| Prime Ministers of the UK | 0 | - | 4.96 | 434,582 |
| Hindu Countries | 0 | - | 4.85 | 49,563 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,675 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,035 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,229 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,653,511 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,998 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,241 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,574 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,322 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,424 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,676 |
| National Founders | 0 | - | 4.40 | 83,646 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,635 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,517 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,614 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,305 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,811 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,662 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,927 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,403 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,384 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,098 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,007 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,633 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,517 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,736 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,858 |
| Political Movements by Country | 0 | - | 4.46 | 72,254 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,871 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,662 |
| Countries Bordering India | 0 | - | 4.98 | 162,590 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,165 |
| Countries Closest to India | 0 | - | 4.97 | 102,199 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,854 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,167 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,350 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,733 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,879 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,523 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,669 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,228 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,136 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,137 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,235 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,103 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,959 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,943 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,483 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,249 |
| Name the English Monarchs | 0 | - | 4.92 | 497,826 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,136 |
| Countries of the Popes | 0 | - | 4.79 | 127,196 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,680 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,234 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,785 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,265 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,818 |
| Biggest Cities in India | 0 | - | 4.70 | 67,325 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,219 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,951 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,375 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,287 |
| The Trojan War | 0 | - | 4.83 | 39,425 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,803 |
| Name that Greek Letter | 0 | - | 4.94 | 321,632 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,518 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,039 |
| Roman Emperors | 0 | - | 4.95 | 118,454 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,204 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,173 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,716 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,428 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,049 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,936 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,972 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,916 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,935 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,467 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,995 |
| Presidential Middle Names | 0 | - | 4.41 | 59,695 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,727 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,808 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,735 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,164 |
| The American Revolution | 0 | - | 4.52 | 54,052 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,297 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,451 |
| History of Russia Quiz | 0 | - | 4.49 | 31,788 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,673 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,763 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,007 |
| Ancient Greek Words | 0 | - | 4.92 | 110,683 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,266 |
| History of Italy | 0 | - | 4.55 | 31,813 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,312 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,479 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,979 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,663 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,505 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,382 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,499 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,898 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,539 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,617 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,677 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,796 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,534 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,503 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,338 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,396 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,506 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,476 |
| Europe Map Quiz | 0 | - | 5.00 | 4,730,780 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,739 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,411 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,712 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,340 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,817 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,449 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,478 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,391 |
| Pope Facts | 0 | - | 4.39 | 31,037 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,086 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,740 |
| The Vietnam War | 0 | - | 4.43 | 35,291 |
| Communist Countries in History | 0 | - | 4.63 | 492,463 |
| History of India | 0 | - | 4.61 | 21,281 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,159 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,099 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,404 |
| History of South Africa | 0 | - | 4.60 | 17,600 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,202 |
| Australian Capitals | 0 | - | 4.92 | 62,593 |
| History of Mexico | 0 | - | 4.58 | 15,230 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,478 |
| American Political Words | 0 | - | 4.39 | 23,339 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,073 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,461 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,806 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,163 |
| First Ladies of the United States | 0 | - | 4.28 | 85,239 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,813 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,110 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,267 |
| U.S. President Scramble | 0 | - | 4.40 | 116,192 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,998 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,832 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,018 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,693 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,682 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,573 |
| Official European Union Languages | 0 | - | 4.97 | 236,501 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,691 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,158 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,415 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,537 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,229 |
| History of Austria | 0 | - | 4.70 | 17,746 |
| Geography of the French Empire | 0 | - | 4.48 | 26,926 |
| The French Revolution | 0 | - | 4.46 | 23,782 |
| History of France | 0 | - | 4.59 | 56,019 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,382 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,928 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,768 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,766 |
| Mythology A-Z | 0 | - | 4.31 | 36,995 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,916 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,725 |
| Byzantine History | 0 | - | 4.91 | 28,614 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,460 |
| History of The Netherlands | 0 | - | 4.46 | 17,310 |
| The Vikings! | 0 | - | 4.45 | 28,244 |
| The Portuguese Empire | 0 | - | 4.54 | 11,989 |
| Arthurian Legend | 0 | - | 4.33 | 25,050 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,171 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,762 |
| Geography of the British Empire | 0 | - | 4.48 | 39,469 |
| Medieval English History | 0 | - | 4.53 | 43,314 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,545 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,008 |
| Asia Map Quiz | 0 | - | 4.99 | 906,884 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,782 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,181 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,252 |
| History of Iran | 0 | - | 4.65 | 16,271 |
| The Iraq War | 0 | - | 4.47 | 15,549 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,024 |
| Vietnam War Countries | 0 | - | 4.83 | 93,594 |
| Chinese Inventions | 0 | - | 4.30 | 33,718 |
| History of China | 0 | - | 4.37 | 56,686 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,902 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,155 |
| Countries by Founding Story | 0 | - | 4.95 | 76,518 |
| Independence from Whom | 0 | - | 4.99 | 209,649 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,722 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,988 |
| India A-Z | 0 | - | 4.42 | 33,920 |
| Countries that Beat India | 0 | - | 4.41 | 62,584 |
| Countries of Africa | 0 | - | 5.00 | 2,507,367 |
