| Prime Ministers of the UK | 0 | - | 4.95 | 442,990 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,220 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,984 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,142 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,766 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,654 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,730,052 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,811 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,732 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,913 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,088 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,650 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,264 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,572 |
| National Founders | 0 | - | 4.40 | 83,997 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,806 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,837 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,504 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,583 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,944 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,975 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,944 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,520 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,926 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,961 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,987 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,699 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,959 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,760 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,670 |
| Japan by Picture | 0 | - | 4.45 | 29,447 |
| Political Movements by Country | 0 | - | 4.46 | 72,813 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,172 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,155 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,142 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,873 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,936 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,803 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,385 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,930 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,395 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,231 |
| Countries Italy Declared War On | 0 | - | 4.74 | 47,866 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,987 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,999 |
| Name the English Monarchs | 0 | - | 4.91 | 507,212 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,067 |
| Countries of the Popes | 0 | - | 4.79 | 128,860 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,693 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,104 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,730 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,095 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,080 |
| Countries that Border China | 0 | - | 4.96 | 264,482 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,928 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,610 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,290 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,673 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,811 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,188 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,120 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,459 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,078 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,612 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,681 |
| The Trojan War | 0 | - | 4.83 | 40,039 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,727 |
| Name that Greek Letter | 0 | - | 4.93 | 325,197 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,133 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,668 |
| Roman Emperors | 0 | - | 4.95 | 121,382 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,624 |
| China by Picture | 0 | - | 4.51 | 63,821 |
| Countries that Beat China | 0 | - | 4.85 | 116,917 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,822 |
| Biggest Cities in Japan | 0 | - | 4.68 | 83,586 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,351 |
| Hindu Countries | 0 | - | 4.86 | 50,653 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,592 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,641 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,439 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,734 |
| Presidential Middle Names | 0 | - | 4.42 | 60,791 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,733 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,930 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,241 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,653 |
| The American Revolution | 0 | - | 4.52 | 54,380 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,928 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,513 |
| History of Russia Quiz | 0 | - | 4.47 | 32,019 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,206 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,096 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,272 |
| Ancient Greek Words | 0 | - | 4.93 | 112,623 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,805 |
| History of Italy | 0 | - | 4.55 | 32,178 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,588 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,841 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,462 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,916 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,021 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,138 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,063 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,146 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,084 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,320 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,164 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,517 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,209 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,659 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,818 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,371 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,645 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,682 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,765 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,202 |
| Europe Map Quiz | 0 | - | 5.00 | 4,792,223 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,227 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,294 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,610 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,680 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,680 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,557 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,267 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,842 |
| Pope Facts | 0 | - | 4.39 | 31,418 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 280,940 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,155 |
| The Vietnam War | 0 | - | 4.44 | 35,684 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,607 |
| Communist Countries in History | 0 | - | 4.63 | 498,649 |
| History of South Africa | 0 | - | 4.60 | 17,777 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,138 |
| Australian Capitals | 0 | - | 4.92 | 62,858 |
| History of Mexico | 0 | - | 4.52 | 15,372 |
| United States Map Quiz | 0 | - | 4.98 | 4,173,136 |
| American Political Words | 0 | - | 4.39 | 23,486 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,221 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,571 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,909 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,144 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,378 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,793 |
| First Ladies of the United States | 0 | - | 4.28 | 86,016 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,331 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,518 |
| U.S. President Scramble | 0 | - | 4.40 | 117,535 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,383 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,116 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,370 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 59,511 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,108 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,960 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,832 |
| Official European Union Languages | 0 | - | 4.97 | 240,184 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,780 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,296 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,969 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,482 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,220 |
| History of Austria | 0 | - | 4.70 | 17,991 |
| Geography of the French Empire | 0 | - | 4.45 | 27,229 |
| The French Revolution | 0 | - | 4.47 | 24,164 |
| History of France | 0 | - | 4.61 | 57,707 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,573 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,652 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,275 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,068 |
| Mythology A-Z | 0 | - | 4.31 | 37,435 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,003 |
| Figures from Greek Mythology | 0 | - | 4.91 | 189,146 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,535 |
| Byzantine History | 0 | - | 4.91 | 29,037 |
| Byzantine Emperors | 0 | - | 4.93 | 14,650 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,112 |
| History of The Netherlands | 0 | - | 4.46 | 17,570 |
| The Vikings! | 0 | - | 4.46 | 28,419 |
| The Portuguese Empire | 0 | - | 4.58 | 12,116 |
| Arthurian Legend | 0 | - | 4.33 | 25,186 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,486 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,349 |
| Geography of the British Empire | 0 | - | 4.48 | 39,866 |
| Medieval English History | 0 | - | 4.53 | 43,681 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,655 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,232 |
| Asia Map Quiz | 0 | - | 4.99 | 926,425 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,049 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,688 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,684 |
| History of Iran | 0 | - | 4.66 | 16,437 |
| The Iraq War | 0 | - | 4.47 | 15,713 |
| Vietnam War Countries | 0 | - | 4.82 | 94,729 |
| Chinese Inventions | 0 | - | 4.30 | 33,872 |
| History of China | 0 | - | 4.35 | 57,657 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,810 |
| China Multiple Choice | 0 | - | 4.50 | 37,433 |
| History of India | 0 | - | 4.62 | 21,524 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,698 |
| Africa Map Quiz | 0 | - | 5.00 | 2,130,413 |
