| Prime Ministers of the UK | 0 | - | 4.95 | 438,913 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,934 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,526 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,066 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,681 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 134,364 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,264 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,698,295 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,055 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,242 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,267 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,996 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,738 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,165 |
| National Founders | 0 | - | 4.40 | 83,837 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,430 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,561 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,002 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,129 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,447 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,784 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,297 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,212 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,729 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,660 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,987 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,869 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,807 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,807 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,252 |
| Japan by Picture | 0 | - | 4.45 | 29,236 |
| Political Movements by Country | 0 | - | 4.46 | 72,526 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,853 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,313 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,592 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,265 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,587 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,978 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,073 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,872 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,797 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,785 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,489 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,710 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,386 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,808 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,049 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,326 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,592 |
| Name the English Monarchs | 0 | - | 4.91 | 502,598 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,182 |
| Countries of the Popes | 0 | - | 4.79 | 128,103 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,702 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,221 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,678 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,661 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,947 |
| Countries that Border China | 0 | - | 4.96 | 263,140 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,434 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,142 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,630 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,403 |
| Hindu Countries | 0 | - | 4.86 | 50,142 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,563 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,531 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,493 |
| The Trojan War | 0 | - | 4.83 | 39,723 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,361 |
| Name that Greek Letter | 0 | - | 4.93 | 323,431 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,832 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,522 |
| Roman Emperors | 0 | - | 4.95 | 120,028 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,887 |
| China by Picture | 0 | - | 4.51 | 63,202 |
| Countries that Beat China | 0 | - | 4.85 | 115,811 |
| Biggest Cities in Japan | 0 | - | 4.69 | 83,078 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,014 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,437 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,309 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,719 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,480 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,790 |
| Presidential Middle Names | 0 | - | 4.41 | 60,241 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,331 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,594 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,985 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,432 |
| The American Revolution | 0 | - | 4.52 | 54,254 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 529,488 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,470 |
| History of Russia Quiz | 0 | - | 4.47 | 31,916 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,954 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,467 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,781 |
| Ancient Greek Words | 0 | - | 4.93 | 111,592 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,958 |
| History of Italy | 0 | - | 4.55 | 31,972 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,452 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,659 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,233 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,256 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,780 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,859 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,340 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,863 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,813 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,001 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,973 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,680 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,551 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,241 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,197 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,936 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,006 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,775 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 134,192 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,768 |
| Europe Map Quiz | 0 | - | 5.00 | 4,762,632 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,979 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 213,364 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,360 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,544 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,577 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 74,162 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,077 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,661 |
| Pope Facts | 0 | - | 4.39 | 31,241 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,136 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 169,990 |
| The Vietnam War | 0 | - | 4.44 | 35,525 |
| Communist Countries in History | 0 | - | 4.63 | 495,683 |
| History of India | 0 | - | 4.62 | 21,421 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,443 |
| Africa Map Quiz | 0 | - | 5.00 | 2,117,748 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,898 |
| History of South Africa | 0 | - | 4.60 | 17,688 |
| Oceania Map Quiz | 0 | - | 4.98 | 642,229 |
| Australian Capitals | 0 | - | 4.92 | 62,721 |
| History of Mexico | 0 | - | 4.58 | 15,309 |
| United States Map Quiz | 0 | - | 4.98 | 4,158,273 |
| American Political Words | 0 | - | 4.39 | 23,422 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,156 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,520 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,862 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,259 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,257 |
| First Ladies of the United States | 0 | - | 4.28 | 85,635 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,953 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,227 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 77,091 |
| U.S. President Scramble | 0 | - | 4.40 | 116,770 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,191 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,965 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,186 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,885 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,827 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,118 |
| Official European Union Languages | 0 | - | 4.97 | 238,494 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,834 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,160 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,713 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,017 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,734 |
| History of Austria | 0 | - | 4.70 | 17,861 |
| Geography of the French Empire | 0 | - | 4.45 | 27,059 |
| The French Revolution | 0 | - | 4.46 | 23,929 |
| History of France | 0 | - | 4.59 | 56,973 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,297 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,993 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,913 |
| Mythology A-Z | 0 | - | 4.31 | 37,217 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,932 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,151 |
| Byzantine History | 0 | - | 4.91 | 28,867 |
| Byzantine Emperors | 0 | - | 4.92 | 14,074 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,879 |
| History of The Netherlands | 0 | - | 4.46 | 17,431 |
| The Vikings! | 0 | - | 4.46 | 28,342 |
| The Portuguese Empire | 0 | - | 4.58 | 12,064 |
| Arthurian Legend | 0 | - | 4.33 | 25,109 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,350 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,462 |
| Geography of the British Empire | 0 | - | 4.48 | 39,671 |
| Medieval English History | 0 | - | 4.53 | 43,506 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,609 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,448,184 |
| Asia Map Quiz | 0 | - | 4.99 | 916,676 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,906 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,432 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,029 |
| History of Iran | 0 | - | 4.66 | 16,357 |
| The Iraq War | 0 | - | 4.47 | 15,655 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,128 |
| Vietnam War Countries | 0 | - | 4.82 | 94,218 |
| Chinese Inventions | 0 | - | 4.30 | 33,800 |
| History of China | 0 | - | 4.37 | 57,185 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,659 |
| China Multiple Choice | 0 | - | 4.50 | 37,281 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,193 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,703 |
