| Prime Ministers of the UK | 0 | - | 4.95 | 439,937 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,996 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,619 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,367 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,707,039 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,089 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,245 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,700 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,178 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,886 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,276 |
| National Founders | 0 | - | 4.40 | 83,872 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,980 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,254 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,173 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,265 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,714 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,535 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,448 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,698 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,210 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,045 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,287 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,108 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,861 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 136,395 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,356 |
| Political Movements by Country | 0 | - | 4.46 | 72,612 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,063 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,397 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,751 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,407 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,783 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,029 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,104 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,931 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,830 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,040 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,565 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,973 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,760 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,936 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,333 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,403 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,944 |
| Name the English Monarchs | 0 | - | 4.91 | 503,781 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,406 |
| Countries of the Popes | 0 | - | 4.79 | 128,312 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,960 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,437 |
| Top 10 Richest Countries in Asia | 0 | - | 4.74 | 105,829 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,786 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,978 |
| Hindu Countries | 0 | - | 4.86 | 50,287 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,691 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,554 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,547 |
| The Trojan War | 0 | - | 4.83 | 39,791 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,683 |
| Name that Greek Letter | 0 | - | 4.93 | 324,119 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,194 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,640 |
| Roman Emperors | 0 | - | 4.95 | 120,345 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,082 |
| World Capitals Closest to Bangkok | 0 | - | 4.91 | 41,041 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,527 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,473 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,188 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,536 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,394 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,910 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,690 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 93,972 |
| Presidential Middle Names | 0 | - | 4.41 | 60,393 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,440 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,659 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,044 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,477 |
| The American Revolution | 0 | - | 4.52 | 54,290 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,461 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,730 |
| History of Russia Quiz | 0 | - | 4.47 | 31,945 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,018 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,651 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,748 |
| Ancient Greek Words | 0 | - | 4.93 | 111,875 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,455 |
| History of Italy | 0 | - | 4.55 | 32,047 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,488 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,716 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,292 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,403 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,837 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,947 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,513 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,080 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,885 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,084 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,022 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,961 |
| Singapore Airlines Destinations on a Map | 0 | - | 4.93 | 24,984 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,713 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,556 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,321 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,195 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,258 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 134,570 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,902 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,839 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,045 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,455 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,673 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,816 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,784 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,555 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,872 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,711 |
| Pope Facts | 0 | - | 4.39 | 31,288 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,601 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,314 |
| The Vietnam War | 0 | - | 4.44 | 35,571 |
| Communist Countries in History | 0 | - | 4.63 | 496,424 |
| History of India | 0 | - | 4.62 | 21,449 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,514 |
| Africa Map Quiz | 0 | - | 5.00 | 2,121,301 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,006 |
| History of South Africa | 0 | - | 4.60 | 17,714 |
| Oceania Map Quiz | 0 | - | 4.98 | 643,649 |
| Australian Capitals | 0 | - | 4.92 | 62,748 |
| History of Mexico | 0 | - | 4.58 | 15,333 |
| United States Map Quiz | 0 | - | 4.98 | 4,163,063 |
| American Political Words | 0 | - | 4.39 | 23,437 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,179 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,540 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,874 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,448 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,278 |
| First Ladies of the United States | 0 | - | 4.28 | 85,727 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,977 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,243 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,229 |
| U.S. President Scramble | 0 | - | 4.40 | 116,905 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,234 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,996 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,215 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,943 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,853 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,304 |
| Official European Union Languages | 0 | - | 4.97 | 238,876 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,101 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,928 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,782 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,141 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,843 |
| History of Austria | 0 | - | 4.70 | 17,900 |
| Geography of the French Empire | 0 | - | 4.45 | 27,151 |
| The French Revolution | 0 | - | 4.47 | 24,054 |
| History of France | 0 | - | 4.59 | 57,249 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,373 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,066 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,945 |
| Mythology A-Z | 0 | - | 4.31 | 37,277 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,834 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,644 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,251 |
| Byzantine History | 0 | - | 4.91 | 28,910 |
| Byzantine Emperors | 0 | - | 4.92 | 14,349 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,200 |
| History of The Netherlands | 0 | - | 4.46 | 17,476 |
| The Vikings! | 0 | - | 4.46 | 28,368 |
| The Portuguese Empire | 0 | - | 4.58 | 12,081 |
| Arthurian Legend | 0 | - | 4.33 | 25,128 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,398 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,643 |
| Geography of the British Empire | 0 | - | 4.48 | 39,733 |
| Medieval English History | 0 | - | 4.53 | 43,565 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,621 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,449,546 |
| Asia Map Quiz | 0 | - | 4.99 | 919,190 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,941 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,505 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,211 |
| History of Iran | 0 | - | 4.66 | 16,373 |
| The Iraq War | 0 | - | 4.47 | 15,670 |
| Vietnam War Countries | 0 | - | 4.82 | 94,345 |
| Chinese Inventions | 0 | - | 4.30 | 33,820 |
| History of China | 0 | - | 4.37 | 57,306 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,456 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,847 |
| Countries by Founding Story | 0 | - | 4.95 | 77,360 |
| Independence from Whom | 0 | - | 4.99 | 212,070 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,715 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,593 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,699 |
| Countries of Africa | 0 | - | 5.00 | 2,543,826 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 99,077 |
| Flags of Africa Quiz | 0 | - | 5.00 | 472,909 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 47,070 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 217,287 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 116,771 |
