| Prime Ministers of the UK | 0 | - | 4.96 | 436,354 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,770 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,249 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,023 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,611 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 118,873 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,931 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,766 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,575 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,920 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,782 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,643 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,347 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,827 |
| National Founders | 0 | - | 4.40 | 83,721 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,848 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,265 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,721 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,809 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,756 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,594 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,905 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,471 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,799 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,906 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,444 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,319 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,706 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,548 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,019 |
| Japan by Picture | 0 | - | 4.45 | 29,139 |
| Political Movements by Country | 0 | - | 4.46 | 72,368 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,259 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,991 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,128 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,473 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,713 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,833 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,958 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,657 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,695 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,684 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,281 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,700 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,973 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,371 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,414 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,122 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,762 |
| Name the English Monarchs | 0 | - | 4.92 | 499,817 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,517 |
| Countries of the Popes | 0 | - | 4.79 | 127,550 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,954 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,637 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,173 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,420 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,866 |
| Countries that Border China | 0 | - | 4.96 | 262,410 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,145 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 59,881 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,185 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,051 |
| Hindu Countries | 0 | - | 4.86 | 49,797 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,189 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,416 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,381 |
| The Trojan War | 0 | - | 4.83 | 39,543 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,231 |
| Name that Greek Letter | 0 | - | 4.93 | 322,421 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,091 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,249 |
| Roman Emperors | 0 | - | 4.95 | 119,136 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,469 |
| China by Picture | 0 | - | 4.51 | 62,829 |
| Countries that Beat China | 0 | - | 4.86 | 115,136 |
| Biggest Cities in Japan | 0 | - | 4.69 | 82,728 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,592 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 54,162 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,100 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,223 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,876 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,292 |
| Presidential Middle Names | 0 | - | 4.41 | 59,899 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,954 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,165 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,843 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,264 |
| The American Revolution | 0 | - | 4.52 | 54,134 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,537 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,866 |
| History of Russia Quiz | 0 | - | 4.49 | 31,834 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,813 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,048 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,076 |
| Ancient Greek Words | 0 | - | 4.93 | 111,047 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,982 |
| History of Italy | 0 | - | 4.55 | 31,888 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,370 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,550 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,077 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,910 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,616 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,697 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,837 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,290 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,626 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,750 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,835 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,168 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,376 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,799 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,286 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,079 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,645 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,409 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,164 |
| Europe Map Quiz | 0 | - | 5.00 | 4,743,730 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,832 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 210,831 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,589 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,825 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,169 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,063 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,936 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,446 |
| Pope Facts | 0 | - | 4.39 | 31,124 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,063 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 169,252 |
| The Vietnam War | 0 | - | 4.43 | 35,383 |
| Communist Countries in History | 0 | - | 4.63 | 493,699 |
| History of India | 0 | - | 4.61 | 21,333 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,287 |
| Africa Map Quiz | 0 | - | 5.00 | 2,109,848 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,603 |
| History of South Africa | 0 | - | 4.60 | 17,633 |
| Oceania Map Quiz | 0 | - | 4.98 | 638,072 |
| Australian Capitals | 0 | - | 4.92 | 62,646 |
| History of Mexico | 0 | - | 4.58 | 15,254 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,484 |
| American Political Words | 0 | - | 4.39 | 23,374 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,110 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,486 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,830 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,575 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,193 |
| First Ladies of the United States | 0 | - | 4.28 | 85,354 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,860 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,154 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,643 |
| U.S. President Scramble | 0 | - | 4.40 | 116,431 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,073 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,877 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,076 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,766 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,728 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,822 |
| Official European Union Languages | 0 | - | 4.97 | 237,565 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,259 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,369 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,539 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,755 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,437 |
| History of Austria | 0 | - | 4.70 | 17,793 |
| Geography of the French Empire | 0 | - | 4.45 | 26,987 |
| The French Revolution | 0 | - | 4.46 | 23,853 |
| History of France | 0 | - | 4.59 | 56,545 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,421 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,078 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,858 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,830 |
| Mythology A-Z | 0 | - | 4.31 | 37,089 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,731 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,877 |
| Byzantine History | 0 | - | 4.91 | 28,689 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,980 |
| History of The Netherlands | 0 | - | 4.46 | 17,352 |
| The Vikings! | 0 | - | 4.46 | 28,281 |
| The Portuguese Empire | 0 | - | 4.58 | 12,025 |
| Arthurian Legend | 0 | - | 4.33 | 25,073 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,257 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,065 |
| Geography of the British Empire | 0 | - | 4.48 | 39,567 |
| Medieval English History | 0 | - | 4.53 | 43,383 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,576 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,632 |
| Asia Map Quiz | 0 | - | 4.99 | 910,345 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,838 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,289 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,558 |
| History of Iran | 0 | - | 4.66 | 16,299 |
| The Iraq War | 0 | - | 4.47 | 15,587 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,069 |
| Vietnam War Countries | 0 | - | 4.83 | 93,859 |
| Chinese Inventions | 0 | - | 4.30 | 33,749 |
| History of China | 0 | - | 4.37 | 56,889 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,557 |
| China Multiple Choice | 0 | - | 4.50 | 37,208 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,492 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,391 |
| Countries by Founding Story | 0 | - | 4.95 | 76,823 |
