| Prime Ministers of the UK | 0 | - | 4.95 | 441,894 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,177 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,876 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,978 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,722,453 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,124 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,566 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,742 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,478 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,147 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,475 |
| National Founders | 0 | - | 4.40 | 83,951 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,255 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,397 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,393 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,470 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,721 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,599 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,809 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,222 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,089 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,640 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,732 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,485 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,920 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,274 |
| Countries of the Japanese Empire | 0 | - | 4.96 | 104,526 |
| Political Movements by Country | 0 | - | 4.46 | 72,737 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,121 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,138 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,071 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,859 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,669 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,723 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,037 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,542 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,241 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,951 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,609 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,580 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,809 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,617 |
| Name the English Monarchs | 0 | - | 4.91 | 505,931 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,833 |
| Countries of the Popes | 0 | - | 4.79 | 128,655 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,536 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,879 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,572 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,995 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,054 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,423 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,649 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,032 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,912 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,244 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,949 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,590 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,629 |
| The Trojan War | 0 | - | 4.83 | 39,951 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,286 |
| Name that Greek Letter | 0 | - | 4.93 | 324,828 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,821 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,545 |
| Roman Emperors | 0 | - | 4.95 | 121,068 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,443 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,794 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,862 |
| Hindu Countries | 0 | - | 4.87 | 50,535 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,520 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,321 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,236 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,557 |
| Presidential Middle Names | 0 | - | 4.41 | 60,672 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,617 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,874 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,177 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,611 |
| The American Revolution | 0 | - | 4.52 | 54,345 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,186 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,199 |
| History of Russia Quiz | 0 | - | 4.47 | 31,996 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,114 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,950 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,391 |
| Ancient Greek Words | 0 | - | 4.93 | 112,356 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,334 |
| History of Italy | 0 | - | 4.55 | 32,131 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,560 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,801 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,410 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,713 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,959 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,068 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,883 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,585 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,999 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,228 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,129 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,314 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,054 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,509 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,721 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,085 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,530 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,276 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,448 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,111 |
| Europe Map Quiz | 0 | - | 5.00 | 4,784,279 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,166 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 216,280 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,234 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,321 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,473 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,172 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,462 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,786 |
| Pope Facts | 0 | - | 4.39 | 31,370 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,503 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,834 |
| The Vietnam War | 0 | - | 4.44 | 35,636 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,223 |
| Communist Countries in History | 0 | - | 4.63 | 497,823 |
| History of South Africa | 0 | - | 4.60 | 17,755 |
| Oceania Map Quiz | 0 | - | 4.98 | 658,651 |
| Australian Capitals | 0 | - | 4.92 | 62,819 |
| History of Mexico | 0 | - | 4.52 | 15,360 |
| United States Map Quiz | 0 | - | 4.98 | 4,169,674 |
| American Political Words | 0 | - | 4.39 | 23,465 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,210 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,559 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,897 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,902 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,354 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,752 |
| First Ladies of the United States | 0 | - | 4.28 | 85,916 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.42 | 24,055 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,302 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,437 |
| U.S. President Scramble | 0 | - | 4.40 | 117,405 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,346 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,082 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,328 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 57,289 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,067 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,932 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,649 |
| Official European Union Languages | 0 | - | 4.97 | 239,626 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,547 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,552 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,902 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,377 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,099 |
| History of Austria | 0 | - | 4.70 | 17,966 |
| Geography of the French Empire | 0 | - | 4.45 | 27,202 |
| The French Revolution | 0 | - | 4.47 | 24,130 |
| History of France | 0 | - | 4.61 | 57,542 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,552 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,560 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,205 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,025 |
| Mythology A-Z | 0 | - | 4.31 | 37,380 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,942 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,619 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,415 |
| Byzantine History | 0 | - | 4.91 | 29,010 |
| Byzantine Emperors | 0 | - | 4.93 | 14,548 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,651 |
| History of The Netherlands | 0 | - | 4.46 | 17,539 |
| The Vikings! | 0 | - | 4.46 | 28,398 |
| The Portuguese Empire | 0 | - | 4.58 | 12,097 |
| Arthurian Legend | 0 | - | 4.33 | 25,166 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,446 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,184 |
| Geography of the British Empire | 0 | - | 4.48 | 39,832 |
| Medieval English History | 0 | - | 4.53 | 43,636 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,647 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,451,627 |
| Asia Map Quiz | 0 | - | 4.99 | 924,180 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,017 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,607 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,520 |
| History of Iran | 0 | - | 4.66 | 16,414 |
| The Iraq War | 0 | - | 4.47 | 15,699 |
| Vietnam War Countries | 0 | - | 4.82 | 94,558 |
| Chinese Inventions | 0 | - | 4.30 | 33,853 |
| History of China | 0 | - | 4.35 | 57,526 |
| History of India | 0 | - | 4.62 | 21,502 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,630 |
| Africa Map Quiz | 0 | - | 5.00 | 2,127,383 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 101,192 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,007 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,084 |
| Countries by Founding Story | 0 | - | 4.95 | 77,728 |
| Independence from Whom | 0 | - | 4.99 | 212,886 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,308 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,796 |
| Biggest Trading Partners - South Africa | 0 | - | 4.74 | 40,416 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.96 | 51,372 |
| Australian States and Territories | 0 | - | 4.96 | 142,761 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,476 |
