| Prime Ministers of the UK | 0 | - | 4.95 | 443,172 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,282 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,241 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,004 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,748 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,731,203 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,143 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,753 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,651 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,770 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,672 |
| Byzantine History | 0 | - | 4.91 | 29,050 |
| Byzantine Emperors | 0 | - | 4.93 | 14,663 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,590 |
| National Founders | 0 | - | 4.40 | 84,002 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,880 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,899 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,510 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,618 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,978 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,033 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,966 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,557 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,045 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,016 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,017 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,733 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,968 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,844 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,690 |
| Political Movements by Country | 0 | - | 4.46 | 72,833 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,189 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,161 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,166 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,876 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,992 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,827 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,426 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,983 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,423 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,274 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,194 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,041 |
| Name the English Monarchs | 0 | - | 4.91 | 507,400 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,088 |
| Countries of the Popes | 0 | - | 4.79 | 128,898 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,726 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,148 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,758 |
| 15 Largest Cities in the Middle East With a Map | 0 | - | 4.92 | 119,546 |
| Countries Bordering Iran | 0 | - | 4.83 | 96,162 |
| Countries that Border Iraq | 0 | - | 4.97 | 109,205 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,113 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,085 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,707 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,833 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,217 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,140 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,492 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,107 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,614 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,692 |
| The Trojan War | 0 | - | 4.83 | 40,073 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,974 |
| Name that Greek Letter | 0 | - | 4.93 | 325,288 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,219 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,695 |
| Roman Emperors | 0 | - | 4.95 | 121,441 |
| Egypt Country Quiz | 0 | - | 4.82 | 78,013 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,942 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,111 |
| Hindu Countries | 0 | - | 4.86 | 50,672 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,603 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,667 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,468 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,757 |
| Presidential Middle Names | 0 | - | 4.42 | 60,803 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,744 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,939 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,252 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,656 |
| The American Revolution | 0 | - | 4.52 | 54,389 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,061 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,552 |
| History of Russia Quiz | 0 | - | 4.47 | 32,026 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,219 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,134 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,448 |
| Ancient Greek Words | 0 | - | 4.93 | 112,662 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,914 |
| History of Italy | 0 | - | 4.55 | 32,185 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,594 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,851 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,469 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,938 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,033 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,144 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,086 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,186 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,097 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,338 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,171 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,545 |
| Countries that Beat Egypt | 0 | - | 4.91 | 67,233 |
| Countries Closest to Israel | 0 | - | 4.69 | 106,894 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,242 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,676 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,831 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,417 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,658 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,750 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,827 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,219 |
| Europe Map Quiz | 0 | - | 5.00 | 4,793,477 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,247 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 217,455 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,673 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,738 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,699 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,593 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,445 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,850 |
| Pope Facts | 0 | - | 4.39 | 31,427 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 281,033 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 171,196 |
| The Vietnam War | 0 | - | 4.44 | 35,690 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,666 |
| Communist Countries in History | 0 | - | 4.63 | 498,772 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,399 |
| Australian Capitals | 0 | - | 4.92 | 62,862 |
| History of Mexico | 0 | - | 4.52 | 15,376 |
| United States Map Quiz | 0 | - | 4.98 | 4,173,602 |
| American Political Words | 0 | - | 4.39 | 23,487 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,224 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,577 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,912 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,174 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,380 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,798 |
| First Ladies of the United States | 0 | - | 4.28 | 86,024 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,336 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,533 |
| U.S. President Scramble | 0 | - | 4.40 | 117,559 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,385 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,120 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,370 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,618 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,116 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,962 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,868 |
| Official European Union Languages | 0 | - | 4.97 | 240,374 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,824 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,406 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,984 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,506 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,231 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Geography of the French Empire | 0 | - | 4.45 | 27,234 |
| The French Revolution | 0 | - | 4.47 | 24,166 |
| History of France | 0 | - | 4.61 | 57,727 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,577 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,666 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,279 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,073 |
| Mythology A-Z | 0 | - | 4.31 | 37,449 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,029 |
| Figures from Greek Mythology | 0 | - | 4.91 | 191,756 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,553 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,158 |
| History of The Netherlands | 0 | - | 4.46 | 17,572 |
| The Vikings! | 0 | - | 4.46 | 28,424 |
| The Portuguese Empire | 0 | - | 4.58 | 12,117 |
| Arthurian Legend | 0 | - | 4.33 | 25,194 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,489 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,377 |
| Geography of the British Empire | 0 | - | 4.48 | 39,878 |
| Medieval English History | 0 | - | 4.53 | 43,690 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,657 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,453 |
| Asia Map Quiz | 0 | - | 4.99 | 926,786 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,054 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,700 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,718 |
| Flags of the Middle East | 0 | - | 4.69 | 62,863 |
| History of Iran | 0 | - | 4.66 | 16,439 |
| Iran Country Quiz | 0 | - | 4.49 | 60,769 |
| Iraq Country Quiz | 0 | - | 4.43 | 41,188 |
| The Iraq War | 0 | - | 4.47 | 15,719 |
| Biggest Cities in Turkey on a Map | 0 | - | 4.26 | 20,819 |
| English Words of Arabic Origin | 0 | - | 4.54 | 49,922 |
| Vietnam War Countries | 0 | - | 4.82 | 94,758 |
| Chinese Inventions | 0 | - | 4.30 | 33,873 |
| History of China | 0 | - | 4.35 | 57,679 |
| History of India | 0 | - | 4.62 | 21,527 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,705 |
| Africa Map Quiz | 0 | - | 5.00 | 2,130,810 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,505 |
| History of South Africa | 0 | - | 4.60 | 17,778 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,297 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,227 |
