| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,173 |
| Mythical Creatures Quiz #1 | 0 | - | 4.92 | 710,965 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,367 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,724 |
| Name the English Monarchs | 0 | - | 4.91 | 507,667 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,014 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,673 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,421 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,012 |
| Name that Greek Letter | 0 | - | 4.93 | 325,406 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,673 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,849 |
| Countries in World War I | 0 | - | 4.88 | 229,530 |
| Independence from Whom | 0 | - | 4.99 | 213,548 |
| Figures from Greek Mythology | 0 | - | 4.92 | 194,532 |
| Most Populous Countries in 1900 | 0 | - | 4.91 | 174,417 |
| Countries of the World in 1914 with a Map | 0 | - | 4.99 | 197,219 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,748 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.97 | 195,021 |
| Biggest US Cities by Decade | 0 | - | 4.95 | 169,401 |
| Recently Independent Countries | 0 | - | 4.98 | 160,586 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,749 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,125 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,691 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,649 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,612 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,808 |
| Biggest European Cities by Century | 0 | - | 4.99 | 146,300 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,769 |
| Countries of the World in 1945 with a Map | 0 | - | 5.00 | 152,609 |
| Countries Settled by Vikings | 0 | - | 4.92 | 122,217 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 146,158 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 127,135 |
| First Countries to Reach 5 Million People | 0 | - | 4.93 | 136,071 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.89 | 114,635 |
| Biggest English Cities by Century | 0 | - | 4.91 | 107,125 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,132 |
| WWI... or WWII? | 0 | - | 4.85 | 143,928 |
| Roman Emperors | 0 | - | 4.95 | 121,523 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,181 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,718 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,061 |
| Countries by Former Name | 0 | - | 4.99 | 126,040 |
| Countries of Europe in 1444 | 0 | - | 4.92 | 100,848 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,966 |
| Former Flags | 0 | - | 4.97 | 108,887 |
| Most Populous Modern-Day Countries by Century | 0 | - | 4.98 | 97,915 |
| Warsaw Pact Countries | 0 | - | 4.83 | 85,019 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,758 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 95,380 |
| Metals of Antiquity | 0 | - | 4.95 | 94,060 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,471 |
| Biggest Cities in Europe in 1700 | 0 | - | 4.93 | 71,532 |
| Former Countries by Territory Map | 0 | - | 4.96 | 104,301 |
| Most Populous Modern-Day Countries in 1 AD | 0 | - | 4.98 | 93,324 |
| Historical City to Country | 0 | - | 4.85 | 79,122 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,258 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,608 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,861 |
| Most Populous Modern-Day Countries in 1000 AD | 0 | - | 4.88 | 76,647 |
| Empires by Maps | 0 | - | 4.98 | 122,708 |
| Military History Vocabulary | 0 | - | 4.92 | 67,793 |
| Most Populous Modern-Day Countries in 1500 AD | 0 | - | 4.93 | 73,957 |
| 25 Biggest Cities of the Soviet Union | 0 | - | 4.94 | 85,007 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,141 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,583 |
| Countries of the World in 1900 | 0 | - | 4.89 | 86,285 |
| Flags of Countries of the World in 1910 | 0 | - | 4.96 | 79,647 |
| Most Populous Modern-Day Countries in 1800 AD | 0 | - | 4.93 | 67,593 |
| Biggest Cities once in the Spanish Empire | 0 | - | 4.87 | 56,631 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,688 |
| Ultimate 20th Century History Quiz | 0 | - | 4.87 | 54,278 |
| Modern-Day Countries of the Inca Empire on a Map | 0 | - | 4.83 | 58,024 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,962 |
| Countries by Founding Story | 0 | - | 4.95 | 77,952 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,843 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 47,254 |
| Name a Valid Year in History | 0 | - | 4.93 | 68,197 |
| Battle to Country | 0 | - | 4.91 | 54,163 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,497 |
| The Trojan War | 0 | - | 4.83 | 40,122 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,659 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,533 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,259 |
| Countries in World War II | 0 | - | 4.55 | 920,750 |
| U.S. Baby Boy Names by Decade | 0 | - | 4.55 | 492,636 |
| Communist Countries in History | 0 | - | 4.63 | 498,940 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 341,253 |
| Famous Dictators #1 | 0 | - | 4.69 | 200,817 |
| Words for Leaders | 0 | - | 4.77 | 259,346 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,092 |
| Biggest Nations and Empires Ever | 0 | - | 4.46 | 146,785 |
| Ye Olde Professions | 0 | - | 4.63 | 157,639 |
| History by Letter - B | 0 | - | 4.45 | 173,537 |
| Current Events by Year, 1990–2009 | 0 | - | 4.77 | 153,079 |
| History by Letter - C | 0 | - | 4.70 | 172,889 |
| 40 Historical People that Everyone Should Know | 0 | - | 4.08 | 1,017,301 |
| U.S. Baby Girl Names by Decade | 0 | - | 4.42 | 716,776 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 390,682 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,479 |
| First Names of Historical Figures #1 | 0 | - | 4.40 | 230,693 |
| Name that Historical Figure #2 | 0 | - | 4.42 | 287,605 |
| World Leaders by Picture | 0 | - | 4.36 | 267,170 |
| Name the War | 0 | - | 4.37 | 203,052 |
| Name that Historical Figure #3 | 0 | - | 4.37 | 249,458 |
| Events in History #1 | 0 | - | 4.35 | 158,274 |
| WWII Trivia #1 | 0 | - | 4.36 | 178,788 |
| People Who Were "The" Something | 0 | - | 4.25 | 156,509 |
| Popular Royal Names | 0 | - | 4.27 | 125,487 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 161,415 |
| History by Letter - J | 0 | - | 4.51 | 155,213 |
| History by Letter - A | 0 | - | 4.51 | 154,113 |
| Former Countries | 0 | - | 4.77 | 134,352 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,759 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,414 |
| History by Letter - E | 0 | - | 4.51 | 141,692 |
| Roman to Greek God | 0 | - | 4.52 | 123,566 |
| Famous Empires by Description | 0 | - | 4.74 | 119,092 |
| Cities in European History #1 | 0 | - | 4.63 | 134,976 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 120,030 |
| WWII Geography | 0 | - | 4.81 | 121,559 |
| Ancient City to Country | 0 | - | 4.72 | 108,422 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,709 |
| History by Letter - G | 0 | - | 4.46 | 123,245 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,133 |
| History by Letter - M | 0 | - | 4.54 | 120,844 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,782 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 106,163 |
| WWII A-Z #1 | 0 | - | 4.73 | 103,505 |
| People in History A-Z #1 | 0 | - | 4.63 | 99,841 |
| Quotes from Historical Figures #1 | 0 | - | 4.50 | 87,809 |
| Most Populous Countries by Year | 0 | - | 4.83 | 111,732 |
| WWII Trivia #2 | 0 | - | 4.52 | 104,748 |
| Vietnam War Countries | 0 | - | 4.82 | 94,786 |
| The 20th Century | 0 | - | 4.46 | 97,894 |
| World War I Quiz | 0 | - | 4.78 | 102,206 |
| Notable People of WWII | 0 | - | 4.53 | 86,662 |
| Countries That Were Invaded | 0 | - | 4.55 | 98,363 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,959 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,868 |
| Countries of the Popes | 0 | - | 4.78 | 128,949 |
| History Multiple Choice #1 | 0 | - | 4.41 | 82,427 |
| Ancient Greek Words | 0 | - | 4.93 | 112,739 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,730 |
| History General Knowledge #3 | 0 | - | 4.50 | 97,154 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,800 |
| Countries "Ruled" by King Charles III | 0 | - | 4.78 | 82,929 |
| Top 10 World Cities Through History | 0 | - | 4.43 | 79,260 |
| History Analogies #3 | 0 | - | 4.61 | 80,992 |
| Most Populous Countries in 1950 | 0 | - | 4.63 | 86,618 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,358 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,482 |
| Political Movements by Country | 0 | - | 4.46 | 72,852 |
| History Analogies #2 | 0 | - | 4.49 | 77,548 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,303 |
| The 7 Wonders of the Ancient World | 0 | - | 4.86 | 82,682 |
| Biggest Cities Once in the Roman Empire | 0 | - | 4.81 | 76,254 |
| The 21st Century | 0 | - | 4.47 | 106,567 |
| Biggest British Empire Countries | 0 | - | 4.74 | 100,644 |
| Former Capitals | 0 | - | 4.88 | 71,750 |
| Years in History #1 - Multiple Choice | 0 | - | 4.82 | 70,738 |
| First U.S. States to Reach 1 Million People | 0 | - | 4.69 | 79,622 |
| 2010s Decade Quiz | 0 | - | 4.53 | 103,931 |
| Political Figures by Last Name #1 | 0 | - | 4.56 | 68,860 |
| Biggest Cities in History | 0 | - | 4.52 | 90,740 |
| Time Magazine Person of the Year | 0 | - | 4.53 | 74,581 |
| The American Revolution | 0 | - | 4.52 | 54,403 |
| The Dictator Files: Adolf Hitler | 0 | - | 4.78 | 78,414 |
| Biggest World Cities in 1850 | 0 | - | 4.61 | 68,751 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,361 |
| Cities by Former Name | 0 | - | 4.83 | 92,225 |
| Current Events by Year, 1970–1989 | 0 | - | 4.56 | 65,375 |
| The 16th Century | 0 | - | 4.77 | 59,006 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,724 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,046 |
| The American Civil War | 0 | - | 4.62 | 52,676 |
| First U.S. Cities to Reach 100,000 People | 0 | - | 4.69 | 60,549 |
| WWII A-Z #2 | 0 | - | 4.44 | 54,962 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,544 |
| The 11th and 12th Century | 0 | - | 4.53 | 56,295 |
| Inventions by Country #1 | 0 | - | 4.47 | 55,216 |
| Famous Inventors | 0 | - | 4.44 | 43,623 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,691 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,498 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,853 |
| Answers by Time Period | 0 | - | 4.64 | 55,953 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,695 |
| The 18th Century | 0 | - | 4.53 | 53,470 |
| Medieval English History | 0 | - | 4.53 | 43,700 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,051 |
| Valid Answer - World History #1 | 0 | - | 4.56 | 62,228 |
| The 14th Century | 0 | - | 4.55 | 49,443 |
| Name a Valid Answer - World War II | 0 | - | 4.53 | 55,995 |
| People in History A-Z #3 | 0 | - | 4.44 | 46,504 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,282 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,287 |
| Modern Day Countries of the Portuguese Empire on a Map | 0 | - | 4.56 | 52,310 |
| Holy Roman Empire Countries | 0 | - | 4.77 | 54,945 |
| History of France | 0 | - | 4.61 | 57,765 |
| Countries by Independence Day | 0 | - | 4.62 | 52,888 |
