| Prime Ministers of the UK | 0 | - | 4.96 | 434,529 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,674 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,033 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,221 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,229 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,652,967 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,998 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,572 |
| National Founders | 0 | - | 4.40 | 83,645 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,671 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,414 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,292 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,593 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,506 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,903 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,388 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,359 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,081 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,990 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,610 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,718 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,789 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,655 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,132 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,629 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,513 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,851 |
| Political Movements by Country | 0 | - | 4.46 | 72,254 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,844 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,850 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,345 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,732 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,508 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,213 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,938 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,226 |
| Name the English Monarchs | 0 | - | 4.92 | 497,781 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,117 |
| Countries of the Popes | 0 | - | 4.79 | 127,184 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,215 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,772 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,817 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,651 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,164 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,878 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,374 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,669 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,220 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,271 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,124 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,095 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,944 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,745 |
| Name that Greek Letter | 0 | - | 4.94 | 321,615 |
| Every Asian Country Shape | 0 | - | 4.95 | 86,667 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,255 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,314 |
| Hindu Countries | 0 | - | 4.85 | 49,548 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,485 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,930 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,946 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,366 |
| History of Russia Quiz | 0 | - | 4.49 | 31,788 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,284 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,759 |
| The Trojan War | 0 | - | 4.83 | 39,422 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,504 |
| 101 Figures from Greek Mythology | 0 | - | 5.00 | 124,235 |
| History of Italy | 0 | - | 4.55 | 31,812 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,035 |
| Roman Emperors | 0 | - | 4.95 | 118,431 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,477 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,978 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,503 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,379 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,490 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,075 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,612 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,671 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,193 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,168 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,768 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,703 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,409 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,969 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,890 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,923 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,454 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,991 |
| Presidential Middle Names | 0 | - | 4.41 | 59,688 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,718 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,800 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,733 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,161 |
| The American Revolution | 0 | - | 4.52 | 54,049 |
| Europe Map Quiz | 0 | - | 5.00 | 4,730,363 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,737 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,439 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,669 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,871 |
| Ancient Greek Words | 0 | - | 4.92 | 110,654 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,308 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,657 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,886 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,536 |
| Flags of Countries that Border China | 0 | - | 4.94 | 98,520 |
| History of India | 0 | - | 4.61 | 21,278 |
| Africa Map Quiz | 0 | - | 5.00 | 2,103,946 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,398 |
| History of South Africa | 0 | - | 4.60 | 17,599 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,145 |
| Australian Capitals | 0 | - | 4.92 | 62,592 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,073 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,460 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,806 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,163 |
| First Ladies of the United States | 0 | - | 4.28 | 85,230 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,110 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,261 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,323 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,998 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,383 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,829 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,476 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,454 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,681 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,570 |
| Official European Union Languages | 0 | - | 4.97 | 236,484 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,681 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,110 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,410 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,682 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,319 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,801 |
| History of Austria | 0 | - | 4.70 | 17,743 |
| Geography of the French Empire | 0 | - | 4.48 | 26,923 |
| The French Revolution | 0 | - | 4.46 | 23,777 |
| History of France | 0 | - | 4.59 | 56,001 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,382 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,927 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,439 |
| The Vikings! | 0 | - | 4.45 | 28,244 |
| The Portuguese Empire | 0 | - | 4.54 | 11,989 |
| Arthurian Legend | 0 | - | 4.33 | 25,049 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,390 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,167 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,758 |
| Geography of the British Empire | 0 | - | 4.48 | 39,467 |
| Pope Facts | 0 | - | 4.39 | 31,034 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,439,578 |
| Asia Map Quiz | 0 | - | 4.99 | 906,808 |
| Random Asian Countries on a Map | 0 | - | 4.90 | 168,724 |
| History of Iran | 0 | - | 4.65 | 16,270 |
| The Vietnam War | 0 | - | 4.43 | 35,288 |
| History of China | 0 | - | 4.37 | 56,683 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,880 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,144 |
| Countries by Founding Story | 0 | - | 4.95 | 76,509 |
| Communist Countries in History | 0 | - | 4.63 | 492,430 |
| Independence from Whom | 0 | - | 4.99 | 209,628 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,707 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,986 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,161 |
| Countries of Africa | 0 | - | 5.00 | 2,507,015 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,794 |
| African East Coast | 0 | - | 4.96 | 95,018 |
| Western Africa Map Quiz | 0 | - | 4.97 | 72,903 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 49,777 |
| Australia Map Quiz | 0 | - | 4.94 | 342,430 |
| History of Mexico | 0 | - | 4.58 | 15,229 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,322 |
| American Political Words | 0 | - | 4.39 | 23,339 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,812 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 210,072 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,190 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,924 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,263 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,527 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,497 |
| The Only European Country ... | 0 | - | 4.91 | 213,753 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,482 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,528 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,219 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,765 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,765 |
| Mythology A-Z | 0 | - | 4.31 | 36,991 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,890 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,719 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,447 |
| History of The Netherlands | 0 | - | 4.46 | 17,307 |
| Countries that Beat Switzerland | 0 | - | 4.88 | 41,558 |
| Medieval English History | 0 | - | 4.53 | 43,312 |
| Asia Capitals Quiz | 0 | - | 4.98 | 685,674 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 65,782 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 97,438 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,176 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,242 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,375,674 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,489 |
| The Iraq War | 0 | - | 4.47 | 15,549 |
