| Prime Ministers of the UK | 0 | - | 4.95 | 438,045 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,689,969 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,118 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,660 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,853 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,093 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,163 |
| Country by Photo of its Leader | 0 | - | 4.72 | 123,897 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,443 |
| The Dictator Files: Saddam Hussein | 0 | - | 4.48 | 15,840 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,104 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,869 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,953 |
| Countries of the Popes | 0 | - | 4.79 | 127,919 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,018 |
| China by Picture | 0 | - | 4.51 | 63,080 |
| Cities of China (With Some Help) | 0 | - | 4.90 | 31,505 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,562 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,288 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,628 |
| Presidential Middle Names | 0 | - | 4.41 | 60,128 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,171 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,210 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,467 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,367 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,894 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,455 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,024 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,220 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,948 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,429 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,172 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,932 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,720 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,334 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,745 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,650 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,417 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,403 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,183 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,648 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,202 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,486 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,816 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,087 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,244 |
| First Ladies of the United States | 0 | - | 4.28 | 85,552 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,205 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,967 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,167 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,941 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,569 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,802 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,415 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,956 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,558 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,128 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,280 |
| Name the English Monarchs | 0 | - | 4.91 | 501,726 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,595 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,067 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 132,732 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,578 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,926 |
| Vietnam War Countries | 0 | - | 4.82 | 94,105 |
| China Cities Map Quiz | 0 | - | 4.93 | 104,979 |
| Countries that Border China | 0 | - | 4.96 | 262,903 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,344 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,056 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,490 |
| National Founders | 0 | - | 4.40 | 83,798 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,283 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,462 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,505 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,930 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,453 |
| The Trojan War | 0 | - | 4.83 | 39,660 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,337 |
| Name that Greek Letter | 0 | - | 4.93 | 323,154 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,586 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,437 |
| Roman Emperors | 0 | - | 4.95 | 119,714 |
| Pope Facts | 0 | - | 4.39 | 31,210 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,722 |
| Countries that Beat China | 0 | - | 4.86 | 115,536 |
| Biggest Cities in China | 0 | - | 4.52 | 158,266 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,360 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,605 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,716 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,623 |
| The John Adams Presidency | 0 | - | 4.12 | 8,737 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,730 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,837 |
| The American Revolution | 0 | - | 4.52 | 54,223 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,947 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,288 |
| History of Russia Quiz | 0 | - | 4.49 | 31,886 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,767 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,352 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,736 |
| Ancient Greek Words | 0 | - | 4.93 | 111,397 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,602 |
| History of Italy | 0 | - | 4.55 | 31,941 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,625 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,178 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,743 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,805 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,207 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,923 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,930 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,649 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,502 |
| All Cities in China with Population of 1 Million | 0 | - | 4.81 | 45,956 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,084 |
| Japan by Picture | 0 | - | 4.45 | 29,209 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,940 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,312 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,677 |
| The George Washington Presidency | 0 | - | 4.03 | 14,538 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,921 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,306 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,660 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,885 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,412 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,899 |
| Europe Map Quiz | 0 | - | 5.00 | 4,756,807 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,929 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 212,474 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,105 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,289 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,780 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,455 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,732 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,547 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 37,719 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,759 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 169,783 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,788 |
| Communist Countries in History | 0 | - | 4.63 | 495,037 |
| History of India | 0 | - | 4.61 | 21,404 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,396 |
| Africa Map Quiz | 0 | - | 5.00 | 2,115,199 |
| History of South Africa | 0 | - | 4.60 | 17,664 |
| Oceania Map Quiz | 0 | - | 4.98 | 640,879 |
| Australian Capitals | 0 | - | 4.92 | 62,700 |
| History of Mexico | 0 | - | 4.58 | 15,292 |
| United States Map Quiz | 0 | - | 4.98 | 4,154,602 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,933 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,067 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,766 |
| U.S. President Scramble | 0 | - | 4.40 | 116,671 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,154 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,849 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,160 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,024 |
| Official European Union Languages | 0 | - | 4.97 | 238,200 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,653 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,636 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,657 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,938 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,632 |
| History of Austria | 0 | - | 4.70 | 17,839 |
| Geography of the French Empire | 0 | - | 4.45 | 27,030 |
| The French Revolution | 0 | - | 4.46 | 23,911 |
| History of France | 0 | - | 4.59 | 56,860 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,464 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,342 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,951 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,883 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,525 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,268 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,043 |
| Byzantine History | 0 | - | 4.91 | 28,760 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,587 |
| History of The Netherlands | 0 | - | 4.46 | 17,412 |
| The Vikings! | 0 | - | 4.46 | 28,321 |
| The Portuguese Empire | 0 | - | 4.58 | 12,053 |
| Arthurian Legend | 0 | - | 4.33 | 25,099 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,311 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,333 |
| Geography of the British Empire | 0 | - | 4.48 | 39,637 |
| Medieval English History | 0 | - | 4.53 | 43,475 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,446,991 |
| Asia Map Quiz | 0 | - | 4.99 | 914,912 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,385 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,553 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,879 |
| History of Iran | 0 | - | 4.66 | 16,342 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,108 |
| Chinese Inventions | 0 | - | 4.30 | 33,786 |
| History of China | 0 | - | 4.37 | 57,073 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,629 |
| China Multiple Choice | 0 | - | 4.50 | 37,261 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,002 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,610 |
| Countries by Founding Story | 0 | - | 4.95 | 77,085 |
| Independence from Whom | 0 | - | 4.99 | 211,354 |
| Political Movements by Country | 0 | - | 4.46 | 72,473 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,736 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,391 |
