| Prime Ministers of the UK | 0 | - | 4.95 | 441,956 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,178 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,880 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,722,818 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,573 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,952 |
| The Dictator Files: Saddam Hussein | 0 | - | 4.48 | 15,920 |
| Australia Map Quiz | 0 | - | 4.95 | 346,020 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,192 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,497 |
| National Founders | 0 | - | 4.40 | 83,955 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,277 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,400 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,126 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,411 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,476 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,743 |
| Australia Cities Map Quiz | 0 | - | 4.82 | 146,421 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,732 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,623 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,819 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,246 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,131 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,658 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,747 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,495 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,921 |
| Political Movements by Country | 0 | - | 4.46 | 72,743 |
| Most Visited Countries by Australians | 0 | - | 4.95 | 90,867 |
| Countries that Visit Australia the Most | 0 | - | 4.92 | 69,543 |
| Countries Closest to Australia | 0 | - | 4.99 | 167,746 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,125 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,072 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,727 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,562 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,613 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,636 |
| Name the English Monarchs | 0 | - | 4.91 | 505,976 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,847 |
| Countries of the Popes | 0 | - | 4.79 | 128,667 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,885 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,021 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,436 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,039 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,256 |
| Australia A-Z | 0 | - | 4.54 | 50,126 |
| Countries that Beat Australia | 0 | - | 4.92 | 93,386 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,384 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,138 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,590 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,859 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,681 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,054 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,254 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,972 |
| The Trojan War | 0 | - | 4.83 | 39,953 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,341 |
| Name that Greek Letter | 0 | - | 4.93 | 324,848 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,836 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,549 |
| Roman Emperors | 0 | - | 4.95 | 121,084 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,593 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,331 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,817 |
| Hindu Countries | 0 | - | 4.87 | 50,541 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,922 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,367 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,241 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,562 |
| Presidential Middle Names | 0 | - | 4.41 | 60,676 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,632 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,875 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,613 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,213 |
| History of Russia Quiz | 0 | - | 4.47 | 31,997 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,630 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,115 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,959 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,432 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,361 |
| History of Italy | 0 | - | 4.55 | 32,133 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,807 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,412 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,963 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,073 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,895 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,155 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,055 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,478 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,516 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,725 |
| Famous Australians by Picture | 0 | - | 4.25 | 28,930 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,524 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,109 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,178 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,536 |
| The American Revolution | 0 | - | 4.52 | 54,345 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,295 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,466 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,116 |
| Europe Map Quiz | 0 | - | 5.00 | 4,784,706 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,168 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,204 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 216,353 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,188 |
| Ancient Greek Words | 0 | - | 4.93 | 112,367 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,561 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,723 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,596 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,786 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,003 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,519 |
| The Vietnam War | 0 | - | 4.44 | 35,638 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,233 |
| Communist Countries in History | 0 | - | 4.63 | 497,866 |
| History of South Africa | 0 | - | 4.60 | 17,756 |
| Oceania Map Quiz | 0 | - | 4.98 | 658,718 |
| Australian Capitals | 0 | - | 4.92 | 62,822 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,756 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,211 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,560 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,898 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,909 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,355 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,755 |
| First Ladies of the United States | 0 | - | 4.28 | 85,919 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,303 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,444 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,349 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,083 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 57,567 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,934 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,661 |
| Official European Union Languages | 0 | - | 4.97 | 239,643 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,556 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,586 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,243 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,335 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,485 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,108 |
| History of Austria | 0 | - | 4.70 | 17,967 |
| Geography of the French Empire | 0 | - | 4.45 | 27,207 |
| The French Revolution | 0 | - | 4.47 | 24,133 |
| History of France | 0 | - | 4.61 | 57,553 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,554 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,567 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,657 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,499 |
| The Vikings! | 0 | - | 4.46 | 28,400 |
| The Portuguese Empire | 0 | - | 4.58 | 12,099 |
| Arthurian Legend | 0 | - | 4.33 | 25,166 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,446 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,190 |
| Geography of the British Empire | 0 | - | 4.48 | 39,835 |
| Pope Facts | 0 | - | 4.39 | 31,373 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,451,836 |
| Asia Map Quiz | 0 | - | 4.99 | 924,309 |
| History of Iran | 0 | - | 4.66 | 16,415 |
| History of China | 0 | - | 4.35 | 57,529 |
| Countries of the Japanese Empire | 0 | - | 4.96 | 104,531 |
| History of India | 0 | - | 4.62 | 21,503 |
| Africa Map Quiz | 0 | - | 5.00 | 2,127,535 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,198 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,021 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,091 |
| Countries by Founding Story | 0 | - | 4.95 | 77,741 |
| Independence from Whom | 0 | - | 4.99 | 212,902 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,327 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,803 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.96 | 51,385 |
| Cultural Symbols of Australia | 0 | - | 4.24 | 48,062 |
| History of Mexico | 0 | - | 4.52 | 15,360 |
| United States Map Quiz | 0 | - | 4.98 | 4,169,962 |
| U.S. States by Governor | 0 | - | 4.43 | 18,110 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,760 |
| American Political Words | 0 | - | 4.39 | 23,465 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,764 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,660 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,596 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,267 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.42 | 24,056 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,903 |
| U.S. President Scramble | 0 | - | 4.40 | 117,413 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,329 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,069 |
| Events in U.S. History | 0 | - | 4.41 | 28,805 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,188 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,374 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 213,743 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,883 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,322 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,582 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,037 |
| Europe Geography Decoder | 0 | - | 4.86 | 70,276 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,962 |
| The Only European Country ... | 0 | - | 4.91 | 218,721 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,375 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,387 |
| French History Multiple Choice | 0 | - | 4.55 | 33,210 |
| History of Germany | 0 | - | 4.39 | 52,965 |
