| U.S. Presidents Quiz | 0 | - | 5.00 | 3,708,655 |
| Mythical Creatures Quiz #1 | 0 | - | 4.92 | 708,585 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,915 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,920 |
| Name the English Monarchs | 0 | - | 4.91 | 503,978 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,083 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,038 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,085 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,328 |
| Name that Greek Letter | 0 | - | 4.93 | 324,178 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,693 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,384 |
| Countries in World War I | 0 | - | 4.88 | 228,479 |
| Independence from Whom | 0 | - | 4.99 | 212,149 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,732 |
| Most Populous Countries in 1900 | 0 | - | 4.91 | 173,920 |
| Countries of the World in 1914 with a Map | 0 | - | 4.99 | 195,773 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,805 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 193,884 |
| Biggest US Cities by Decade | 0 | - | 4.95 | 168,561 |
| Recently Independent Countries | 0 | - | 4.98 | 159,492 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,732 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,613 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,653 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,760 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,780 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,864 |
| Biggest European Cities by Century | 0 | - | 4.99 | 145,784 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,403 |
| Countries of the World in 1945 with a Map | 0 | - | 5.00 | 151,341 |
| Countries Settled by Vikings | 0 | - | 4.93 | 121,768 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,983 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 126,223 |
| First Countries to Reach 5 Million People | 0 | - | 4.93 | 135,518 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,686 |
| Biggest English Cities by Century | 0 | - | 4.90 | 106,476 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,991 |
| WWI... or WWII? | 0 | - | 4.85 | 142,638 |
| Roman Emperors | 0 | - | 4.95 | 120,404 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,269 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,371 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,092 |
| Countries by Former Name | 0 | - | 4.99 | 125,365 |
| Countries of Europe in 1444 | 0 | - | 4.92 | 100,056 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,565 |
| Former Flags | 0 | - | 4.97 | 107,982 |
| Most Populous Modern-Day Countries by Century | 0 | - | 4.98 | 97,418 |
| Warsaw Pact Countries | 0 | - | 4.83 | 84,570 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,096 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,500 |
| Metals of Antiquity | 0 | - | 4.95 | 93,615 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,011 |
| Biggest Cities in Europe in 1700 | 0 | - | 4.93 | 71,169 |
| Former Countries by Territory Map | 0 | - | 4.96 | 103,119 |
| Most Populous Modern-Day Countries in 1 AD | 0 | - | 4.98 | 92,926 |
| Historical City to Country | 0 | - | 4.84 | 78,642 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,858 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,998 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,420 |
| Most Populous Modern-Day Countries in 1000 AD | 0 | - | 4.88 | 76,307 |
| Empires by Maps | 0 | - | 4.98 | 120,965 |
| Military History Vocabulary | 0 | - | 4.91 | 67,302 |
| Most Populous Modern-Day Countries in 1500 AD | 0 | - | 4.93 | 73,647 |
| 25 Biggest Cities of the Soviet Union | 0 | - | 4.94 | 84,644 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,800 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,267 |
| Countries of the World in 1900 | 0 | - | 4.89 | 85,273 |
| Flags of Countries of the World in 1910 | 0 | - | 4.96 | 79,063 |
| Most Populous Modern-Day Countries in 1800 AD | 0 | - | 4.93 | 67,342 |
| Biggest Cities once in the Spanish Empire | 0 | - | 4.87 | 56,304 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,111 |
| Ultimate 20th Century History Quiz | 0 | - | 4.87 | 53,884 |
| Modern-Day Countries of the Inca Empire on a Map | 0 | - | 4.83 | 57,589 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,605 |
| Countries by Founding Story | 0 | - | 4.95 | 77,390 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,651 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,872 |
| Name a Valid Year in History | 0 | - | 4.93 | 67,480 |
| Battle to Country | 0 | - | 4.91 | 53,536 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,851 |
| The Trojan War | 0 | - | 4.83 | 39,799 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,279 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,198 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,187 |
| Countries in World War II | 0 | - | 4.54 | 914,855 |
| U.S. Baby Boy Names by Decade | 0 | - | 4.55 | 490,476 |
| Communist Countries in History | 0 | - | 4.63 | 496,547 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 338,155 |
| Famous Dictators #1 | 0 | - | 4.69 | 200,051 |
| Words for Leaders | 0 | - | 4.77 | 257,801 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,081 |
| Biggest Nations and Empires Ever | 0 | - | 4.46 | 146,205 |
| Ye Olde Professions | 0 | - | 4.63 | 157,037 |
| History by Letter - B | 0 | - | 4.45 | 172,761 |
| Current Events by Year, 1990–2009 | 0 | - | 4.77 | 152,710 |
| History by Letter - C | 0 | - | 4.70 | 172,038 |
| 40 Historical People that Everyone Should Know | 0 | - | 4.08 | 1,014,792 |
| U.S. Baby Girl Names by Decade | 0 | - | 4.42 | 713,922 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 388,742 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,378 |
| First Names of Historical Figures #1 | 0 | - | 4.39 | 229,577 |
| Name that Historical Figure #2 | 0 | - | 4.42 | 285,089 |
| World Leaders by Picture | 0 | - | 4.36 | 265,836 |
| Name the War | 0 | - | 4.37 | 202,354 |
| Name that Historical Figure #3 | 0 | - | 4.36 | 239,850 |
| Events in History #1 | 0 | - | 4.34 | 157,897 |
| WWII Trivia #1 | 0 | - | 4.36 | 178,009 |
| People Who Were "The" Something | 0 | - | 4.25 | 155,997 |
| Popular Royal Names | 0 | - | 4.27 | 125,081 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 159,486 |
| History by Letter - J | 0 | - | 4.51 | 154,507 |
| History by Letter - A | 0 | - | 4.51 | 153,445 |
| Former Countries | 0 | - | 4.75 | 133,933 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,764 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,672 |
| History by Letter - E | 0 | - | 4.51 | 141,050 |
| Roman to Greek God | 0 | - | 4.52 | 123,023 |
| Famous Empires by Description | 0 | - | 4.73 | 118,670 |
| Cities in European History #1 | 0 | - | 4.63 | 134,218 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 119,484 |
| WWII Geography | 0 | - | 4.81 | 120,570 |
| Ancient City to Country | 0 | - | 4.70 | 108,145 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,928 |
| History by Letter - G | 0 | - | 4.46 | 122,503 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,435 |
| History by Letter - M | 0 | - | 4.54 | 120,188 |
| Country by Photo of its Leader | 0 | - | 4.72 | 124,267 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 105,546 |
| WWII A-Z #1 | 0 | - | 4.73 | 103,126 |
| People in History A-Z #1 | 0 | - | 4.63 | 99,188 |
| Quotes from Historical Figures #1 | 0 | - | 4.50 | 87,564 |
| Most Populous Countries by Year | 0 | - | 4.83 | 110,885 |
| WWII Trivia #2 | 0 | - | 4.52 | 104,309 |
| Vietnam War Countries | 0 | - | 4.82 | 94,360 |
| The 20th Century | 0 | - | 4.46 | 97,671 |
| World War I Quiz | 0 | - | 4.78 | 101,451 |
| Notable People of WWII | 0 | - | 4.53 | 86,030 |
| Countries That Were Invaded | 0 | - | 4.55 | 97,563 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,670 |
| Famous Ancient Romans | 0 | - | 4.70 | 85,563 |
| Countries of the Popes | 0 | - | 4.79 | 128,345 |
| History Multiple Choice #1 | 0 | - | 4.41 | 82,079 |
| Ancient Greek Words | 0 | - | 4.93 | 111,916 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,655 |
| History General Knowledge #3 | 0 | - | 4.50 | 96,543 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,002 |
| Countries "Ruled" by King Charles III | 0 | - | 4.77 | 82,779 |
| Top 10 World Cities Through History | 0 | - | 4.43 | 78,166 |
| History Analogies #3 | 0 | - | 4.61 | 80,733 |
| Most Populous Countries in 1950 | 0 | - | 4.63 | 86,138 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,253 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,297 |
| Political Movements by Country | 0 | - | 4.46 | 72,622 |
| History Analogies #2 | 0 | - | 4.49 | 77,294 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,077 |
| The 7 Wonders of the Ancient World | 0 | - | 4.85 | 82,473 |
| Biggest Cities Once in the Roman Empire | 0 | - | 4.81 | 75,757 |
| The 21st Century | 0 | - | 4.47 | 106,153 |
| Biggest British Empire Countries | 0 | - | 4.74 | 100,192 |
| Former Capitals | 0 | - | 4.88 | 71,522 |
| Years in History #1 - Multiple Choice | 0 | - | 4.85 | 70,406 |
| First U.S. States to Reach 1 Million People | 0 | - | 4.69 | 79,353 |
| 2010s Decade Quiz | 0 | - | 4.53 | 103,088 |
| Political Figures by Last Name #1 | 0 | - | 4.56 | 68,199 |
| Biggest Cities in History | 0 | - | 4.52 | 90,307 |
| Time Magazine Person of the Year | 0 | - | 4.53 | 74,216 |
| The American Revolution | 0 | - | 4.52 | 54,294 |
| The Dictator Files: Adolf Hitler | 0 | - | 4.79 | 78,066 |
| Biggest World Cities in 1850 | 0 | - | 4.61 | 68,540 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,094 |
| Cities by Former Name | 0 | - | 4.83 | 91,733 |
| Current Events by Year, 1970–1989 | 0 | - | 4.56 | 65,228 |
| The 16th Century | 0 | - | 4.77 | 58,924 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,520 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,778 |
| The American Civil War | 0 | - | 4.62 | 52,502 |
| First U.S. Cities to Reach 100,000 People | 0 | - | 4.69 | 60,304 |
| WWII A-Z #2 | 0 | - | 4.44 | 54,749 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,898 |
| The 11th and 12th Century | 0 | - | 4.53 | 56,182 |
| Inventions by Country #1 | 0 | - | 4.47 | 55,089 |
| Famous Inventors | 0 | - | 4.44 | 43,562 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,451 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,405 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,549 |
| Answers by Time Period | 0 | - | 4.64 | 55,703 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,219 |
| The 18th Century | 0 | - | 4.53 | 53,356 |
| Medieval English History | 0 | - | 4.53 | 43,572 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,646 |
| Valid Answer - World History #1 | 0 | - | 4.56 | 61,976 |
| The 14th Century | 0 | - | 4.55 | 49,352 |
| Name a Valid Answer - World War II | 0 | - | 4.53 | 55,544 |
| People in History A-Z #3 | 0 | - | 4.44 | 46,260 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,993 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,868 |
| Modern Day Countries of the Portuguese Empire on a Map | 0 | - | 4.56 | 51,888 |
| Holy Roman Empire Countries | 0 | - | 4.77 | 54,837 |
| History of France | 0 | - | 4.59 | 57,277 |
| Countries by Independence Day | 0 | - | 4.61 | 52,781 |
