| Prime Ministers of the UK | 0 | - | 4.96 | 434,180 |
| Hindu Countries | 0 | - | 4.85 | 49,452 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,645 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,979 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,161 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,649,536 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,988 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,161 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,563 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,226 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,365 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,646 |
| National Founders | 0 | - | 4.40 | 83,623 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,328 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,379 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,555 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,194 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,641 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,614 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,804 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,311 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,262 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,005 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,925 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,616 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,486 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,575 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,823 |
| Political Movements by Country | 0 | - | 4.46 | 72,233 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,731 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,611 |
| Countries Bordering India | 0 | - | 4.98 | 162,546 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,135 |
| Countries Closest to India | 0 | - | 4.96 | 102,155 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,796 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,133 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,306 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,717 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,870 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,486 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,663 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,142 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,101 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,059 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,117 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,055 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,876 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,915 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,421 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,131 |
| Name the English Monarchs | 0 | - | 4.92 | 497,466 |
| Name the Popes Quiz | 0 | - | 4.47 | 136,973 |
| Countries of the Popes | 0 | - | 4.79 | 127,093 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,501 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,085 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,729 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,208 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,807 |
| Biggest Cities in India | 0 | - | 4.70 | 67,286 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,197 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,900 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,366 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,264 |
| The Trojan War | 0 | - | 4.83 | 39,400 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,302 |
| Name that Greek Letter | 0 | - | 4.94 | 321,458 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,378 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,985 |
| Roman Emperors | 0 | - | 4.95 | 118,320 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,147 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,128 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,647 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,344 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,012 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,895 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,961 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,756 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,858 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,376 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,923 |
| Presidential Middle Names | 0 | - | 4.41 | 59,644 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,678 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,756 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,711 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,145 |
| The American Revolution | 0 | - | 4.52 | 54,038 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,058 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,380 |
| History of Russia Quiz | 0 | - | 4.49 | 31,774 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,645 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,699 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,017 |
| Ancient Greek Words | 0 | - | 4.92 | 110,562 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,092 |
| History of Italy | 0 | - | 4.55 | 31,800 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,295 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,466 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,963 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,623 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,482 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,359 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,432 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,807 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,521 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,584 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,653 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,700 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,473 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,368 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,209 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,327 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,046 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,315 |
| Europe Map Quiz | 0 | - | 5.00 | 4,728,070 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,720 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,107 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,586 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,231 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,712 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,351 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,170 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,382 |
| Pope Facts | 0 | - | 4.39 | 31,017 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 276,967 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,618 |
| The Vietnam War | 0 | - | 4.43 | 35,278 |
| Communist Countries in History | 0 | - | 4.63 | 492,149 |
| History of India | 0 | - | 4.61 | 21,265 |
| Countries that Visit India the Most | 0 | - | 4.73 | 60,107 |
| Africa Map Quiz | 0 | - | 5.00 | 2,102,985 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,356 |
| History of South Africa | 0 | - | 4.60 | 17,592 |
| Oceania Map Quiz | 0 | - | 4.98 | 634,583 |
| Australian Capitals | 0 | - | 4.92 | 62,586 |
| History of Mexico | 0 | - | 4.58 | 15,218 |
| United States Map Quiz | 0 | - | 4.98 | 4,139,975 |
| American Political Words | 0 | - | 4.39 | 23,329 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,065 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,453 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,801 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,155 |
| First Ladies of the United States | 0 | - | 4.28 | 85,201 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,808 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,101 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,192 |
| U.S. President Scramble | 0 | - | 4.40 | 116,147 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,987 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,819 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,002 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,674 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,673 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,534 |
| Official European Union Languages | 0 | - | 4.97 | 236,377 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,614 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,915 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,389 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,489 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,191 |
| History of Austria | 0 | - | 4.70 | 17,738 |
| Geography of the French Empire | 0 | - | 4.48 | 26,915 |
| The French Revolution | 0 | - | 4.46 | 23,752 |
| History of France | 0 | - | 4.59 | 55,905 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,372 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,903 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,743 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,756 |
| Mythology A-Z | 0 | - | 4.31 | 36,965 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,709 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,688 |
| Byzantine History | 0 | - | 4.91 | 28,587 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,368 |
| History of The Netherlands | 0 | - | 4.46 | 17,299 |
| The Vikings! | 0 | - | 4.45 | 28,236 |
| The Portuguese Empire | 0 | - | 4.54 | 11,981 |
| Arthurian Legend | 0 | - | 4.33 | 25,046 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,154 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,711 |
| Geography of the British Empire | 0 | - | 4.48 | 39,464 |
| Medieval English History | 0 | - | 4.53 | 43,294 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,539 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,438,388 |
| Asia Map Quiz | 0 | - | 4.99 | 906,046 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,777 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,149 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,178 |
| History of Iran | 0 | - | 4.65 | 16,259 |
| The Iraq War | 0 | - | 4.47 | 15,540 |
| Ottoman Empire Quiz | 0 | - | 4.46 | 17,002 |
| Vietnam War Countries | 0 | - | 4.83 | 93,542 |
| Chinese Inventions | 0 | - | 4.30 | 33,712 |
| History of China | 0 | - | 4.37 | 56,648 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,611 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,098 |
| Countries by Founding Story | 0 | - | 4.95 | 76,460 |
| Independence from Whom | 0 | - | 4.99 | 209,514 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,600 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,945 |
| India A-Z | 0 | - | 4.42 | 33,901 |
| Countries that Beat India | 0 | - | 4.41 | 62,552 |
| Countries of Africa | 0 | - | 5.00 | 2,505,049 |
