| Prime Ministers of the UK | 0 | - | 4.96 | 434,367 |
| Hindu Countries | 0 | - | 4.85 | 49,496 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,659 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,997 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,188 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,964 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,995 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,195 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,568 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,260 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,389 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,654 |
| National Founders | 0 | - | 4.40 | 83,634 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,443 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,429 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,582 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,240 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,694 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,636 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,844 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,343 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,303 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,041 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,952 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,622 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,500 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,653 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,834 |
| Political Movements by Country | 0 | - | 4.46 | 72,242 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,770 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,629 |
| Countries Bordering India | 0 | - | 4.98 | 162,559 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,145 |
| Countries Closest to India | 0 | - | 4.97 | 102,175 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,817 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,145 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,328 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,720 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,874 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,498 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,668 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,175 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,117 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,092 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,157 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,069 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,906 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,923 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,442 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,169 |
| Name the English Monarchs | 0 | - | 4.92 | 497,612 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,032 |
| Countries of the Popes | 0 | - | 4.79 | 127,133 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,568 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,134 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,747 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,233 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,811 |
| Biggest Cities in India | 0 | - | 4.70 | 67,302 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,202 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,923 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,367 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,270 |
| The Trojan War | 0 | - | 4.83 | 39,409 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,493 |
| Name that Greek Letter | 0 | - | 4.94 | 321,502 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,445 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,011 |
| Roman Emperors | 0 | - | 4.95 | 118,364 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,165 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,153 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,679 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,371 |
| All Cities in India with Population of 1 Million | 0 | - | 4.83 | 47,025 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,907 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,965 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,827 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,890 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,408 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,946 |
| Presidential Middle Names | 0 | - | 4.41 | 59,660 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,694 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,769 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,721 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,150 |
| The American Revolution | 0 | - | 4.52 | 54,042 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,161 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,401 |
| History of Russia Quiz | 0 | - | 4.49 | 31,782 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,657 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,725 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,434 |
| Ancient Greek Words | 0 | - | 4.92 | 110,616 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,154 |
| History of Italy | 0 | - | 4.55 | 31,806 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,300 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,470 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,968 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,637 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,493 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,370 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,459 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,834 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,531 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,600 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,660 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,732 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,492 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,410 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,276 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,350 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,208 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,355 |
| Europe Map Quiz | 0 | - | 5.00 | 4,729,064 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,729 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,214 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,623 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,271 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,751 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,386 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,295 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,387 |
| Pope Facts | 0 | - | 4.39 | 31,025 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,019 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,670 |
| The Vietnam War | 0 | - | 4.43 | 35,283 |
| Communist Countries in History | 0 | - | 4.63 | 492,269 |
| History of India | 0 | - | 4.61 | 21,271 |
| Countries that Visit India the Most | 0 | - | 4.74 | 60,126 |
| Africa Map Quiz | 0 | - | 5.00 | 2,103,416 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,378 |
| History of South Africa | 0 | - | 4.60 | 17,598 |
| Oceania Map Quiz | 0 | - | 4.98 | 634,823 |
| Australian Capitals | 0 | - | 4.92 | 62,587 |
| History of Mexico | 0 | - | 4.58 | 15,224 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,507 |
| American Political Words | 0 | - | 4.39 | 23,333 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,070 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,457 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,804 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,160 |
| First Ladies of the United States | 0 | - | 4.28 | 85,217 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,809 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,102 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,215 |
| U.S. President Scramble | 0 | - | 4.40 | 116,160 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,992 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,822 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,012 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,682 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,677 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,551 |
| Official European Union Languages | 0 | - | 4.97 | 236,430 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,641 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,993 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,399 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,506 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,200 |
| History of Austria | 0 | - | 4.70 | 17,742 |
| Geography of the French Empire | 0 | - | 4.48 | 26,920 |
| The French Revolution | 0 | - | 4.46 | 23,761 |
| History of France | 0 | - | 4.59 | 55,949 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,378 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,916 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,753 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,762 |
| Mythology A-Z | 0 | - | 4.31 | 36,977 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,790 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,706 |
| Byzantine History | 0 | - | 4.91 | 28,598 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,396 |
| History of The Netherlands | 0 | - | 4.46 | 17,304 |
| The Vikings! | 0 | - | 4.45 | 28,237 |
| The Portuguese Empire | 0 | - | 4.54 | 11,984 |
| Arthurian Legend | 0 | - | 4.33 | 25,047 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,160 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,731 |
| Geography of the British Empire | 0 | - | 4.48 | 39,466 |
| Medieval English History | 0 | - | 4.53 | 43,303 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,544 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,439,044 |
| Asia Map Quiz | 0 | - | 4.99 | 906,399 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,779 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,156 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,207 |
| History of Iran | 0 | - | 4.65 | 16,262 |
| The Iraq War | 0 | - | 4.47 | 15,545 |
| Ottoman Empire Quiz | 0 | - | 4.46 | 17,014 |
| Vietnam War Countries | 0 | - | 4.83 | 93,567 |
| Chinese Inventions | 0 | - | 4.30 | 33,715 |
| History of China | 0 | - | 4.37 | 56,664 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,674 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,116 |
| Countries by Founding Story | 0 | - | 4.95 | 76,478 |
| Independence from Whom | 0 | - | 4.99 | 209,563 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,649 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,965 |
| India A-Z | 0 | - | 4.42 | 33,908 |
| Countries that Beat India | 0 | - | 4.41 | 62,563 |
| Countries of Africa | 0 | - | 5.00 | 2,505,915 |
