| Prime Ministers of the UK | 0 | - | 4.96 | 434,656 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,681 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,042 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,253 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,654,632 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,998 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,264 |
| Hindu Countries | 0 | - | 4.85 | 49,581 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,575 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,435 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,682 |
| National Founders | 0 | - | 4.40 | 83,649 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,758 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,579 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,617 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,329 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,862 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,677 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,951 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,428 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,419 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,114 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,021 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,638 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,520 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,782 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,861 |
| Political Movements by Country | 0 | - | 4.46 | 72,261 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,901 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,681 |
| Countries Bordering India | 0 | - | 4.98 | 162,604 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,178 |
| Countries Closest to India | 0 | - | 4.97 | 102,209 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,863 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,178 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,365 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,737 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,882 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,526 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,670 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,257 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,148 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,156 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,264 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,111 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,972 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,954 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,497 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,290 |
| Name the English Monarchs | 0 | - | 4.92 | 497,914 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,161 |
| Countries of the Popes | 0 | - | 4.79 | 127,224 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,710 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,271 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,800 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,280 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,820 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,226 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,956 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,377 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,289 |
| The Trojan War | 0 | - | 4.83 | 39,428 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,941 |
| Name that Greek Letter | 0 | - | 4.94 | 321,673 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,539 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,050 |
| Roman Emperors | 0 | - | 4.95 | 118,493 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,218 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,181 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,733 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,449 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,354 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,945 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,977 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,943 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,952 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,503 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,002 |
| Presidential Middle Names | 0 | - | 4.41 | 59,704 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,739 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,822 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,746 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,175 |
| The American Revolution | 0 | - | 4.52 | 54,057 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,356 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,472 |
| History of Russia Quiz | 0 | - | 4.49 | 31,794 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,678 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,779 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,160 |
| Ancient Greek Words | 0 | - | 4.92 | 110,701 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,294 |
| History of Italy | 0 | - | 4.55 | 31,816 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,314 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,482 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,981 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,683 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,505 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,388 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,516 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,919 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,542 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,623 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,683 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,813 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,547 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,538 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,380 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,423 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,553 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,512 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,436 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,747 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,516 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,740 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,355 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,841 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,471 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,557 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,394 |
| Pope Facts | 0 | - | 4.39 | 31,043 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,106 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,772 |
| The Vietnam War | 0 | - | 4.43 | 35,294 |
| Communist Countries in History | 0 | - | 4.63 | 492,521 |
| History of India | 0 | - | 4.61 | 21,285 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,179 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,346 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,411 |
| History of South Africa | 0 | - | 4.60 | 17,602 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,319 |
| Australian Capitals | 0 | - | 4.92 | 62,593 |
| History of Mexico | 0 | - | 4.58 | 15,230 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,914 |
| American Political Words | 0 | - | 4.39 | 23,341 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,073 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,462 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,807 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,167 |
| First Ladies of the United States | 0 | - | 4.28 | 85,245 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,816 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,112 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,299 |
| U.S. President Scramble | 0 | - | 4.40 | 116,205 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,002 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,833 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,026 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,695 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,688 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,582 |
| Official European Union Languages | 0 | - | 4.97 | 236,534 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,703 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,207 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,421 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,548 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,241 |
| History of Austria | 0 | - | 4.70 | 17,748 |
| Geography of the French Empire | 0 | - | 4.48 | 26,934 |
| The French Revolution | 0 | - | 4.46 | 23,785 |
| History of France | 0 | - | 4.59 | 56,055 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,384 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,932 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,776 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,771 |
| Mythology A-Z | 0 | - | 4.31 | 36,999 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,957 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,734 |
| Byzantine History | 0 | - | 4.91 | 28,620 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,474 |
| History of The Netherlands | 0 | - | 4.46 | 17,311 |
| The Vikings! | 0 | - | 4.45 | 28,246 |
| The Portuguese Empire | 0 | - | 4.54 | 11,990 |
| Arthurian Legend | 0 | - | 4.33 | 25,050 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,175 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,780 |
| Geography of the British Empire | 0 | - | 4.48 | 39,473 |
| Medieval English History | 0 | - | 4.53 | 43,321 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,545 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,505 |
| Asia Map Quiz | 0 | - | 4.99 | 907,051 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,782 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,182 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,273 |
| History of Iran | 0 | - | 4.65 | 16,272 |
| The Iraq War | 0 | - | 4.47 | 15,552 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,025 |
| Vietnam War Countries | 0 | - | 4.83 | 93,610 |
| Chinese Inventions | 0 | - | 4.30 | 33,719 |
| History of China | 0 | - | 4.37 | 56,692 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,010 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,168 |
| Countries by Founding Story | 0 | - | 4.95 | 76,537 |
| Independence from Whom | 0 | - | 4.99 | 209,687 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,745 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,998 |
| Countries that Beat India | 0 | - | 4.41 | 62,591 |
| Biggest Cities in India | 0 | - | 4.70 | 67,335 |
| Countries of Africa | 0 | - | 5.00 | 2,507,958 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,435 |
| Flags of Africa Quiz | 0 | - | 5.00 | 463,412 |
