| Prime Ministers of the UK | 0 | - | 4.96 | 434,446 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,652,190 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,932 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,213 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,018 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,401 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,088 |
| Countries of the Popes | 0 | - | 4.79 | 127,160 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,523 |
| Paramount Leaders of China | 0 | - | 4.36 | 10,996 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,868 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,915 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,435 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,973 |
| Presidential Middle Names | 0 | - | 4.41 | 59,680 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,481 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,706 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,791 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,156 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,363 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,596 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,570 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,275 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,727 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,752 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,650 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,872 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,368 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,332 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,062 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,972 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,508 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,303 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,820 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,832 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,505 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,161 |
| First Ladies of the United States | 0 | - | 4.28 | 85,227 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,107 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,243 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,996 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,825 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,203 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,678 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,124 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,456 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,199 |
| Name the English Monarchs | 0 | - | 4.92 | 497,714 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,178 |
| National Founders | 0 | - | 4.40 | 83,642 |
| Australian Animals By Picture | 0 | - | 4.45 | 31,438 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,372 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,811 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,276 |
| The Trojan War | 0 | - | 4.83 | 39,419 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,627 |
| Name that Greek Letter | 0 | - | 4.94 | 321,550 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,481 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,022 |
| Roman Emperors | 0 | - | 4.95 | 118,407 |
| Pope Facts | 0 | - | 4.39 | 31,031 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,925 |
| Australia by Picture | 0 | - | 4.41 | 28,430 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,457 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,657 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,488 |
| The John Adams Presidency | 0 | - | 4.12 | 8,675 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,680 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,769 |
| The American Revolution | 0 | - | 4.52 | 54,047 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,217 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,425 |
| History of Russia Quiz | 0 | - | 4.49 | 31,784 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,624 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,740 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,694 |
| Ancient Greek Words | 0 | - | 4.92 | 110,633 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,191 |
| History of Italy | 0 | - | 4.55 | 31,807 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,476 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,974 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,497 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,375 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.92 | 79,472 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,812 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,662 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,447 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,307 |
| The George Washington Presidency | 0 | - | 4.03 | 14,473 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,865 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,204 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,607 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,374 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,412 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,425 |
| Europe Map Quiz | 0 | - | 5.00 | 4,729,792 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,735 |
| Save Europeans by Guessing Countries | 0 | - | 4.84 | 209,309 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,655 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,294 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,006 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,783 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,404 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,286 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.91 | 37,086 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,052 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 50,286 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,843 |
| Communist Countries in History | 0 | - | 4.63 | 492,351 |
| History of India | 0 | - | 4.61 | 21,274 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,151 |
| Africa Map Quiz | 0 | - | 5.00 | 2,103,696 |
| History of South Africa | 0 | - | 4.60 | 17,599 |
| Oceania Map Quiz | 0 | - | 4.98 | 634,994 |
| Australian Capitals | 0 | - | 4.92 | 62,589 |
| Biggest Cities in Australia on a Map | 0 | - | 4.61 | 37,531 |
| History of Mexico | 0 | - | 4.58 | 15,227 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,034 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,730 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,877 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,669 |
| U.S. President Scramble | 0 | - | 4.40 | 116,176 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,015 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,689 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,659 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,559 |
| Official European Union Languages | 0 | - | 4.97 | 236,459 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,659 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,052 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,519 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,212 |
| History of Austria | 0 | - | 4.70 | 17,742 |
| Geography of the French Empire | 0 | - | 4.48 | 26,923 |
| The French Revolution | 0 | - | 4.46 | 23,772 |
| History of France | 0 | - | 4.59 | 55,973 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,380 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 143,111 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,759 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,765 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,842 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,929 |
| Byzantine History | 0 | - | 4.91 | 28,604 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,423 |
| History of The Netherlands | 0 | - | 4.46 | 17,305 |
| The Vikings! | 0 | - | 4.45 | 28,239 |
| The Portuguese Empire | 0 | - | 4.54 | 11,986 |
| Arthurian Legend | 0 | - | 4.33 | 25,049 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,164 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,740 |
| Geography of the British Empire | 0 | - | 4.48 | 39,467 |
| Medieval English History | 0 | - | 4.53 | 43,306 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,439,317 |
| Asia Map Quiz | 0 | - | 4.99 | 906,627 |
| History of Iran | 0 | - | 4.65 | 16,262 |
| Ottoman Empire Quiz | 0 | - | 4.46 | 17,019 |
| Vietnam War Countries | 0 | - | 4.83 | 93,580 |
| Chinese Inventions | 0 | - | 4.30 | 33,717 |
| History of China | 0 | - | 4.37 | 56,674 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 92,834 |
| Historic Journeys on a World Map | 0 | - | 4.99 | 46,123 |
| Countries by Founding Story | 0 | - | 4.95 | 76,492 |
| Independence from Whom | 0 | - | 4.99 | 209,596 |
| Political Movements by Country | 0 | - | 4.46 | 72,248 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 130,681 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 61,973 |
| Countries of Africa | 0 | - | 5.00 | 2,506,444 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,421 |
| Flags of Africa Quiz | 0 | - | 5.00 | 462,921 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,778 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 215,569 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 115,532 |
| 10 Northernmost Countries in Africa | 0 | - | 4.98 | 160,212 |
| Top 10 Smallest African Countries by Area | 0 | - | 4.96 | 32,473 |
| African East Coast | 0 | - | 4.96 | 94,999 |
| African Countries with the Shortest Names | 0 | - | 4.98 | 152,028 |
| Western Africa Map Quiz | 0 | - | 4.97 | 72,893 |
| Top African Languages on a Map | 0 | - | 4.92 | 72,356 |
| African Island Countries | 0 | - | 4.96 | 100,738 |
| Countries of Africa with an Empty Map | 0 | - | 5.00 | 241,573 |
| All First-Level Subdivisions of Africa on a Map | 0 | - | 4.92 | 32,652 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 49,759 |
| Australian States and Territories | 0 | - | 4.95 | 140,608 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,001 |
| Australia Map Quiz | 0 | - | 4.94 | 342,376 |
| Australia True or False | 0 | - | 4.87 | 56,488 |
| Flags of North and South America | 0 | - | 4.99 | 366,667 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,131 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 143,133 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 128,103 |
| South America Map Quiz | 0 | - | 5.00 | 1,540,856 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,011,196 |
| North America Map Quiz | 0 | - | 4.98 | 244,272 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,367 |
| Arms Exports - United States | 0 | - | 4.70 | 54,319 |
| U.S. States by Governor | 0 | - | 4.43 | 17,979 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,568 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,150 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,545 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 54,922 |
| Win the U.S. Presidential Election | 0 | - | 4.80 | 618,087 |
