| Prime Ministers of the UK | 0 | - | 4.95 | 438,298 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,899 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,462 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,692,153 |
| Country by Photo of its Leader | 0 | - | 4.72 | 123,957 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,505 |
| Australia Map Quiz | 0 | - | 4.95 | 344,126 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,898 |
| National Founders | 0 | - | 4.40 | 83,811 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,145 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,927 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,059 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,276 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,054 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,666 |
| Australia Cities Map Quiz | 0 | - | 4.83 | 145,305 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,287 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,528 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,205 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,020 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 79,876 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,448 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,822 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,726 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,779 |
| Political Movements by Country | 0 | - | 4.46 | 72,492 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,711 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,521 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,477 |
| Most Visited Countries by Australians | 0 | - | 4.95 | 90,535 |
| Countries that Visit Australia the Most | 0 | - | 4.92 | 69,009 |
| Countries Closest to Australia | 0 | - | 4.99 | 166,850 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,950 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,835 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,440 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,186 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,282 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,389 |
| Name the English Monarchs | 0 | - | 4.91 | 501,963 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,006 |
| Countries of the Popes | 0 | - | 4.79 | 127,985 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,117 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.88 | 133,492 |
| Hindu Countries | 0 | - | 4.86 | 50,068 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,200 |
| Australia A-Z | 0 | - | 4.54 | 49,951 |
| Countries that Beat Australia | 0 | - | 4.92 | 92,684 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,067 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,515 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,776 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,636 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,582 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,755 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,915 |
| The Trojan War | 0 | - | 4.83 | 39,674 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,636 |
| Name that Greek Letter | 0 | - | 4.93 | 323,250 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,661 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,464 |
| Roman Emperors | 0 | - | 4.95 | 119,786 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,008 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,699 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,174 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,935 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,387 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,598 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,347 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,682 |
| Presidential Middle Names | 0 | - | 4.41 | 60,165 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,243 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,514 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,387 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,129 |
| History of Russia Quiz | 0 | - | 4.47 | 31,899 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,460 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,926 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,392 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,230 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,722 |
| History of Italy | 0 | - | 4.55 | 31,955 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,636 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,196 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,758 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,824 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,251 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,680 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,932 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,116 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,010 |
| Famous Australians by Picture | 0 | - | 4.25 | 28,764 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,273 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,764 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,956 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,921 |
| The American Revolution | 0 | - | 4.52 | 54,229 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,544 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,998 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,695 |
| Europe Map Quiz | 0 | - | 5.00 | 4,758,542 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,942 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,343 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 212,661 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,851 |
| Ancient Greek Words | 0 | - | 4.93 | 111,451 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,428 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,185 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,732 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,632 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,772 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,850 |
| The Vietnam War | 0 | - | 4.44 | 35,500 |
| Communist Countries in History | 0 | - | 4.63 | 495,222 |
| History of India | 0 | - | 4.62 | 21,409 |
| Africa Map Quiz | 0 | - | 5.00 | 2,115,990 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,846 |
| History of South Africa | 0 | - | 4.60 | 17,673 |
| Oceania Map Quiz | 0 | - | 4.98 | 641,297 |
| Australian Capitals | 0 | - | 4.92 | 62,709 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,141 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,510 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,855 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,149 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,247 |
| First Ladies of the United States | 0 | - | 4.28 | 85,584 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,212 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 77,001 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,173 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,944 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,812 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,053 |
| Official European Union Languages | 0 | - | 4.97 | 238,291 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,717 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,821 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,197 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,382 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,485 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,663 |
| History of Austria | 0 | - | 4.70 | 17,849 |
| Geography of the French Empire | 0 | - | 4.45 | 27,040 |
| The French Revolution | 0 | - | 4.46 | 23,920 |
| History of France | 0 | - | 4.59 | 56,910 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,258 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,640 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,646 |
| The Vikings! | 0 | - | 4.46 | 28,333 |
| The Portuguese Empire | 0 | - | 4.58 | 12,056 |
| Arthurian Legend | 0 | - | 4.33 | 25,102 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,318 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,380 |
| Geography of the British Empire | 0 | - | 4.48 | 39,643 |
| Pope Facts | 0 | - | 4.39 | 31,221 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,447,473 |
| Asia Map Quiz | 0 | - | 4.99 | 915,540 |
| History of Iran | 0 | - | 4.66 | 16,348 |
| History of China | 0 | - | 4.37 | 57,117 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,200 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,060 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,643 |
| Countries by Founding Story | 0 | - | 4.95 | 77,119 |
| Independence from Whom | 0 | - | 4.99 | 211,470 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,816 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,418 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,419 |
| Countries of Africa | 0 | - | 5.00 | 2,532,869 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,721 |
| African East Coast | 0 | - | 4.96 | 95,928 |
| Western Africa Map Quiz | 0 | - | 4.97 | 73,744 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,568 |
| Cultural Symbols of Australia | 0 | - | 4.24 | 47,967 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,586 |
| History of Mexico | 0 | - | 4.58 | 15,299 |
| United States Map Quiz | 0 | - | 4.98 | 4,155,419 |
| U.S. States by Governor | 0 | - | 4.43 | 18,054 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,680 |
| American Political Words | 0 | - | 4.39 | 23,405 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,658 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,300 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,484 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,181 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,939 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,649 |
| U.S. President Scramble | 0 | - | 4.40 | 116,703 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,164 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,859 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,099 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,989 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 211,965 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,615 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,195 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,733 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,185 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,928 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,001 |
| The Only European Country ... | 0 | - | 4.91 | 216,263 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,926 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,962 |
| French History Multiple Choice | 0 | - | 4.55 | 33,013 |
| History of Germany | 0 | - | 4.39 | 52,793 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,962 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,890 |
