| Prime Ministers of the UK | 0 | - | 4.95 | 440,545 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,946 |
| Prime Ministers of Australia | 0 | - | 4.50 | 32,058 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,700 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,863 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,266 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,103 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,322 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,163 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,714 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,248 |
| Byzantine History | 0 | - | 4.91 | 28,936 |
| Byzantine Emperors | 0 | - | 4.92 | 14,410 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,321 |
| National Founders | 0 | - | 4.40 | 83,896 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,273 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,478 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,245 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,311 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,822 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,746 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,529 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,844 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,857 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,206 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,415 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,216 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,875 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 136,665 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,401 |
| Political Movements by Country | 0 | - | 4.46 | 72,644 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,052 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,114 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,964 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,834 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,332 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,622 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,100 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,939 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,996 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,497 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,456 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,128 |
| Name the English Monarchs | 0 | - | 4.91 | 504,408 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,524 |
| Countries of the Popes | 0 | - | 4.79 | 128,405 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,042 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,578 |
| Top 10 Richest Countries in Asia | 0 | - | 4.74 | 105,910 |
| 15 Largest Cities in the Middle East With a Map | 0 | - | 4.92 | 118,818 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,717 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,799 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,831 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,007 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,151 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,460 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,811 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,499 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,870 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,744 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,563 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,570 |
| The Trojan War | 0 | - | 4.83 | 39,836 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,529 |
| Name that Greek Letter | 0 | - | 4.93 | 324,309 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,368 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,883 |
| Roman Emperors | 0 | - | 4.95 | 120,504 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,693 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,613 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,569 |
| Hindu Countries | 0 | - | 4.86 | 50,341 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,422 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,987 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,792 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,131 |
| Presidential Middle Names | 0 | - | 4.41 | 60,465 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,481 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,691 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,073 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,503 |
| The American Revolution | 0 | - | 4.52 | 54,296 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,893 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,857 |
| History of Russia Quiz | 0 | - | 4.47 | 31,968 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,045 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,727 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,182 |
| Ancient Greek Words | 0 | - | 4.93 | 112,020 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,680 |
| History of Italy | 0 | - | 4.55 | 32,080 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,511 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,742 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,315 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,465 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,871 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,985 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,596 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,208 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,928 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,120 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,051 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,052 |
| Countries that Beat Egypt | 0 | - | 4.88 | 57,152 |
| Countries Closest to Israel | 0 | - | 4.69 | 106,318 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,806 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,252 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,582 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,570 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,258 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,584 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,744 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,947 |
| Europe Map Quiz | 0 | - | 5.00 | 4,773,989 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,075 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,943 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,846 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,961 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,101 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,725 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,316 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,739 |
| Pope Facts | 0 | - | 4.39 | 31,312 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,848 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,471 |
| The Vietnam War | 0 | - | 4.44 | 35,590 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,734 |
| Communist Countries in History | 0 | - | 4.63 | 496,825 |
| History of South Africa | 0 | - | 4.60 | 17,726 |
| Oceania Map Quiz | 0 | - | 4.98 | 655,441 |
| Australian Capitals | 0 | - | 4.92 | 62,773 |
| History of Mexico | 0 | - | 4.58 | 15,340 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,605 |
| American Political Words | 0 | - | 4.39 | 23,439 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,184 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,541 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,876 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,576 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,292 |
| First Ladies of the United States | 0 | - | 4.28 | 85,775 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,987 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,253 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,295 |
| U.S. President Scramble | 0 | - | 4.40 | 117,160 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,249 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,012 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,239 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,964 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,865 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,389 |
| Official European Union Languages | 0 | - | 4.97 | 239,058 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,220 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,449 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,815 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,201 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,905 |
| History of Austria | 0 | - | 4.70 | 17,921 |
| Geography of the French Empire | 0 | - | 4.45 | 27,165 |
| The French Revolution | 0 | - | 4.47 | 24,075 |
| History of France | 0 | - | 4.61 | 57,337 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,417 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,109 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,966 |
| Mythology A-Z | 0 | - | 4.31 | 37,310 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,864 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,920 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,298 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,308 |
| History of The Netherlands | 0 | - | 4.46 | 17,498 |
| The Vikings! | 0 | - | 4.46 | 28,374 |
| The Portuguese Empire | 0 | - | 4.58 | 12,087 |
| Arthurian Legend | 0 | - | 4.33 | 25,135 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,423 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,964 |
| Geography of the British Empire | 0 | - | 4.48 | 39,767 |
| Medieval English History | 0 | - | 4.53 | 43,589 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,632 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,450,018 |
| Asia Map Quiz | 0 | - | 4.99 | 920,462 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,963 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,534 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,282 |
| Flags of the Middle East | 0 | - | 4.69 | 62,720 |
| History of Iran | 0 | - | 4.66 | 16,389 |
| Iran Country Quiz | 0 | - | 4.49 | 60,512 |
| Iraq Country Quiz | 0 | - | 4.43 | 41,024 |
| The Iraq War | 0 | - | 4.47 | 15,677 |
| Biggest Cities in Turkey on a Map | 0 | - | 4.25 | 20,614 |
| English Words of Arabic Origin | 0 | - | 4.54 | 49,819 |
| Vietnam War Countries | 0 | - | 4.82 | 94,398 |
| Chinese Inventions | 0 | - | 4.30 | 33,826 |
| History of China | 0 | - | 4.37 | 57,368 |
| History of India | 0 | - | 4.62 | 21,467 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,542 |
| Africa Map Quiz | 0 | - | 5.00 | 2,122,825 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,070 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,572 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,903 |
| Countries by Founding Story | 0 | - | 4.95 | 77,438 |
| Independence from Whom | 0 | - | 4.99 | 212,276 |
