| Prime Ministers of the UK | 0 | - | 4.95 | 440,817 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,713,892 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,789 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,378 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,744 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,310 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,596 |
| Countries of the Popes | 0 | - | 4.79 | 128,459 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,560 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,111 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,059 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,902 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,275 |
| Presidential Middle Names | 0 | - | 4.41 | 60,519 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,798 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,519 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,743 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,543 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,280 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,552 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,349 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,721 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,704 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,443 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,100 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,013 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,643 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,923 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,159 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,315 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,478 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,277 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,529 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,995 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,651 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,307 |
| First Ladies of the United States | 0 | - | 4.28 | 85,804 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,264 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,327 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,280 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,042 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,406 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,888 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,652 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,411 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,174 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,621 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,241 |
| Name the English Monarchs | 0 | - | 4.91 | 504,754 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,641 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,210 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,864 |
| National Founders | 0 | - | 4.40 | 83,908 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,570 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,012 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,593 |
| The Trojan War | 0 | - | 4.83 | 39,886 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,910 |
| Name that Greek Letter | 0 | - | 4.93 | 324,429 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,488 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,324 |
| Roman Emperors | 0 | - | 4.95 | 120,663 |
| Pope Facts | 0 | - | 4.39 | 31,321 |
| Australia by Picture | 0 | - | 4.41 | 28,693 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,694 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,757 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,711 |
| The John Adams Presidency | 0 | - | 4.12 | 8,768 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,755 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,879 |
| The American Revolution | 0 | - | 4.52 | 54,306 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,199 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,920 |
| History of Russia Quiz | 0 | - | 4.47 | 31,975 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,890 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,766 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,449 |
| Ancient Greek Words | 0 | - | 4.93 | 112,097 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,836 |
| History of Italy | 0 | - | 4.55 | 32,093 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,756 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,343 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,888 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,005 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,661 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,024 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,350 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,623 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,370 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,741 |
| The George Washington Presidency | 0 | - | 4.03 | 14,577 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,956 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,344 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,726 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,344 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,722 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,850 |
| Europe Map Quiz | 0 | - | 5.00 | 4,776,114 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,090 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 215,301 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,926 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,048 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,363 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,274 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,803 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,746 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,033 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,996 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,880 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,432 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,831 |
| Communist Countries in History | 0 | - | 4.63 | 497,052 |
| History of South Africa | 0 | - | 4.60 | 17,729 |
| Oceania Map Quiz | 0 | - | 4.98 | 656,706 |
| Australian Capitals | 0 | - | 4.92 | 62,782 |
| Biggest Cities in Australia on a Map | 0 | - | 4.62 | 38,079 |
| History of Mexico | 0 | - | 4.58 | 15,344 |
| United States Map Quiz | 0 | - | 4.98 | 4,165,676 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,069 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,124 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,841 |
| U.S. President Scramble | 0 | - | 4.40 | 117,231 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,274 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,001 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,472 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,455 |
| Official European Union Languages | 0 | - | 4.97 | 239,204 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,297 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 429,741 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,240 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,943 |
| History of Austria | 0 | - | 4.70 | 17,929 |
| Geography of the French Empire | 0 | - | 4.45 | 27,181 |
| The French Revolution | 0 | - | 4.47 | 24,091 |
| History of France | 0 | - | 4.61 | 57,383 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,529 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,161 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,139 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,981 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,884 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,073 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,503 |
| Byzantine History | 0 | - | 4.91 | 28,960 |
| Byzantine Emperors | 0 | - | 4.92 | 14,440 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,404 |
| History of The Netherlands | 0 | - | 4.46 | 17,503 |
| The Vikings! | 0 | - | 4.46 | 28,383 |
| The Portuguese Empire | 0 | - | 4.58 | 12,088 |
| Arthurian Legend | 0 | - | 4.33 | 25,138 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,426 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,014 |
| Geography of the British Empire | 0 | - | 4.48 | 39,790 |
| Medieval English History | 0 | - | 4.53 | 43,604 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,450,401 |
| Asia Map Quiz | 0 | - | 4.99 | 921,571 |
| History of Iran | 0 | - | 4.66 | 16,390 |
| Vietnam War Countries | 0 | - | 4.82 | 94,447 |
| Chinese Inventions | 0 | - | 4.30 | 33,835 |
| History of China | 0 | - | 4.37 | 57,417 |
| History of India | 0 | - | 4.62 | 21,474 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,559 |
| Africa Map Quiz | 0 | - | 5.00 | 2,123,967 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,639 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,942 |
| Countries by Founding Story | 0 | - | 4.95 | 77,466 |
| Independence from Whom | 0 | - | 4.99 | 212,373 |
| Political Movements by Country | 0 | - | 4.46 | 72,663 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,944 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,667 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 51,086 |
| Australian States and Territories | 0 | - | 4.96 | 142,445 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,408 |
| Australia Map Quiz | 0 | - | 4.95 | 345,515 |
| Australia True or False | 0 | - | 4.87 | 57,017 |
| Flags of North and South America | 0 | - | 4.99 | 375,142 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,803 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 144,544 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 130,274 |
| South America Map Quiz | 0 | - | 5.00 | 1,552,831 |
| Uruguay Country Quiz | 0 | - | 4.84 | 31,673 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,027,409 |
| North America Map Quiz | 0 | - | 4.98 | 250,023 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,861 |
| Arms Exports - United States | 0 | - | 4.77 | 62,599 |
| U.S. States by Governor | 0 | - | 4.43 | 18,088 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,726 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,417 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,727 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,536 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 631,483 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,563 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,234 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,126 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,834 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,626 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,710 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,437 |
| The Kennedy Family | 0 | - | 3.90 | 14,084 |
| American Founding Fathers | 0 | - | 4.42 | 23,250 |
| People on Money - United States | 0 | - | 4.31 | 63,390 |
