| Countries of the Soviet Union | 0 | - | 4.98 | 194,280 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,499 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,678,424 |
| Prime Ministers of the UK | 0 | - | 4.95 | 436,969 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,243 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,546 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,338 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,014 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,398 |
| Presidential Middle Names | 0 | - | 4.41 | 59,979 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,037 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,270 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,298 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,885 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,987 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,887 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,872 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,406 |
| Country by Photo of its Leader | 0 | - | 4.74 | 123,693 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,804 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,764 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,210 |
| First Ladies of the United States | 0 | - | 4.28 | 85,410 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,167 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,728 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,105 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,896 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,746 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,022 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,953 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,775 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,990 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,579 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 435,409 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,876 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,079 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,937 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,316 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,728 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,637 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,944 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,065 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,561 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,446 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 31,802 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 143,979 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,393 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,660 |
| Countries of the Popes | 0 | - | 4.79 | 127,666 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,411 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,237 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,720 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,478 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,564 |
| The George Washington Presidency | 0 | - | 4.03 | 14,512 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,693 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,577 |
| The John Adams Presidency | 0 | - | 4.12 | 8,711 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,908 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,715 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,273 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,642 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,813 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,122 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,320 |
| Every European Country Shape | 0 | - | 4.96 | 200,984 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 645,077 |
| Name that Greek Letter | 0 | - | 4.93 | 322,724 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,962 |
| Name the English Monarchs | 0 | - | 4.92 | 500,505 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,202 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,777 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,037 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,288 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,420 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,138 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,565 |
| U.S. President Scramble | 0 | - | 4.40 | 116,504 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,102 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,460 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,799 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,473 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,321 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,629 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,728 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,151 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,738 |
| The Trojan War | 0 | - | 4.83 | 39,592 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,276 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,208 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,325 |
| Roman Emperors | 0 | - | 4.95 | 119,411 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,655 |
| James Bond Countries Visited Map | 0 | - | 4.99 | 63,933 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,958 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,453 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,901 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,633 |
| National Founders | 0 | - | 4.40 | 83,752 |
| Flags of WW1 | 0 | - | 4.60 | 38,200 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,243 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,029 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,723 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 19,988 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,566 |
| Random U.S. Presidents by Picture | 0 | - | 4.39 | 66,015 |
| The Kennedy Family | 0 | - | 3.90 | 14,052 |
| The American Revolution | 0 | - | 4.52 | 54,167 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,824 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,477 |
| Random European Countries on a Map | 0 | - | 4.97 | 282,789 |
| Europe Map with Random Merged Countries | 0 | - | 4.97 | 316,973 |
| History of Russia Quiz | 0 | - | 4.49 | 31,858 |
| Countries of the German Empire | 0 | - | 4.51 | 37,807 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,466 |
| Ancient Greek Words | 0 | - | 4.93 | 111,176 |
| History of Italy | 0 | - | 4.55 | 31,911 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,585 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,114 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,745 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.91 | 37,390 |
| Top 100 UK Baby Girls' Names in 1850 | 0 | - | 4.35 | 61,839 |
| Countries Most-Visited By Queen Elizabeth II | 0 | - | 4.41 | 51,619 |
| People in Pictures with Queen Elizabeth II | 0 | - | 4.38 | 29,173 |
| Countries "Ruled" by King Charles III | 0 | - | 4.78 | 82,678 |
| Pope Facts | 0 | - | 4.39 | 31,146 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,730 |
| Communist Countries in History | 0 | - | 4.63 | 494,197 |
| History of India | 0 | - | 4.61 | 21,363 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,339 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,523 |
| History of South Africa | 0 | - | 4.60 | 17,644 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,872 |
| Win the U.S. Presidential Election | 0 | - | 4.80 | 623,247 |
| The Bill Clinton Presidency | 0 | - | 4.22 | 31,407 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,457 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,777 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,332 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,974 |
| Biggest European Cities by Letter | 0 | - | 4.54 | 126,454 |
| Europe Map Quiz | 0 | - | 5.00 | 4,748,640 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,046 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,871 |
| Random Sequential European Countries on a Map | 0 | - | 4.99 | 216,728 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 211,294 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,823 |
| History of Austria | 0 | - | 4.70 | 17,814 |
| Geography of the French Empire | 0 | - | 4.45 | 27,007 |
| The French Revolution | 0 | - | 4.46 | 23,876 |
| History of France | 0 | - | 4.59 | 56,673 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,441 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,883 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,851 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,995 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,174 |
| Byzantine History | 0 | - | 4.91 | 28,718 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,137 |
| The Vikings! | 0 | - | 4.46 | 28,299 |
| The Portuguese Empire | 0 | - | 4.58 | 12,034 |
| Arthurian Legend | 0 | - | 4.33 | 25,080 |
| Biggest British Empire Countries | 0 | - | 4.73 | 99,567 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,278 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,164 |
| Geography of the British Empire | 0 | - | 4.48 | 39,599 |
| Medieval English History | 0 | - | 4.53 | 43,422 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,322 |
| History of Iran | 0 | - | 4.66 | 16,318 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,893 |
| Vietnam War Countries | 0 | - | 4.83 | 93,940 |
| History of China | 0 | - | 4.37 | 56,949 |
| Political Movements by Country | 0 | - | 4.46 | 72,411 |
| Countries of Africa | 0 | - | 5.00 | 2,523,765 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,729 |
| Flags of Africa Quiz | 0 | - | 5.00 | 467,506 |
| Africa Map Quiz | 0 | - | 5.00 | 2,111,747 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,361 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 216,350 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 115,975 |
| 10 Northernmost Countries in Africa | 0 | - | 4.98 | 160,778 |
| Top 10 Smallest African Countries by Area | 0 | - | 4.96 | 32,897 |
| African East Coast | 0 | - | 4.96 | 95,606 |
| African Countries with the Shortest Names | 0 | - | 4.98 | 152,857 |
| Western Africa Map Quiz | 0 | - | 4.97 | 73,437 |
| Top African Languages on a Map | 0 | - | 4.92 | 73,327 |
| African Island Countries | 0 | - | 4.96 | 101,233 |
| Countries of Africa with an Empty Map | 0 | - | 5.00 | 242,746 |
| All First-Level Subdivisions of Africa on a Map | 0 | - | 4.92 | 33,024 |
| Oceania Map Quiz | 0 | - | 4.98 | 639,086 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,261 |
| Australian States and Territories | 0 | - | 4.96 | 141,449 |
| Australian Capitals | 0 | - | 4.92 | 62,670 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,168 |
| Australia Map Quiz | 0 | - | 4.94 | 343,433 |
| Australia True or False | 0 | - | 4.87 | 56,702 |
| Flags of North and South America | 0 | - | 4.99 | 370,713 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,437 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 143,585 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 129,001 |
| History of Mexico | 0 | - | 4.58 | 15,270 |
| South America Map Quiz | 0 | - | 5.00 | 1,545,472 |
