| Prime Ministers of the UK | 0 | - | 4.96 | 434,233 |
| Hindu Countries | 0 | - | 4.85 | 49,461 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,651 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,989 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,174 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,037 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,989 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,173 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,563 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,234 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,371 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,646 |
| National Founders | 0 | - | 4.40 | 83,626 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,404 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,402 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,568 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,215 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,659 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,625 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,819 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,320 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,273 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,015 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,933 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,618 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,493 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,606 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,824 |
| Political Movements by Country | 0 | - | 4.46 | 72,235 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,740 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,613 |
| Countries Bordering India | 0 | - | 4.98 | 162,553 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,141 |
| Countries Closest to India | 0 | - | 4.97 | 102,162 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,806 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,137 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,313 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,717 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,872 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,492 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,665 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,158 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,105 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,069 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,130 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,057 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,890 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,918 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,430 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,149 |
| Name the English Monarchs | 0 | - | 4.92 | 497,524 |
| Name the Popes Quiz | 0 | - | 4.47 | 136,989 |
| Countries of the Popes | 0 | - | 4.79 | 127,104 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,510 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,094 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,732 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,212 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,808 |
| Biggest Cities in India | 0 | - | 4.70 | 67,288 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,198 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,905 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,366 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,265 |
| The Trojan War | 0 | - | 4.83 | 39,400 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,374 |
| Name that Greek Letter | 0 | - | 4.94 | 321,476 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,399 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,990 |
| Roman Emperors | 0 | - | 4.95 | 118,341 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,152 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,136 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,659 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,348 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,014 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,901 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,962 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,779 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,871 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,388 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,930 |
| Presidential Middle Names | 0 | - | 4.41 | 59,647 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,683 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,762 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,713 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,148 |
| The American Revolution | 0 | - | 4.52 | 54,040 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,106 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,390 |
| History of Russia Quiz | 0 | - | 4.49 | 31,776 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,651 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,705 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,184 |
| Ancient Greek Words | 0 | - | 4.92 | 110,595 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,127 |
| History of Italy | 0 | - | 4.55 | 31,801 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,295 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,468 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,965 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,625 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,483 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,362 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,438 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,814 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,522 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,588 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,653 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,707 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,479 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,378 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,231 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,332 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,072 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,330 |
| Europe Map Quiz | 0 | - | 5.00 | 4,728,409 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,722 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,135 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,596 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,244 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,729 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,368 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,216 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,383 |
| Pope Facts | 0 | - | 4.39 | 31,019 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 276,982 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,632 |
| The Vietnam War | 0 | - | 4.43 | 35,280 |
| Communist Countries in History | 0 | - | 4.63 | 492,186 |
| History of India | 0 | - | 4.61 | 21,268 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,110 |
| Africa Map Quiz | 0 | - | 5.00 | 2,103,118 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,366 |
| History of South Africa | 0 | - | 4.60 | 17,592 |
| Oceania Map Quiz | 0 | - | 4.98 | 634,677 |
| Australian Capitals | 0 | - | 4.92 | 62,586 |
| History of Mexico | 0 | - | 4.58 | 15,223 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,176 |
| American Political Words | 0 | - | 4.39 | 23,329 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,066 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,456 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,803 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,156 |
| First Ladies of the United States | 0 | - | 4.28 | 85,211 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,808 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,101 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,201 |
| U.S. President Scramble | 0 | - | 4.40 | 116,148 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,989 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,819 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,006 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,676 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,673 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,539 |
| Official European Union Languages | 0 | - | 4.97 | 236,395 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,619 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,932 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,393 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,494 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,193 |
| History of Austria | 0 | - | 4.70 | 17,740 |
| Geography of the French Empire | 0 | - | 4.48 | 26,917 |
| The French Revolution | 0 | - | 4.46 | 23,756 |
| History of France | 0 | - | 4.59 | 55,918 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,374 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,908 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,744 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,757 |
| Mythology A-Z | 0 | - | 4.31 | 36,967 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,739 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,692 |
| Byzantine History | 0 | - | 4.91 | 28,593 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,374 |
| History of The Netherlands | 0 | - | 4.46 | 17,299 |
| The Vikings! | 0 | - | 4.45 | 28,236 |
| The Portuguese Empire | 0 | - | 4.54 | 11,984 |
| Arthurian Legend | 0 | - | 4.33 | 25,047 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,157 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,717 |
| Geography of the British Empire | 0 | - | 4.48 | 39,464 |
| Medieval English History | 0 | - | 4.53 | 43,295 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,540 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,438,465 |
| Asia Map Quiz | 0 | - | 4.99 | 906,150 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,778 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,152 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,181 |
| History of Iran | 0 | - | 4.65 | 16,260 |
| The Iraq War | 0 | - | 4.47 | 15,543 |
| Ottoman Empire Quiz | 0 | - | 4.46 | 17,004 |
| Vietnam War Countries | 0 | - | 4.83 | 93,548 |
| Chinese Inventions | 0 | - | 4.30 | 33,713 |
| History of China | 0 | - | 4.37 | 56,655 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,623 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,106 |
| Countries by Founding Story | 0 | - | 4.95 | 76,466 |
| Independence from Whom | 0 | - | 4.99 | 209,534 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,620 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,951 |
| India A-Z | 0 | - | 4.42 | 33,905 |
| Countries that Beat India | 0 | - | 4.41 | 62,556 |
| Countries of Africa | 0 | - | 5.00 | 2,505,363 |
