| Prime Ministers of the UK | 0 | - | 4.95 | 442,976 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,220 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,982 |
| 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 | 137,646 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,729,922 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,809 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,729 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,911 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,084 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,645 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,263 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,572 |
| National Founders | 0 | - | 4.40 | 83,996 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,796 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,823 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,503 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,576 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,941 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,972 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,938 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,519 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,919 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,958 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,981 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,698 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,959 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,747 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,669 |
| Japan by Picture | 0 | - | 4.45 | 29,446 |
| Political Movements by Country | 0 | - | 4.46 | 72,812 |
| 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 | 191,934 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,802 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,379 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,925 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,392 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,226 |
| Countries Italy Declared War On | 0 | - | 4.74 | 47,833 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,982 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,993 |
| Name the English Monarchs | 0 | - | 4.91 | 507,199 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,063 |
| Countries of the Popes | 0 | - | 4.79 | 128,855 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,692 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,100 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,729 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,094 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,080 |
| Countries that Border China | 0 | - | 4.96 | 264,476 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,925 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,607 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,288 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,670 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,811 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,186 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,116 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,456 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,078 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,610 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,681 |
| The Trojan War | 0 | - | 4.83 | 40,038 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,695 |
| Name that Greek Letter | 0 | - | 4.93 | 325,191 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,129 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,668 |
| Roman Emperors | 0 | - | 4.95 | 121,378 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,623 |
| China by Picture | 0 | - | 4.51 | 63,815 |
| Countries that Beat China | 0 | - | 4.85 | 116,910 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,821 |
| Biggest Cities in Japan | 0 | - | 4.68 | 83,586 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,347 |
| Hindu Countries | 0 | - | 4.86 | 50,653 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,591 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,638 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,437 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,731 |
| Presidential Middle Names | 0 | - | 4.42 | 60,790 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,731 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,930 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,240 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,650 |
| The American Revolution | 0 | - | 4.52 | 54,379 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,921 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,507 |
| History of Russia Quiz | 0 | - | 4.47 | 32,019 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,203 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,094 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,255 |
| Ancient Greek Words | 0 | - | 4.93 | 112,620 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,797 |
| History of Italy | 0 | - | 4.55 | 32,175 |
| 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 | 54,020 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,135 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,062 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,139 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,083 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,319 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,164 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,514 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,209 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,658 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,814 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,367 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,643 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,668 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,754 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,200 |
| Europe Map Quiz | 0 | - | 5.00 | 4,792,120 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,225 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,274 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,604 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,679 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,674 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,550 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,257 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,841 |
| Pope Facts | 0 | - | 4.39 | 31,415 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 280,936 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,151 |
| The Vietnam War | 0 | - | 4.44 | 35,684 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,603 |
| Communist Countries in History | 0 | - | 4.63 | 498,637 |
| History of South Africa | 0 | - | 4.60 | 17,777 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,110 |
| Australian Capitals | 0 | - | 4.92 | 62,856 |
| History of Mexico | 0 | - | 4.52 | 15,372 |
| United States Map Quiz | 0 | - | 4.98 | 4,173,074 |
| American Political Words | 0 | - | 4.39 | 23,486 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,220 |
| 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 | 137,136 |
| 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 | 86,014 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,330 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,517 |
| U.S. President Scramble | 0 | - | 4.40 | 117,534 |
| 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 | 23,368 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 59,498 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,107 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,959 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,831 |
| Official European Union Languages | 0 | - | 4.97 | 240,170 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,779 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,281 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,968 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,481 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,217 |
| History of Austria | 0 | - | 4.70 | 17,990 |
| Geography of the French Empire | 0 | - | 4.45 | 27,229 |
| The French Revolution | 0 | - | 4.47 | 24,164 |
| History of France | 0 | - | 4.61 | 57,703 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,573 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,651 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,272 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,067 |
| Mythology A-Z | 0 | - | 4.31 | 37,435 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,002 |
| Figures from Greek Mythology | 0 | - | 4.91 | 189,139 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,534 |
| Byzantine History | 0 | - | 4.91 | 29,037 |
| Byzantine Emperors | 0 | - | 4.93 | 14,649 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,108 |
| 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 | 123,347 |
| Geography of the British Empire | 0 | - | 4.48 | 39,866 |
| Medieval English History | 0 | - | 4.53 | 43,679 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,655 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,212 |
| Asia Map Quiz | 0 | - | 4.99 | 926,390 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,049 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,687 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,683 |
| History of Iran | 0 | - | 4.66 | 16,437 |
| The Iraq War | 0 | - | 4.47 | 15,713 |
| Vietnam War Countries | 0 | - | 4.82 | 94,728 |
| Chinese Inventions | 0 | - | 4.30 | 33,872 |
| History of China | 0 | - | 4.35 | 57,656 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,809 |
| China Multiple Choice | 0 | - | 4.50 | 37,432 |
| History of India | 0 | - | 4.62 | 21,524 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,697 |
| Africa Map Quiz | 0 | - | 5.00 | 2,130,371 |
