| Prime Ministers of the UK | 0 | - | 4.95 | 437,230 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,682,033 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,337 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,749 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,351 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,768 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,759 |
| Countries of the Popes | 0 | - | 4.79 | 127,746 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,460 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,046 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,415 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,090 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,454 |
| Presidential Middle Names | 0 | - | 4.41 | 60,020 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,727 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,089 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,329 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,312 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 31,828 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,672 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,933 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,638 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,018 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,891 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,030 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,044 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,720 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,001 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,141 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,605 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,495 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,399 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,488 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,295 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,747 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,858 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,220 |
| First Ladies of the United States | 0 | - | 4.28 | 85,443 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,177 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,815 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,115 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,909 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,308 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,759 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,355 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,985 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,066 |
| Name the English Monarchs | 0 | - | 4.91 | 500,847 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,858 |
| National Founders | 0 | - | 4.40 | 83,768 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,545 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,489 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,898 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,417 |
| The Trojan War | 0 | - | 4.83 | 39,615 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 645,426 |
| Name that Greek Letter | 0 | - | 4.93 | 322,862 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,381 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,359 |
| Roman Emperors | 0 | - | 4.95 | 119,511 |
| Pope Facts | 0 | - | 4.39 | 31,164 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,277 |
| Australia by Picture | 0 | - | 4.41 | 28,548 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,578 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,701 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,589 |
| The John Adams Presidency | 0 | - | 4.12 | 8,719 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,719 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,821 |
| The American Revolution | 0 | - | 4.52 | 54,180 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,290 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,115 |
| History of Russia Quiz | 0 | - | 4.49 | 31,865 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,742 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,197 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,086 |
| Ancient Greek Words | 0 | - | 4.93 | 111,227 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,313 |
| History of Italy | 0 | - | 4.55 | 31,920 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,598 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,141 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,667 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,770 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,016 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,899 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,922 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,656 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,423 |
| The George Washington Presidency | 0 | - | 4.03 | 14,519 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,910 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,284 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,645 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,772 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,042 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,633 |
| Europe Map Quiz | 0 | - | 5.00 | 4,750,779 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,879 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 211,598 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,875 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,090 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,648 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,343 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,367 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,487 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 37,547 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,446 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,752 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,109 |
| Communist Countries in History | 0 | - | 4.63 | 494,477 |
| History of India | 0 | - | 4.61 | 21,378 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,361 |
| Africa Map Quiz | 0 | - | 5.00 | 2,112,809 |
| History of South Africa | 0 | - | 4.60 | 17,652 |
| Oceania Map Quiz | 0 | - | 4.98 | 639,565 |
| Australian Capitals | 0 | - | 4.92 | 62,683 |
| Biggest Cities in Australia on a Map | 0 | - | 4.61 | 37,779 |
| History of Mexico | 0 | - | 4.58 | 15,286 |
| United States Map Quiz | 0 | - | 4.98 | 4,150,718 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,891 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,038 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,738 |
| U.S. President Scramble | 0 | - | 4.40 | 116,557 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,112 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,814 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,012 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 68,928 |
| Official European Union Languages | 0 | - | 4.97 | 237,921 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,484 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 427,047 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,864 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,549 |
| History of Austria | 0 | - | 4.70 | 17,822 |
| Geography of the French Empire | 0 | - | 4.45 | 27,013 |
| The French Revolution | 0 | - | 4.46 | 23,884 |
| History of France | 0 | - | 4.59 | 56,732 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,450 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,094 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,898 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,862 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,175 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,196 |
| Byzantine History | 0 | - | 4.91 | 28,734 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,337 |
| History of The Netherlands | 0 | - | 4.46 | 17,386 |
| The Vikings! | 0 | - | 4.46 | 28,306 |
| The Portuguese Empire | 0 | - | 4.58 | 12,041 |
| Arthurian Legend | 0 | - | 4.33 | 25,089 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,289 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,212 |
| Geography of the British Empire | 0 | - | 4.48 | 39,615 |
| Medieval English History | 0 | - | 4.53 | 43,432 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,445,283 |
| Asia Map Quiz | 0 | - | 4.99 | 912,742 |
| History of Iran | 0 | - | 4.66 | 16,325 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,090 |
| Vietnam War Countries | 0 | - | 4.83 | 93,977 |
| Chinese Inventions | 0 | - | 4.30 | 33,772 |
| History of China | 0 | - | 4.37 | 56,982 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,790 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,521 |
| Countries by Founding Story | 0 | - | 4.95 | 76,974 |
| Independence from Whom | 0 | - | 4.99 | 211,079 |
| Political Movements by Country | 0 | - | 4.46 | 72,425 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,528 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,302 |
| Countries of Africa | 0 | - | 5.00 | 2,526,068 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,789 |
| Flags of Africa Quiz | 0 | - | 5.00 | 468,074 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,447 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 216,462 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 116,043 |
| 10 Northernmost Countries in Africa | 0 | - | 4.98 | 160,861 |
| Top 10 Smallest African Countries by Area | 0 | - | 4.96 | 32,964 |
| African East Coast | 0 | - | 4.96 | 95,672 |
| African Countries with the Shortest Names | 0 | - | 4.98 | 152,979 |
| Western Africa Map Quiz | 0 | - | 4.97 | 73,506 |
| Top African Languages on a Map | 0 | - | 4.92 | 73,442 |
| African Island Countries | 0 | - | 4.96 | 101,302 |
| Countries of Africa with an Empty Map | 0 | - | 5.00 | 242,883 |
| All First-Level Subdivisions of Africa on a Map | 0 | - | 4.92 | 33,055 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,361 |
| Australian States and Territories | 0 | - | 4.96 | 141,523 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,189 |
| Australia Map Quiz | 0 | - | 4.95 | 343,563 |
| Australia True or False | 0 | - | 4.87 | 56,731 |
| Flags of North and South America | 0 | - | 4.99 | 371,155 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,469 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 143,684 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 129,094 |
| South America Map Quiz | 0 | - | 5.00 | 1,546,088 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,019,038 |
| North America Map Quiz | 0 | - | 4.98 | 247,218 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,606 |
| Arms Exports - United States | 0 | - | 4.75 | 62,164 |
| U.S. States by Governor | 0 | - | 4.43 | 18,028 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,638 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,304 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,626 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,184 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 624,069 |
