| Prime Ministers of the UK | 0 | - | 4.96 | 434,678 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,685 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,050 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,257 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,267 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,654,936 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,000 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,575 |
| National Founders | 0 | - | 4.40 | 83,652 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,687 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,441 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,345 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,788 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,593 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,959 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,437 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,424 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,123 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,023 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,619 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,801 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,877 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,680 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,148 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,638 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,525 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,863 |
| Political Movements by Country | 0 | - | 4.46 | 72,262 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,909 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,866 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,368 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,740 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,529 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,268 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,959 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,298 |
| Name the English Monarchs | 0 | - | 4.92 | 497,955 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,165 |
| Countries of the Popes | 0 | - | 4.79 | 127,228 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,279 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,804 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,820 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,688 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,184 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,883 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,377 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,670 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,269 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,381 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,160 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,113 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,976 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,982 |
| Name that Greek Letter | 0 | - | 4.94 | 321,692 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,717 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,284 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,361 |
| Hindu Countries | 0 | - | 4.86 | 49,587 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,546 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,949 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,961 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,565 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,289 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,785 |
| The Trojan War | 0 | - | 4.83 | 39,431 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,543 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,307 |
| History of Italy | 0 | - | 4.55 | 31,817 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,054 |
| Roman Emperors | 0 | - | 4.95 | 118,496 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,483 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,982 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,506 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,407 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,519 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,114 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,626 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,689 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,221 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,184 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,814 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,735 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,457 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,977 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,949 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,957 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,509 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,006 |
| Presidential Middle Names | 0 | - | 4.41 | 59,714 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,744 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,824 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,747 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,176 |
| The American Revolution | 0 | - | 4.52 | 54,058 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,649 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,749 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,480 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,686 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,228 |
| Ancient Greek Words | 0 | - | 4.92 | 110,709 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,315 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,686 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,927 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,542 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,549 |
| History of India | 0 | - | 4.61 | 21,287 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,456 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,415 |
| History of South Africa | 0 | - | 4.60 | 17,602 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,365 |
| Australian Capitals | 0 | - | 4.92 | 62,594 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,074 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,464 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,807 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,168 |
| First Ladies of the United States | 0 | - | 4.28 | 85,247 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,112 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,300 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,390 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,002 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,428 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,837 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,567 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,521 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,690 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,585 |
| Official European Union Languages | 0 | - | 4.97 | 236,606 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,708 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,229 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,422 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,754 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,360 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,850 |
| History of Austria | 0 | - | 4.70 | 17,749 |
| Geography of the French Empire | 0 | - | 4.48 | 26,936 |
| The French Revolution | 0 | - | 4.46 | 23,785 |
| History of France | 0 | - | 4.59 | 56,060 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,384 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,934 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,585 |
| The Vikings! | 0 | - | 4.46 | 28,246 |
| The Portuguese Empire | 0 | - | 4.54 | 11,991 |
| Arthurian Legend | 0 | - | 4.33 | 25,050 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,394 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,180 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,787 |
| Geography of the British Empire | 0 | - | 4.48 | 39,475 |
| Pope Facts | 0 | - | 4.39 | 31,043 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,542 |
| Asia Map Quiz | 0 | - | 4.99 | 907,108 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,779 |
| History of Iran | 0 | - | 4.65 | 16,272 |
| The Vietnam War | 0 | - | 4.43 | 35,297 |
| History of China | 0 | - | 4.37 | 56,695 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,023 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,170 |
| Countries by Founding Story | 0 | - | 4.95 | 76,544 |
| Communist Countries in History | 0 | - | 4.63 | 492,548 |
| Independence from Whom | 0 | - | 4.99 | 209,698 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,757 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,000 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,179 |
| Countries of Africa | 0 | - | 5.00 | 2,508,140 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,822 |
| African East Coast | 0 | - | 4.96 | 95,059 |
| Western Africa Map Quiz | 0 | - | 4.97 | 72,932 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 49,808 |
| Australia Map Quiz | 0 | - | 4.94 | 342,508 |
| History of Mexico | 0 | - | 4.58 | 15,231 |
| United States Map Quiz | 0 | - | 4.98 | 4,142,015 |
| American Political Words | 0 | - | 4.39 | 23,341 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,816 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 210,165 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,214 |
| Countries That Use the Euro | 0 | - | 4.96 | 103,010 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,322 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,543 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,574 |
| The Only European Country ... | 0 | - | 4.91 | 213,862 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,554 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,553 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,242 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,780 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,771 |
| Mythology A-Z | 0 | - | 4.31 | 37,003 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,973 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,736 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,481 |
| History of The Netherlands | 0 | - | 4.46 | 17,311 |
| Countries that Beat Switzerland | 0 | - | 4.88 | 41,569 |
| Medieval English History | 0 | - | 4.53 | 43,323 |
| Asia Capitals Quiz | 0 | - | 4.98 | 685,975 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,783 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 97,480 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,184 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,276 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,375,965 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,493 |
| The Iraq War | 0 | - | 4.47 | 15,556 |
