| Prime Ministers of the UK | 0 | - | 4.95 | 439,920 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,996 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,614 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,350 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,706,863 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,088 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,244 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,700 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,174 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,885 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,275 |
| National Founders | 0 | - | 4.40 | 83,871 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,967 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,240 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,167 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,261 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,710 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,527 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,443 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,689 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,186 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,038 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,281 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,106 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,860 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 136,389 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,353 |
| Political Movements by Country | 0 | - | 4.46 | 72,607 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,058 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,392 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,745 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,404 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,779 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,028 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,102 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,929 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,829 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,032 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,564 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,967 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,749 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,931 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,326 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,402 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,938 |
| Name the English Monarchs | 0 | - | 4.91 | 503,757 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,399 |
| Countries of the Popes | 0 | - | 4.79 | 128,305 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,955 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,432 |
| Top 10 Richest Countries in Asia | 0 | - | 4.74 | 105,827 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,784 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,976 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,687 |
| Hindu Countries | 0 | - | 4.86 | 50,280 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,688 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,554 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,546 |
| The Trojan War | 0 | - | 4.83 | 39,787 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,660 |
| Name that Greek Letter | 0 | - | 4.93 | 324,110 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,182 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,637 |
| Roman Emperors | 0 | - | 4.95 | 120,340 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,080 |
| World Capitals Closest to Bangkok | 0 | - | 4.91 | 41,039 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,084 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,520 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,468 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,182 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,536 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,393 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,907 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,683 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 93,968 |
| Presidential Middle Names | 0 | - | 4.41 | 60,387 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,439 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,655 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,042 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,476 |
| The American Revolution | 0 | - | 4.52 | 54,287 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,422 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,721 |
| History of Russia Quiz | 0 | - | 4.47 | 31,945 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,017 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,646 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,732 |
| Ancient Greek Words | 0 | - | 4.93 | 111,863 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,445 |
| History of Italy | 0 | - | 4.55 | 32,046 |
| 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 | 108,399 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,836 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,945 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,511 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,076 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,882 |
| 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 | 82,955 |
| Singapore Airlines Destinations on a Map | 0 | - | 4.93 | 24,979 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,707 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,545 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,314 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,191 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,248 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 134,560 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,899 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,690 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,042 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,422 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,669 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,811 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,776 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,847 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,710 |
| Pope Facts | 0 | - | 4.39 | 31,287 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,572 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,309 |
| The Vietnam War | 0 | - | 4.44 | 35,570 |
| Communist Countries in History | 0 | - | 4.63 | 496,409 |
| History of India | 0 | - | 4.62 | 21,449 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,509 |
| Africa Map Quiz | 0 | - | 5.00 | 2,121,224 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,002 |
| History of South Africa | 0 | - | 4.60 | 17,714 |
| Oceania Map Quiz | 0 | - | 4.98 | 643,617 |
| Australian Capitals | 0 | - | 4.92 | 62,746 |
| History of Mexico | 0 | - | 4.58 | 15,329 |
| United States Map Quiz | 0 | - | 4.98 | 4,162,965 |
| 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 | 136,442 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,277 |
| First Ladies of the United States | 0 | - | 4.28 | 85,724 |
| 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 | 77,225 |
| U.S. President Scramble | 0 | - | 4.40 | 116,901 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,233 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,993 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,214 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,940 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,852 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,302 |
| Official European Union Languages | 0 | - | 4.97 | 238,863 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,094 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,893 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,780 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,140 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,840 |
| History of Austria | 0 | - | 4.70 | 17,900 |
| Geography of the French Empire | 0 | - | 4.45 | 27,151 |
| The French Revolution | 0 | - | 4.47 | 24,053 |
| History of France | 0 | - | 4.59 | 57,244 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,371 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,064 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,945 |
| Mythology A-Z | 0 | - | 4.31 | 37,276 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,830 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,617 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,250 |
| Byzantine History | 0 | - | 4.91 | 28,908 |
| Byzantine Emperors | 0 | - | 4.92 | 14,348 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,199 |
| History of The Netherlands | 0 | - | 4.46 | 17,475 |
| The Vikings! | 0 | - | 4.46 | 28,367 |
| 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 | 122,642 |
| Geography of the British Empire | 0 | - | 4.48 | 39,733 |
| Medieval English History | 0 | - | 4.53 | 43,564 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,621 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,449,514 |
| Asia Map Quiz | 0 | - | 4.99 | 919,140 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,940 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,505 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,207 |
| History of Iran | 0 | - | 4.66 | 16,373 |
| The Iraq War | 0 | - | 4.47 | 15,670 |
| Singapore Country Quiz | 0 | - | 4.74 | 45,489 |
| Philippines Country Quiz | 0 | - | 4.56 | 75,638 |
| Thailand Country Quiz | 0 | - | 4.51 | 53,395 |
| Indonesia Country Quiz | 0 | - | 4.78 | 75,289 |
| Largest Indonesian Islands | 0 | - | 4.75 | 50,113 |
| Malaysia Country Quiz | 0 | - | 4.59 | 39,264 |
| Vietnam War Countries | 0 | - | 4.82 | 94,344 |
| Chinese Inventions | 0 | - | 4.30 | 33,818 |
| History of China | 0 | - | 4.37 | 57,303 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,453 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,841 |
| Countries by Founding Story | 0 | - | 4.95 | 77,356 |
| Independence from Whom | 0 | - | 4.99 | 212,061 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,705 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,590 |
