| Prime Ministers of the UK | 0 | - | 4.95 | 441,601 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,720,051 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,497 |
| Vietnam War Countries | 0 | - | 4.82 | 94,522 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,160 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,126 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,554 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,151 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,237 |
| The American Revolution | 0 | - | 4.52 | 54,329 |
| The Dictator Files: Saddam Hussein | 0 | - | 4.48 | 15,915 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,119 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,736 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,519 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,082 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,829 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,433 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,550 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,774 |
| Countries of the Popes | 0 | - | 4.79 | 128,595 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,439 |
| Flags of Countries that Border China | 0 | - | 4.94 | 100,001 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,235 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,151 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,487 |
| Presidential Middle Names | 0 | - | 4.41 | 60,637 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,248 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,582 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,839 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,592 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,447 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,773 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.30 | 53,716 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,617 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,797 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,220 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,432 |
| Flags of WW1 | 0 | - | 4.60 | 38,621 |
| Top 10 Oldest African Countries | 0 | - | 4.88 | 28,167 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,643 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,166 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,140 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,863 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,553 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,671 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,428 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,364 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,397 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 137,131 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,054 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,583 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,818 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,343 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,738 |
| First Ladies of the United States | 0 | - | 4.28 | 85,896 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,041 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,291 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,405 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,328 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,072 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,599 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,919 |
| Name that Greek Letter | 0 | - | 4.93 | 324,736 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,543 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,288 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,751 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,523 |
| Name the English Monarchs | 0 | - | 4.91 | 505,599 |
| Pope Facts | 0 | - | 4.39 | 31,353 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,344 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,800 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,737 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,977 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,044 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,366 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,608 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,981 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,925 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,911 |
| Arms Exports - United States | 0 | - | 4.77 | 62,654 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,702 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,913 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,893 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,161 |
| The Trojan War | 0 | - | 4.83 | 39,942 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,732 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,217 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,506 |
| Roman Emperors | 0 | - | 4.95 | 120,960 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,937 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,821 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,111 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,404 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,107 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,267 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,763 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,820 |
| National Founders | 0 | - | 4.40 | 83,937 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 49,001 |
| The Dictator Files: Fidel Castro | 0 | - | 4.19 | 12,381 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,132 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,854 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,983 |
| The George Washington Presidency | 0 | - | 4.03 | 14,595 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,769 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,736 |
| The John Adams Presidency | 0 | - | 4.12 | 8,777 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,976 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,765 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,369 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,746 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,478 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,908 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,119 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,344 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,560 |
| History of Russia Quiz | 0 | - | 4.47 | 31,988 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,177 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,419 |
| Countries of the German Empire | 0 | - | 4.51 | 38,121 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 75,040 |
| Ancient Greek Words | 0 | - | 4.93 | 112,289 |
| History of Italy | 0 | - | 4.55 | 32,117 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,790 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,399 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,053 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,123 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,210 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,734 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,894 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,686 |
| Communist Countries in History | 0 | - | 4.63 | 497,603 |
| History of South Africa | 0 | - | 4.60 | 17,745 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,105 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 634,067 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,586 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,259 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,893 |
| U.S. President Scramble | 0 | - | 4.40 | 117,366 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,308 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,053 |
| American Revolution Decoder | 0 | - | 4.12 | 20,982 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,414 |
| Europe Map Quiz | 0 | - | 5.00 | 4,781,930 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,933 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,145 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,887 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 216,071 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,343 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,058 |
| History of Austria | 0 | - | 4.70 | 17,959 |
| Geography of the French Empire | 0 | - | 4.45 | 27,201 |
| The French Revolution | 0 | - | 4.47 | 24,120 |
| History of France | 0 | - | 4.61 | 57,500 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,548 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,187 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,012 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,934 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,469 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,574 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,397 |
| Byzantine History | 0 | - | 4.91 | 28,997 |
| Byzantine Emperors | 0 | - | 4.93 | 14,525 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,557 |
| The Vikings! | 0 | - | 4.46 | 28,396 |
| The Portuguese Empire | 0 | - | 4.58 | 12,096 |
| Arthurian Legend | 0 | - | 4.33 | 25,161 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,440 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,143 |
| Geography of the British Empire | 0 | - | 4.48 | 39,822 |
| Medieval English History | 0 | - | 4.53 | 43,626 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,645 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,372 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,582 |
| Top 10 Richest Countries in Asia | 0 | - | 4.69 | 106,336 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,480 |
| History of Iran | 0 | - | 4.66 | 16,409 |
| The Iraq War | 0 | - | 4.47 | 15,696 |
| History of China | 0 | - | 4.35 | 57,498 |
| History of India | 0 | - | 4.62 | 21,493 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,613 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,102 |
| Political Movements by Country | 0 | - | 4.46 | 72,713 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,311 |
| European Countries Ending in "IA" | 0 | - | 4.96 | 68,880 |
| Oceania Map Quiz | 0 | - | 4.98 | 658,246 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 51,320 |
| Australian States and Territories | 0 | - | 4.96 | 142,678 |
| Australian Capitals | 0 | - | 4.92 | 62,811 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,453 |
| Australia Map Quiz | 0 | - | 4.95 | 345,863 |
| Australia True or False | 0 | - | 4.87 | 57,087 |
| Flags of North and South America | 0 | - | 4.99 | 376,092 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,883 |
| Top 10 Most Populous American Countries | 0 | - | 4.96 | 144,666 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 130,460 |
| History of Mexico | 0 | - | 4.52 | 15,358 |
| South America Map Quiz | 0 | - | 5.00 | 1,554,633 |
| Uruguay Country Quiz | 0 | - | 4.84 | 31,719 |
| Central America and Caribbean Map Quiz | 0 | - | 4.89 | 904,387 |
