| Prime Ministers of the UK | 0 | - | 4.95 | 441,484 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,719,383 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,752 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,731 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,155 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,425 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,586 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,498 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,818 |
| The Dictator Files: Saddam Hussein | 0 | - | 4.48 | 15,912 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,734 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,796 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,419 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,746 |
| Countries of the Popes | 0 | - | 4.79 | 128,569 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,163 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,022 |
| China by Picture | 0 | - | 4.51 | 63,577 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,211 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,115 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,458 |
| Presidential Middle Names | 0 | - | 4.41 | 60,619 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,192 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,575 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,827 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,589 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.44 | 51,026 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,346 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,134 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,417 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,622 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,159 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,395 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,760 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,106 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,753 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,519 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,649 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,404 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,545 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,071 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,488 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,052 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,799 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,342 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,732 |
| First Ladies of the United States | 0 | - | 4.28 | 85,876 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,287 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,395 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,322 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,071 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,583 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,697 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,522 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,274 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,730 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,482 |
| Name the English Monarchs | 0 | - | 4.91 | 505,516 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,173 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,782 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,640 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,971 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,042 |
| Vietnam War Countries | 0 | - | 4.82 | 94,512 |
| China Cities Map Quiz | 0 | - | 4.94 | 105,734 |
| Countries that Border China | 0 | - | 4.96 | 264,005 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,727 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,433 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,063 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,349 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,625 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,967 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,920 |
| National Founders | 0 | - | 4.40 | 83,935 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,890 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,582 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,037 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,614 |
| The Trojan War | 0 | - | 4.83 | 39,936 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,807 |
| Name that Greek Letter | 0 | - | 4.93 | 324,708 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,698 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,498 |
| Roman Emperors | 0 | - | 4.95 | 120,925 |
| Pope Facts | 0 | - | 4.39 | 31,349 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,391 |
| Countries that Beat China | 0 | - | 4.85 | 116,537 |
| Biggest Cities in China | 0 | - | 4.53 | 159,572 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,129 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,767 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,730 |
| The John Adams Presidency | 0 | - | 4.12 | 8,777 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,765 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,902 |
| The American Revolution | 0 | - | 4.52 | 54,326 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,800 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,093 |
| History of Russia Quiz | 0 | - | 4.47 | 31,987 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,910 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,870 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,063 |
| Ancient Greek Words | 0 | - | 4.93 | 112,270 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,171 |
| History of Italy | 0 | - | 4.55 | 32,113 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,785 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,387 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,929 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,048 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,793 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,203 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,102 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,093 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,252 |
| All Cities in China with Population of 1 Million | 0 | - | 4.82 | 46,457 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,970 |
| Japan by Picture | 0 | - | 4.45 | 29,379 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,677 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,381 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,954 |
| The George Washington Presidency | 0 | - | 4.03 | 14,592 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,973 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,367 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,743 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,467 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,074 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,316 |
| Europe Map Quiz | 0 | - | 5.00 | 4,781,273 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,138 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 215,968 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,122 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,217 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,526 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,406 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 75,003 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,788 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,109 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,333 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,714 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,892 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,061 |
| Communist Countries in History | 0 | - | 4.63 | 497,545 |
| History of South Africa | 0 | - | 4.60 | 17,743 |
| Oceania Map Quiz | 0 | - | 4.98 | 658,050 |
| Australian Capitals | 0 | - | 4.92 | 62,806 |
| History of Mexico | 0 | - | 4.52 | 15,357 |
| United States Map Quiz | 0 | - | 4.98 | 4,168,119 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,103 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,132 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,853 |
| U.S. President Scramble | 0 | - | 4.40 | 117,355 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,306 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,049 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,544 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,590 |
| Official European Union Languages | 0 | - | 4.97 | 239,468 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,475 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,273 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,875 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,326 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,042 |
| History of Austria | 0 | - | 4.70 | 17,955 |
| Geography of the French Empire | 0 | - | 4.45 | 27,198 |
| The French Revolution | 0 | - | 4.47 | 24,117 |
| History of France | 0 | - | 4.61 | 57,483 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,545 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,364 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,177 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,008 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,925 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,409 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,566 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,387 |
| Byzantine History | 0 | - | 4.91 | 28,994 |
| Byzantine Emperors | 0 | - | 4.92 | 14,517 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,535 |
| History of The Netherlands | 0 | - | 4.46 | 17,530 |
| The Vikings! | 0 | - | 4.46 | 28,394 |
| The Portuguese Empire | 0 | - | 4.58 | 12,095 |
| Arthurian Legend | 0 | - | 4.33 | 25,159 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,439 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,126 |
| Geography of the British Empire | 0 | - | 4.48 | 39,818 |
| Medieval English History | 0 | - | 4.53 | 43,620 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,451,175 |
| Asia Map Quiz | 0 | - | 4.99 | 923,239 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,579 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,258 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,455 |
| History of Iran | 0 | - | 4.66 | 16,406 |
| Chinese Inventions | 0 | - | 4.30 | 33,847 |
| History of China | 0 | - | 4.35 | 57,478 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,747 |
| China Multiple Choice | 0 | - | 4.50 | 37,379 |
| History of India | 0 | - | 4.62 | 21,490 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,607 |
| Africa Map Quiz | 0 | - | 5.00 | 2,126,261 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,853 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,039 |
| Countries by Founding Story | 0 | - | 4.95 | 77,636 |
| Independence from Whom | 0 | - | 4.99 | 212,692 |
