| Prime Ministers of the UK | 0 | - | 4.96 | 436,332 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,770 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,247 |
| 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 | 118,816 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,927 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,468 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,565 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,918 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,777 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,643 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,345 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,826 |
| National Founders | 0 | - | 4.40 | 83,719 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,800 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,248 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,721 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,807 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,749 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,579 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,901 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,449 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,791 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,901 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,433 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,319 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,703 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,531 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,014 |
| Japan by Picture | 0 | - | 4.45 | 29,137 |
| Political Movements by Country | 0 | - | 4.46 | 72,368 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,252 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,990 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,120 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,467 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,705 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,829 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,958 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,653 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,695 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,679 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,279 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,692 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,964 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,369 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,409 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,120 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,757 |
| Name the English Monarchs | 0 | - | 4.92 | 499,772 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,510 |
| Countries of the Popes | 0 | - | 4.79 | 127,547 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,950 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,632 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,170 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,418 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,866 |
| Countries that Border China | 0 | - | 4.96 | 262,399 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,139 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 59,879 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,181 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,045 |
| Hindu Countries | 0 | - | 4.86 | 49,795 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,185 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,415 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,378 |
| The Trojan War | 0 | - | 4.83 | 39,542 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,203 |
| Name that Greek Letter | 0 | - | 4.93 | 322,399 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,081 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,245 |
| Roman Emperors | 0 | - | 4.95 | 119,089 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,467 |
| China by Picture | 0 | - | 4.51 | 62,822 |
| Countries that Beat China | 0 | - | 4.86 | 115,130 |
| Biggest Cities in Japan | 0 | - | 4.69 | 82,726 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,589 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 54,160 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,095 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,220 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,870 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,290 |
| Presidential Middle Names | 0 | - | 4.41 | 59,896 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,949 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,152 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,841 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,260 |
| The American Revolution | 0 | - | 4.52 | 54,134 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,473 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,861 |
| History of Russia Quiz | 0 | - | 4.49 | 31,833 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,811 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,044 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,037 |
| Ancient Greek Words | 0 | - | 4.93 | 111,042 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,969 |
| History of Italy | 0 | - | 4.55 | 31,888 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,369 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,549 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,076 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,906 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,616 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,696 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,832 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,284 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,626 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,748 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,834 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,163 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,376 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,797 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,269 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,071 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,640 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,392 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,152 |
| Europe Map Quiz | 0 | - | 5.00 | 4,743,508 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,830 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 210,806 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,584 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,818 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,165 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,056 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,918 |
| 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 | 278,058 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 169,234 |
| The Vietnam War | 0 | - | 4.43 | 35,381 |
| Communist Countries in History | 0 | - | 4.63 | 493,686 |
| History of India | 0 | - | 4.61 | 21,332 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,285 |
| Africa Map Quiz | 0 | - | 5.00 | 2,109,768 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,600 |
| History of South Africa | 0 | - | 4.60 | 17,632 |
| Oceania Map Quiz | 0 | - | 4.98 | 638,029 |
| Australian Capitals | 0 | - | 4.92 | 62,646 |
| History of Mexico | 0 | - | 4.58 | 15,254 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,390 |
| American Political Words | 0 | - | 4.39 | 23,374 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,109 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,486 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,829 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,565 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,192 |
| First Ladies of the United States | 0 | - | 4.28 | 85,353 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,858 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,153 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,641 |
| U.S. President Scramble | 0 | - | 4.40 | 116,428 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,072 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,876 |
| 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 | 12,726 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,819 |
| Official European Union Languages | 0 | - | 4.97 | 237,553 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,251 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,332 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,537 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,753 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,434 |
| History of Austria | 0 | - | 4.70 | 17,793 |
| Geography of the French Empire | 0 | - | 4.45 | 26,986 |
| The French Revolution | 0 | - | 4.46 | 23,852 |
| History of France | 0 | - | 4.59 | 56,535 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,421 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,074 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,858 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,827 |
| Mythology A-Z | 0 | - | 4.31 | 37,089 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,713 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,875 |
| Byzantine History | 0 | - | 4.91 | 28,687 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,968 |
| History of The Netherlands | 0 | - | 4.46 | 17,352 |
| The Vikings! | 0 | - | 4.46 | 28,280 |
| The Portuguese Empire | 0 | - | 4.58 | 12,025 |
| Arthurian Legend | 0 | - | 4.33 | 25,072 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,257 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,061 |
| Geography of the British Empire | 0 | - | 4.48 | 39,567 |
| Medieval English History | 0 | - | 4.53 | 43,382 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,576 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,585 |
| Asia Map Quiz | 0 | - | 4.99 | 910,301 |
| 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 | 118,551 |
| History of Iran | 0 | - | 4.66 | 16,299 |
| The Iraq War | 0 | - | 4.47 | 15,587 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,068 |
| Vietnam War Countries | 0 | - | 4.83 | 93,856 |
| Chinese Inventions | 0 | - | 4.30 | 33,749 |
| History of China | 0 | - | 4.37 | 56,886 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,556 |
| China Multiple Choice | 0 | - | 4.50 | 37,208 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,486 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,390 |
| Countries by Founding Story | 0 | - | 4.95 | 76,818 |
