| Prime Ministers of the UK | 0 | - | 4.95 | 442,232 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,194 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,921 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,131 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,235 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,750 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,725,193 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,691 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,826 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,926 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,621 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,550 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,190 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,508 |
| National Founders | 0 | - | 4.40 | 83,973 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,469 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,567 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,496 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,812 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,774 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,859 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,345 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,342 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,741 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,819 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,552 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,928 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,438 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,470 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,563 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,143 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,093 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,673 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,644 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,723 |
| Name the English Monarchs | 0 | - | 4.91 | 506,297 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,906 |
| Countries of the Popes | 0 | - | 4.79 | 128,725 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,962 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,637 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,066 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,507 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,089 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,320 |
| Political Movements by Country | 0 | - | 4.46 | 72,769 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,000 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,144 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,595 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,861 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,761 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,744 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,181 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,294 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,059 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,645 |
| The Trojan War | 0 | - | 4.83 | 39,982 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,781 |
| Name that Greek Letter | 0 | - | 4.93 | 324,953 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,929 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,581 |
| Roman Emperors | 0 | - | 4.95 | 121,177 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,648 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,381 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,859 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,595 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,496 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,022 |
| China by Picture | 0 | - | 4.51 | 63,696 |
| Countries that Beat China | 0 | - | 4.85 | 116,726 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,771 |
| Countries that Border China | 0 | - | 4.96 | 264,250 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,837 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,519 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,194 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,243 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,732 |
| Hindu Countries | 0 | - | 4.87 | 50,570 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,986 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,537 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,553 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,318 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,620 |
| Presidential Middle Names | 0 | - | 4.41 | 60,722 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,687 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,895 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,195 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,629 |
| The American Revolution | 0 | - | 4.52 | 54,356 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,279 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,138 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,006 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,676 |
| Ancient Greek Words | 0 | - | 4.93 | 112,439 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,516 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,567 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,804 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,988 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,960 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,985 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,139 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,382 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,105 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,563 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,969 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,362 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,768 |
| First Ladies of the United States | 0 | - | 4.28 | 85,949 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,313 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,464 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,193 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,360 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,579 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,097 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 58,736 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,424 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,576 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,943 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,150 |
| Europe Map Quiz | 0 | - | 5.00 | 4,787,486 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 532,447 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,180 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,347 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,414 |
| History of Russia Quiz | 0 | - | 4.47 | 32,003 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,541 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,609 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,336 |
| History of Italy | 0 | - | 4.55 | 32,142 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,729 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,817 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,420 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,093 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,807 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,022 |
| Pope Facts | 0 | - | 4.39 | 31,383 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,256 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,962 |
| The Vietnam War | 0 | - | 4.44 | 35,652 |
| Japan by Picture | 0 | - | 4.45 | 29,418 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,751 |
| Communist Countries in History | 0 | - | 4.63 | 498,139 |
| History of South Africa | 0 | - | 4.60 | 17,763 |
| Oceania Map Quiz | 0 | - | 4.98 | 659,257 |
| Australian Capitals | 0 | - | 4.92 | 62,828 |
| History of Mexico | 0 | - | 4.52 | 15,364 |
| United States Map Quiz | 0 | - | 4.98 | 4,171,072 |
| American Political Words | 0 | - | 4.39 | 23,471 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,215 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,563 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.22 | 10,905 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,608 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,279 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.42 | 24,066 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,918 |
| U.S. President Scramble | 0 | - | 4.40 | 117,457 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,344 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,080 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,707 |
| Official European Union Languages | 0 | - | 4.97 | 239,761 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,617 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,821 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,928 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 216,639 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,414 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,139 |
| History of Austria | 0 | - | 4.70 | 17,971 |
| Geography of the French Empire | 0 | - | 4.45 | 27,216 |
| The French Revolution | 0 | - | 4.47 | 24,146 |
| History of France | 0 | - | 4.61 | 57,595 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,558 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,232 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,041 |
| Mythology A-Z | 0 | - | 4.31 | 37,392 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,962 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,807 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,455 |
| Byzantine History | 0 | - | 4.91 | 29,020 |
| Byzantine Emperors | 0 | - | 4.93 | 14,587 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,902 |
| History of The Netherlands | 0 | - | 4.46 | 17,550 |
| The Vikings! | 0 | - | 4.46 | 28,403 |
| The Portuguese Empire | 0 | - | 4.58 | 12,105 |
| Arthurian Legend | 0 | - | 4.33 | 25,174 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,460 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,240 |
| Geography of the British Empire | 0 | - | 4.48 | 39,845 |
| Medieval English History | 0 | - | 4.53 | 43,654 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,650 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,452,409 |
| Asia Map Quiz | 0 | - | 4.99 | 925,008 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,662 |
| Most Guessed Asian Capitals | 0 | - | 4.51 | 66,030 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,634 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,582 |
| History of Iran | 0 | - | 4.66 | 16,424 |
| The Iraq War | 0 | - | 4.47 | 15,704 |
| Vietnam War Countries | 0 | - | 4.82 | 94,606 |
| Chinese Inventions | 0 | - | 4.30 | 33,860 |
| History of China | 0 | - | 4.35 | 57,573 |
| Most Visited Countries by Chinese People | 0 | - | 4.41 | 55,774 |
