5.00 | 2,519,947 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,220 |
| African East Coast | 0 | - | 4.96 | 95,474 |
| Western Africa Map Quiz | 0 | - | 4.97 | 73,325 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,158 |
| Cultural Symbols of Australia | 0 | - | 4.24 | 47,909 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,514 |
| History of Mexico | 0 | - | 4.58 | 15,257 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,727 |
| U.S. States by Governor | 0 | - | 4.43 | 18,012 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,616 |
| American Political Words | 0 | - | 4.39 | 23,375 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,600 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,113 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,404 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,126 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,863 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,532 |
| U.S. President Scramble | 0 | - | 4.40 | 116,436 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,078 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,772 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,043 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,715 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 210,988 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,441 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,147 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,829 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,129 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,732 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,231 |
| The Only European Country ... | 0 | - | 4.91 | 214,994 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,238 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,761 |
| French History Multiple Choice | 0 | - | 4.55 | 32,935 |
| History of Germany | 0 | - | 4.39 | 52,712 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,862 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,833 |
| Mythology A-Z | 0 | - | 4.31 | 37,094 |
