| Countries of the Soviet Union | 0 | - | 4.98 | 195,144 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,908 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,411 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,567 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,283 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,491 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,991 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,794 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,155 |
| Presidential Middle Names | 0 | - | 4.41 | 60,466 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,481 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,692 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,504 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,752 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,531 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,987 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,073 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,574 |
| Country by Photo of its Leader | 0 | - | 4.70 | 124,323 |
| Prime Ministers of Australia | 0 | - | 4.50 | 32,059 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,578 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,294 |
| First Ladies of the United States | 0 | - | 4.28 | 85,776 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,253 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,295 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,250 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,012 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,865 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,863 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,600 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,849 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,964 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,287 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 438,330 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,313 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,403 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,824 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,578 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,260 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,848 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,865 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,213 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,420 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,219 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,247 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,083 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,512 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,528 |
| Countries of the Popes | 0 | - | 4.79 | 128,409 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,964 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,563 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,687 |
| The George Washington Presidency | 0 | - | 4.03 | 14,571 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,753 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,677 |
| The John Adams Presidency | 0 | - | 4.12 | 8,764 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,952 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,751 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,338 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,714 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,873 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,340 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,703 |
| Every European Country Shape | 0 | - | 4.96 | 202,338 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,551 |
| Name that Greek Letter | 0 | - | 4.93 | 324,316 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,361 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,130 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,575 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,134 |
| Name the English Monarchs | 0 | - | 4.91 | 504,438 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,502 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,580 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,104 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,154 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,813 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,745 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,548 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,218 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,779 |
| U.S. President Scramble | 0 | - | 4.40 | 117,162 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,239 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,665 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,965 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,485 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,625 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,617 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,878 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,729 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,204 |
| The Trojan War | 0 | - | 4.83 | 39,837 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,373 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 126,689 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,908 |
| Roman Emperors | 0 | - | 4.95 | 120,511 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,871 |
| James Bond Countries Visited Map | 0 | - | 4.99 | 64,463 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,805 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,916 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,321 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,715 |
| National Founders | 0 | - | 4.40 | 83,896 |
| Flags of WW1 | 0 | - | 4.60 | 38,530 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,114 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,835 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,125 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,620 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,376 |
| The Kennedy Family | 0 | - | 3.90 | 14,084 |
| The American Revolution | 0 | - | 4.52 | 54,296 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,587 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,748 |
| Random European Countries on a Map | 0 | - | 4.97 | 284,419 |
| Europe Map with Random Merged Countries | 0 | - | 4.97 | 319,563 |
| History of Russia Quiz | 0 | - | 4.47 | 31,968 |
| Countries of the German Empire | 0 | - | 4.51 | 38,052 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,730 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,721 |
| Ancient Greek Words | 0 | - | 4.93 | 112,025 |
| History of Italy | 0 | - | 4.55 | 32,081 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,744 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,318 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,987 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 38,011 |
| Top 100 UK Baby Girls' Names in 1850 | 0 | - | 4.35 | 62,327 |
| Countries Most-Visited By Queen Elizabeth II | 0 | - | 4.42 | 51,837 |
| People in Pictures with Queen Elizabeth II | 0 | - | 4.38 | 29,364 |
| Countries "Ruled" by King Charles III | 0 | - | 4.78 | 82,798 |
| Pope Facts | 0 | - | 4.39 | 31,313 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,874 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,582 |
| Communist Countries in History | 0 | - | 4.63 | 496,837 |
| History of South Africa | 0 | - | 4.60 | 17,727 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,052 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 630,838 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,488 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,518 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,852 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,434 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,439 |
| Biggest European Cities by Letter | 0 | - | 4.55 | 126,826 |
| Europe Map Quiz | 0 | - | 5.00 | 4,774,090 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,909 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,076 |
| Random Sequential European Countries on a Map | 0 | - | 4.99 | 217,612 |
| Save Europeans by Guessing Countries | 0 | - | 4.86 | 214,953 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,201 |
| History of Austria | 0 | - | 4.70 | 17,922 |
| Geography of the French Empire | 0 | - | 4.45 | 27,167 |
| The French Revolution | 0 | - | 4.47 | 24,076 |
| History of France | 0 | - | 4.61 | 57,340 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,110 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,968 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,864 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,930 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,458 |
| Byzantine History | 0 | - | 4.91 | 28,937 |
| Byzantine Emperors | 0 | - | 4.92 | 14,411 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,309 |
| The Vikings! | 0 | - | 4.46 | 28,374 |
| The Portuguese Empire | 0 | - | 4.58 | 12,087 |
| Arthurian Legend | 0 | - | 4.33 | 25,135 |
| Biggest British Empire Countries | 0 | - | 4.74 | 100,244 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,423 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,967 |
| Geography of the British Empire | 0 | - | 4.48 | 39,767 |
| Medieval English History | 0 | - | 4.53 | 43,589 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 279,853 |
| History of Iran | 0 | - | 4.66 | 16,390 |
| Prime Ministers of Israel | 0 | - | 3.97 | 18,009 |
| Vietnam War Countries | 0 | - | 4.82 | 94,400 |
| History of China | 0 | - | 4.37 | 57,372 |
| History of India | 0 | - | 4.62 | 21,467 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,543 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 268,738 |
| Political Movements by Country | 0 | - | 4.46 | 72,649 |
| Oceania Map Quiz | 0 | - | 4.98 | 655,513 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 51,028 |
| Australian States and Territories | 0 | - | 4.96 | 142,342 |
| Australian Capitals | 0 | - | 4.92 | 62,774 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,384 |
| Australia Map Quiz | 0 | - | 4.95 | 345,370 |
| Australia True or False | 0 | - | 4.87 | 56,988 |
| Flags of North and South America | 0 | - | 4.99 | 374,768 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,748 |
| Top 10 Most Populous American Countries | 0 | - | 4.97 | 144,456 |
| Latin American Countries Map Quiz | 0 | - | 4.97 | 130,205 |
| History of Mexico | 0 | - | 4.58 | 15,341 |
| South America Map Quiz | 0 | - | 5.00 | 1,552,354 |
| Uruguay Country Quiz | 0 | - | 4.84 | 31,654 |
| Central America and Caribbean Map Quiz | 0 | - | 4.89 | 903,152 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,026,749 |
| North America Map Quiz | 0 | - | 4.98 | 249,747 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,832 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,671 |
| Arms Exports - United States | 0 | - | 4.77 | 62,562 |
| U.S. States by Governor | 0 | - | 4.43 | 18,084 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,721 |
| Top 10 U.S. States by Republican Party Support | 0 | - | 4.44 | 75,646 |
| Top 10 U.S. States by Democratic Party Support | 0 | - | 4.63 | 81,478 |
