| Prime Ministers of the UK | 0 | - | 4.95 | 441,229 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,390 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,717,836 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,724 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,129 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,115 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,462 |
| Cities of China (With Some Help) | 0 | - | 4.91 | 31,720 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,794 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,386 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,687 |
| Countries of the Popes | 0 | - | 4.79 | 128,539 |
| China by Picture | 0 | - | 4.51 | 63,548 |
| All Cities in China with Population of 1 Million | 0 | - | 4.82 | 46,421 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,887 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,157 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,030 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,389 |
| Presidential Middle Names | 0 | - | 4.41 | 60,587 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,069 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,560 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,792 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,564 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,284 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,731 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,326 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,928 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,402 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,469 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,565 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,033 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,140 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,044 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,568 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,457 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,588 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,355 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,538 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,414 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 136,974 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,728 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,438 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,035 |
| Vietnam War Countries | 0 | - | 4.82 | 94,489 |
| China Cities Map Quiz | 0 | - | 4.94 | 105,695 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,311 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,929 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,576 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,749 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,326 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,712 |
| First Ladies of the United States | 0 | - | 4.28 | 85,843 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,276 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,372 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,308 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,059 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,547 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,679 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,485 |
| Name that Greek Letter | 0 | - | 4.93 | 324,609 |
| Name the English Monarchs | 0 | - | 4.91 | 505,217 |
| Every Asian Country Shape | 0 | - | 4.95 | 88,143 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,944 |
| Biggest Cities in China | 0 | - | 4.53 | 159,505 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,561 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,909 |
| National Founders | 0 | - | 4.40 | 83,930 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,851 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,024 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,609 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,901 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,832 |
| The Trojan War | 0 | - | 4.83 | 39,925 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,636 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 127,077 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,454 |
| Roman Emperors | 0 | - | 4.95 | 120,835 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,906 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,738 |
| Pope Facts | 0 | - | 4.39 | 31,342 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,098 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,359 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,063 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,219 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,754 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,907 |
| The George Washington Presidency | 0 | - | 4.03 | 14,586 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,764 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,718 |
| The John Adams Presidency | 0 | - | 4.12 | 8,770 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,967 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,759 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,355 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,737 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,422 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,893 |
| The American Revolution | 0 | - | 4.52 | 54,320 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,982 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 135,236 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,627 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,046 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,480 |
| History of Russia Quiz | 0 | - | 4.47 | 31,980 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,946 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,862 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,770 |
| Ancient Greek Words | 0 | - | 4.93 | 112,206 |
| History of Italy | 0 | - | 4.55 | 32,105 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,774 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,372 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,036 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,085 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,180 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 170,672 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,888 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,926 |
| Japan by Picture | 0 | - | 4.45 | 29,369 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,657 |
| History of South Africa | 0 | - | 4.60 | 17,739 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,129 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,849 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,521 |
| Europe Map Quiz | 0 | - | 5.00 | 4,779,610 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,124 |
| Least Forested Countries in Asia | 0 | - | 4.75 | 64,860 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 215,806 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,067 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,165 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,351 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,287 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,018 |
| History of Austria | 0 | - | 4.70 | 17,946 |
| Geography of the French Empire | 0 | - | 4.45 | 27,193 |
| The French Revolution | 0 | - | 4.47 | 24,108 |
| History of France | 0 | - | 4.61 | 57,447 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,537 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,911 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,296 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,496 |
| The Vikings! | 0 | - | 4.46 | 28,388 |
| The Portuguese Empire | 0 | - | 4.58 | 12,094 |
| Arthurian Legend | 0 | - | 4.33 | 25,144 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,434 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,093 |
| Geography of the British Empire | 0 | - | 4.48 | 39,810 |
| Asian Countries by First 2 Letters | 0 | - | 4.92 | 280,247 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 119,425 |
| History of Iran | 0 | - | 4.66 | 16,402 |
| History of China | 0 | - | 4.35 | 57,453 |
| History of India | 0 | - | 4.62 | 21,486 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 269,007 |
| Communist Countries in History | 0 | - | 4.63 | 497,378 |
| Political Movements by Country | 0 | - | 4.46 | 72,703 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,302 |
| Oceania Map Quiz | 0 | - | 4.98 | 657,684 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 51,205 |
| Australian Capitals | 0 | - | 4.92 | 62,801 |
| Australia Map Quiz | 0 | - | 4.95 | 345,705 |
| History of Mexico | 0 | - | 4.52 | 15,353 |
| United States Map Quiz | 0 | - | 4.98 | 4,167,303 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,089 |
| U.S. States by Governor | 0 | - | 4.43 | 18,104 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,737 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,748 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,604 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 632,539 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,580 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,252 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,877 |
| U.S. President Scramble | 0 | - | 4.40 | 117,330 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,298 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,749 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,023 |
| Events in U.S. History | 0 | - | 4.41 | 28,777 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,172 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,322 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 213,363 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,820 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,209 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,545 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,657 |
| Official European Union Languages | 0 | - | 4.97 | 239,384 |
| European Countries in their Native Language | 0 | - | 4.99 | 158,413 |
| Europe Geography Decoder | 0 | - | 4.86 | 70,209 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,662 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 430,075 |
| The Only European Country ... | 0 | - | 4.91 | 218,253 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,099 |
| French History Multiple Choice | 0 | - | 4.55 | 33,170 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,301 |
| History of Germany | 0 | - | 4.39 | 52,939 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,164 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,997 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,127 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,780 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,552 |
| Ancient Roman Trivia #2 | 0 | - | 4.60 | 43,993 |
| Geography of the Roman Empire | 0 | - | 4.56 | 52,145 |
| Roman Names for Places | 0 | - | 4.62 | 58,598 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,370 |
