| Prime Ministers of the UK | 0 | - | 4.95 | 440,602 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,686 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,755 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,335 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,721 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,262 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,543 |
| Countries of the Popes | 0 | - | 4.79 | 128,418 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,297 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,105 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,003 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,810 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,210 |
| Presidential Middle Names | 0 | - | 4.41 | 60,468 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,507 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,486 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,694 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,510 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,249 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,357 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,318 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,716 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,689 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,829 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,074 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,770 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,539 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,858 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,890 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,217 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,425 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,226 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,513 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,970 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,595 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,298 |
| First Ladies of the United States | 0 | - | 4.28 | 85,781 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,254 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,302 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,251 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,015 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,356 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,865 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,630 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,368 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,135 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,582 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,149 |
| Name the English Monarchs | 0 | - | 4.91 | 504,482 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,584 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,164 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,814 |
| National Founders | 0 | - | 4.40 | 83,898 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,566 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,988 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,580 |
| The Trojan War | 0 | - | 4.83 | 39,844 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,592 |
| Name that Greek Letter | 0 | - | 4.93 | 324,326 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,396 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,965 |
| Roman Emperors | 0 | - | 4.95 | 120,528 |
| Pope Facts | 0 | - | 4.39 | 31,314 |
| Australia by Picture | 0 | - | 4.41 | 28,683 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,688 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,753 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,687 |
| The John Adams Presidency | 0 | - | 4.12 | 8,764 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,751 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,874 |
| The American Revolution | 0 | - | 4.52 | 54,298 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,921 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,874 |
| History of Russia Quiz | 0 | - | 4.47 | 31,970 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,878 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,731 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,234 |
| Ancient Greek Words | 0 | - | 4.93 | 112,036 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,711 |
| History of Italy | 0 | - | 4.55 | 32,084 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,744 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,323 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,872 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,991 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,605 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,012 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,322 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,583 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,605 |
| The George Washington Presidency | 0 | - | 4.03 | 14,571 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,952 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,338 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,715 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,267 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,606 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,761 |
| Europe Map Quiz | 0 | - | 5.00 | 4,774,320 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,078 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,968 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,860 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,968 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,294 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,222 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,734 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,726 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,013 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,902 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,876 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,409 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,749 |
| Communist Countries in History | 0 | - | 4.63 | 496,858 |
| History of South Africa | 0 | - | 4.60 | 17,728 |
| Oceania Map Quiz | 0 | - | 4.98 | 655,734 |
| Australian Capitals | 0 | - | 4.92 | 62,776 |
| Biggest Cities in Australia on a Map | 0 | - | 4.62 | 38,054 |
| History of Mexico | 0 | - | 4.58 | 15,341 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,811 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,057 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,116 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,838 |
| U.S. President Scramble | 0 | - | 4.40 | 117,167 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,241 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,969 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,446 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,398 |
| Official European Union Languages | 0 | - | 4.97 | 239,076 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,235 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,502 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,204 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,914 |
| History of Austria | 0 | - | 4.70 | 17,923 |
| Geography of the French Empire | 0 | - | 4.45 | 27,168 |
| The French Revolution | 0 | - | 4.47 | 24,077 |
| History of France | 0 | - | 4.61 | 57,346 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,088 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,114 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,968 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,866 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,944 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,461 |
| Byzantine History | 0 | - | 4.91 | 28,940 |
| Byzantine Emperors | 0 | - | 4.92 | 14,412 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,323 |
| History of The Netherlands | 0 | - | 4.46 | 17,499 |
| The Vikings! | 0 | - | 4.46 | 28,375 |
| The Portuguese Empire | 0 | - | 4.58 | 12,087 |
| Arthurian Legend | 0 | - | 4.33 | 25,136 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,424 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,970 |
| Geography of the British Empire | 0 | - | 4.48 | 39,769 |
| Medieval English History | 0 | - | 4.53 | 43,591 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,450,060 |
| Asia Map Quiz | 0 | - | 4.99 | 920,592 |
| History of Iran | 0 | - | 4.66 | 16,390 |
| Vietnam War Countries | 0 | - | 4.82 | 94,404 |
| Chinese Inventions | 0 | - | 4.30 | 33,828 |
| History of China | 0 | - | 4.37 | 57,374 |
| History of India | 0 | - | 4.62 | 21,468 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,544 |
| Africa Map Quiz | 0 | - | 5.00 | 2,122,966 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,579 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,909 |
| Countries by Founding Story | 0 | - | 4.95 | 77,442 |
| Independence from Whom | 0 | - | 4.99 | 212,292 |
| Political Movements by Country | 0 | - | 4.46 | 72,653 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,870 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,644 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 51,034 |
| Australian States and Territories | 0 | - | 4.96 | 142,360 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,385 |
| Australia Map Quiz | 0 | - | 4.95 | 345,389 |
| Australia True or False | 0 | - | 4.87 | 56,992 |
| Flags of North and South America | 0 | - | 4.99 | 374,825 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,752 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 144,463 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 130,209 |
| South America Map Quiz | 0 | - | 5.00 | 1,552,400 |
| Uruguay Country Quiz | 0 | - | 4.84 | 31,655 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,026,825 |
| North America Map Quiz | 0 | - | 4.98 | 249,772 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,835 |
| Arms Exports - United States | 0 | - | 4.77 | 62,563 |
| U.S. States by Governor | 0 | - | 4.43 | 18,084 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,722 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,408 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,720 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,505 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 630,923 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,552 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,218 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,125 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,782 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,620 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,670 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,380 |
| The Kennedy Family | 0 | - | 3.90 | 14,084 |
| American Founding Fathers | 0 | - | 4.42 | 23,248 |
| People on Money - United States | 0 | - | 4.31 | 63,385 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,527 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,147 |
