| Prime Ministers of the UK | 0 | - | 4.96 | 434,745 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,689 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,056 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,267 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,655,483 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,002 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,278 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,575 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,449 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,693 |
| National Founders | 0 | - | 4.40 | 83,654 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,816 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,613 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,627 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,357 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,891 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,685 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,979 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,448 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,441 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,139 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,034 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,642 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,535 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,815 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,865 |
| Political Movements by Country | 0 | - | 4.46 | 72,267 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,919 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,699 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,875 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,188 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,374 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,743 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,884 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,534 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,670 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,288 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,156 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,177 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,284 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,120 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,994 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,964 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,323 |
| Name the English Monarchs | 0 | - | 4.92 | 498,043 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,175 |
| Countries of the Popes | 0 | - | 4.79 | 127,242 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,723 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,297 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,813 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,289 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,821 |
| Hindu Countries | 0 | - | 4.86 | 49,596 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,971 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,377 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,294 |
| The Trojan War | 0 | - | 4.83 | 39,442 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 642,030 |
| Name that Greek Letter | 0 | - | 4.94 | 321,717 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,568 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,060 |
| Roman Emperors | 0 | - | 4.95 | 118,509 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,228 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,187 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,743 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,463 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,373 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,957 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,979 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,957 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,965 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,518 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,010 |
| Presidential Middle Names | 0 | - | 4.41 | 59,717 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,747 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,830 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,750 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,176 |
| The American Revolution | 0 | - | 4.52 | 54,060 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,423 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,495 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,697 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,799 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,320 |
| Ancient Greek Words | 0 | - | 4.92 | 110,720 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,325 |
| History of Italy | 0 | - | 4.55 | 31,820 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,317 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,487 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,984 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,695 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,510 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,443 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,526 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,945 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,548 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,636 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,704 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,828 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,556 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,560 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,407 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,434 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,590 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,534 |
| Europe Map Quiz | 0 | - | 5.00 | 4,732,049 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,752 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,609 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,773 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,382 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,862 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,497 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,620 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,399 |
| Pope Facts | 0 | - | 4.39 | 31,050 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,130 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,811 |
| The Vietnam War | 0 | - | 4.43 | 35,299 |
| Communist Countries in History | 0 | - | 4.63 | 492,581 |
| History of India | 0 | - | 4.61 | 21,288 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,182 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,628 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,428 |
| History of South Africa | 0 | - | 4.60 | 17,602 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,431 |
| Australian Capitals | 0 | - | 4.92 | 62,594 |
| History of Mexico | 0 | - | 4.58 | 15,231 |
| United States Map Quiz | 0 | - | 4.98 | 4,142,145 |
| American Political Words | 0 | - | 4.39 | 23,341 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,075 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,464 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,809 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,168 |
| First Ladies of the United States | 0 | - | 4.28 | 85,248 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,817 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,113 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,307 |
| U.S. President Scramble | 0 | - | 4.40 | 116,212 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,003 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,838 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,029 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,697 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,690 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,592 |
| Official European Union Languages | 0 | - | 4.97 | 236,731 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,715 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,272 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,428 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,558 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,252 |
| History of Austria | 0 | - | 4.70 | 17,755 |
| Geography of the French Empire | 0 | - | 4.48 | 26,940 |
| The French Revolution | 0 | - | 4.46 | 23,786 |
| History of France | 0 | - | 4.59 | 56,083 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,388 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,937 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,781 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,774 |
| Mythology A-Z | 0 | - | 4.31 | 37,005 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,999 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,742 |
| Byzantine History | 0 | - | 4.91 | 28,627 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,496 |
| History of The Netherlands | 0 | - | 4.46 | 17,316 |
| The Vikings! | 0 | - | 4.46 | 28,247 |
| The Portuguese Empire | 0 | - | 4.54 | 11,993 |
| Arthurian Legend | 0 | - | 4.33 | 25,050 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,188 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,805 |
| Geography of the British Empire | 0 | - | 4.48 | 39,479 |
| Medieval English History | 0 | - | 4.53 | 43,325 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,546 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,696 |
| Asia Map Quiz | 0 | - | 4.99 | 907,205 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,785 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,188 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,294 |
| History of Iran | 0 | - | 4.65 | 16,272 |
| The Iraq War | 0 | - | 4.47 | 15,557 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,028 |
| Vietnam War Countries | 0 | - | 4.83 | 93,624 |
| Chinese Inventions | 0 | - | 4.30 | 33,724 |
| History of China | 0 | - | 4.37 | 56,696 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,039 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,178 |
| Countries by Founding Story | 0 | - | 4.95 | 76,557 |
| Independence from Whom | 0 | - | 4.99 | 209,720 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,778 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,010 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,231 |
| Countries of Africa | 0 | - | 5.00 | 2,508,507 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,441 |
| Flags of Africa Quiz | 0 | - | 5.00 | 463,554 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,834 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 215,648 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 115,597 |
| 10 Northernmost Countries in Africa | 0 | - | 4.98 | 160,297 |
| Top 10 Smallest African Countries by Area | 0 | - | 4.96 | 32,515 |
| African East Coast | 0 | - | 4.96 | 95,071 |
