| Prime Ministers of the UK | 0 | - | 4.96 | 436,317 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,769 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,243 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,022 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,611 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 118,779 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,925 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,191 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,562 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,917 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,771 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,643 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,340 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,823 |
| National Founders | 0 | - | 4.40 | 83,719 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,775 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,240 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,718 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,807 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,745 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,564 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,898 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,441 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,789 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,894 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,428 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,314 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,703 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,523 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,012 |
| Japan by Picture | 0 | - | 4.45 | 29,136 |
| Political Movements by Country | 0 | - | 4.46 | 72,368 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,250 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,987 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,118 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,462 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,702 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,828 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,958 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,652 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,695 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,670 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,276 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,685 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,954 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,366 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,401 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,120 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,754 |
| Name the English Monarchs | 0 | - | 4.92 | 499,746 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,509 |
| Countries of the Popes | 0 | - | 4.79 | 127,545 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,949 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,629 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,170 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,416 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,865 |
| Countries that Border China | 0 | - | 4.96 | 262,388 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,137 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 59,876 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,179 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,041 |
| Hindu Countries | 0 | - | 4.86 | 49,792 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,181 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,414 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,378 |
| The Trojan War | 0 | - | 4.83 | 39,541 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,178 |
| Name that Greek Letter | 0 | - | 4.93 | 322,394 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,072 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,243 |
| Roman Emperors | 0 | - | 4.95 | 119,079 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,463 |
| China by Picture | 0 | - | 4.51 | 62,814 |
| Countries that Beat China | 0 | - | 4.86 | 115,122 |
| Biggest Cities in Japan | 0 | - | 4.69 | 82,726 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,588 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 54,158 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,092 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,217 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,863 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,287 |
| Presidential Middle Names | 0 | - | 4.41 | 59,892 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,941 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,140 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,840 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,256 |
| The American Revolution | 0 | - | 4.52 | 54,132 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,447 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,856 |
| History of Russia Quiz | 0 | - | 4.49 | 31,832 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,809 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,037 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,016 |
| Ancient Greek Words | 0 | - | 4.93 | 111,038 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,963 |
| History of Italy | 0 | - | 4.55 | 31,886 |
| 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 | 77,074 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,900 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,615 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,695 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,830 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,279 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,625 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,744 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,833 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,159 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,376 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,794 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,263 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,064 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,636 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,375 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,144 |
| Europe Map Quiz | 0 | - | 5.00 | 4,743,318 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,830 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 210,783 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,577 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,810 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,164 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,050 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,893 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,446 |
| Pope Facts | 0 | - | 4.39 | 31,123 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,050 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 169,227 |
| The Vietnam War | 0 | - | 4.43 | 35,381 |
| Communist Countries in History | 0 | - | 4.63 | 493,676 |
| History of India | 0 | - | 4.61 | 21,332 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,283 |
| Africa Map Quiz | 0 | - | 5.00 | 2,109,731 |
| 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 | 637,994 |
| Australian Capitals | 0 | - | 4.92 | 62,646 |
| History of Mexico | 0 | - | 4.58 | 15,253 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,341 |
| American Political Words | 0 | - | 4.39 | 23,374 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,108 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,484 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,829 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,556 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,191 |
| First Ladies of the United States | 0 | - | 4.28 | 85,353 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,856 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,152 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,631 |
| U.S. President Scramble | 0 | - | 4.40 | 116,425 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,070 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,875 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,075 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,764 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,726 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,814 |
| Official European Union Languages | 0 | - | 4.97 | 237,543 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,244 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 426,315 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,536 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,752 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,432 |
| History of Austria | 0 | - | 4.70 | 17,793 |
| Geography of the French Empire | 0 | - | 4.45 | 26,986 |
| The French Revolution | 0 | - | 4.46 | 23,851 |
| History of France | 0 | - | 4.59 | 56,529 |
| 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 | 31,826 |
| Mythology A-Z | 0 | - | 4.31 | 37,086 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,707 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,873 |
| Byzantine History | 0 | - | 4.91 | 28,686 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,959 |
| 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 | 122,060 |
| 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 | 1,443,539 |
| Asia Map Quiz | 0 | - | 4.99 | 910,250 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,837 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,288 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,548 |
| History of Iran | 0 | - | 4.66 | 16,298 |
| 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 | 56,884 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,555 |
| China Multiple Choice | 0 | - | 4.50 | 37,207 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,482 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,389 |
| Countries by Founding Story | 0 | - | 4.95 | 76,818 |
