| Prime Ministers of the UK | 0 | - | 4.95 | 438,105 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,690,346 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,191 |
| Vietnam War Countries | 0 | - | 4.82 | 94,112 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,870 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,302 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,167 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,127 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,307 |
| The American Revolution | 0 | - | 4.52 | 54,224 |
| Paramount Leaders of China | 0 | - | 4.36 | 11,058 |
| The Dictator Files: Chairman Mao | 0 | - | 4.28 | 20,662 |
| Country by Photo of its Leader | 0 | - | 4.72 | 123,905 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,043 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,449 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,873 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,418 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,962 |
| Countries of the Popes | 0 | - | 4.79 | 127,935 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,101 |
| Flags of Countries that Border China | 0 | - | 4.94 | 99,096 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,574 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,305 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,642 |
| Presidential Middle Names | 0 | - | 4.41 | 60,139 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,201 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,216 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,479 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,372 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,447 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,178 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,455 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,549 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,483 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,028 |
| Flags of WW1 | 0 | - | 4.60 | 38,306 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,240 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,950 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,962 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 77,884 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,356 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,763 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,666 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,907 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,356 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,430 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,661 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,170 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,498 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,820 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,505 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,099 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,244 |
| First Ladies of the United States | 0 | - | 4.28 | 85,558 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,931 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,205 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,973 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,171 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,941 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,579 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,805 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,410 |
| Name that Greek Letter | 0 | - | 4.93 | 323,180 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,305 |
| Name the English Monarchs | 0 | - | 4.91 | 501,768 |
| Pope Facts | 0 | - | 4.39 | 31,212 |
| Every Asian Country Shape | 0 | - | 4.95 | 87,599 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,081 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.88 | 132,987 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,585 |
| Prime Ministers of Israel | 0 | - | 3.97 | 17,926 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,469 |
| Arms Exports - United States | 0 | - | 4.75 | 62,302 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,420 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,773 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,357 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,832 |
| The Trojan War | 0 | - | 4.83 | 39,666 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,608 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 125,627 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,441 |
| Roman Emperors | 0 | - | 4.95 | 119,721 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,744 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,219 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,934 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,736 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,655 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,519 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,126 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,114 |
| National Founders | 0 | - | 4.40 | 83,800 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 48,841 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,368 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,067 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,767 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,607 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,692 |
| The George Washington Presidency | 0 | - | 4.03 | 14,538 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,717 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,624 |
| The John Adams Presidency | 0 | - | 4.12 | 8,737 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,922 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,730 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,310 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,661 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,894 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,838 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,436 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,915 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,790 |
| History of Russia Quiz | 0 | - | 4.49 | 31,887 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,126 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,461 |
| Countries of the German Empire | 0 | - | 4.51 | 37,882 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,760 |
| Ancient Greek Words | 0 | - | 4.93 | 111,412 |
| History of Italy | 0 | - | 4.55 | 31,945 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,631 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,181 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,807 |
| Tolkien's Middle Earth Map Quiz | 0 | - | 4.92 | 37,729 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,927 |
| Random Asian Countries on a Map | 0 | - | 4.91 | 169,803 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,788 |
| Communist Countries in History | 0 | - | 4.63 | 495,080 |
| History of India | 0 | - | 4.62 | 21,404 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,402 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 267,956 |
| History of South Africa | 0 | - | 4.60 | 17,664 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,934 |
| Win the U.S. Presidential Election | 0 | - | 4.78 | 625,820 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,479 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,175 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,644 |
| U.S. President Scramble | 0 | - | 4.40 | 116,676 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,155 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,851 |
| American Revolution Decoder | 0 | - | 4.10 | 20,944 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,198 |
| Europe Map Quiz | 0 | - | 5.00 | 4,757,208 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,993 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,934 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,660 |
| Save Europeans by Guessing Countries | 0 | - | 4.83 | 212,516 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,946 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,644 |
| History of Austria | 0 | - | 4.70 | 17,842 |
| Geography of the French Empire | 0 | - | 4.45 | 27,034 |
| The French Revolution | 0 | - | 4.46 | 23,913 |
| History of France | 0 | - | 4.59 | 56,878 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.40 | 23,464 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,951 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,885 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,549 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,271 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,050 |
| Byzantine History | 0 | - | 4.91 | 28,762 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,601 |
| The Vikings! | 0 | - | 4.46 | 28,324 |
| The Portuguese Empire | 0 | - | 4.58 | 12,053 |
| Arthurian Legend | 0 | - | 4.33 | 25,100 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,314 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,342 |
| Geography of the British Empire | 0 | - | 4.48 | 39,638 |
| Medieval English History | 0 | - | 4.53 | 43,476 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,600 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 278,783 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,389 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,561 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 118,892 |
| History of Iran | 0 | - | 4.66 | 16,343 |
| The Iraq War | 0 | - | 4.47 | 15,641 |
| History of China | 0 | - | 4.37 | 57,086 |
| Political Movements by Country | 0 | - | 4.46 | 72,475 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,558 |
| Countries of Africa | 0 | - | 5.00 | 2,531,606 |
| Africa Cities Map Quiz | 0 | - | 4.97 | 98,903 |
| Flags of Africa Quiz | 0 | - | 5.00 | 469,705 |
| Africa Map Quiz | 0 | - | 5.00 | 2,115,325 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 46,670 |
| Top 10 Biggest African Countries by Area | 0 | - | 4.99 | 216,736 |
| 10 Southernmost Countries in Africa | 0 | - | 4.98 | 116,439 |
| 10 Northernmost Countries in Africa | 0 | - | 4.98 | 161,062 |
| Top 10 Smallest African Countries by Area | 0 | - | 4.96 | 33,133 |
| African East Coast | 0 | - | 4.96 | 95,880 |
| African Countries with the Shortest Names | 0 | - | 4.98 | 153,257 |
| Western Africa Map Quiz | 0 | - | 4.97 | 73,686 |
| Top African Languages on a Map | 0 | - | 4.92 | 73,766 |
| African Island Countries | 0 | - | 4.96 | 101,477 |
| Countries of Africa with an Empty Map | 0 | - | 5.00 | 243,147 |
| All First-Level Subdivisions of Africa on a Map | 0 | - | 4.92 | 33,156 |
| Oceania Map Quiz | 0 | - | 4.98 | 640,984 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 50,513 |
| Australian States and Territories | 0 | - | 4.96 | 141,768 |
| Australian Capitals | 0 | - | 4.92 | 62,705 |
| Australian Immigration by Country | 0 | - | 4.81 | 77,245 |
| Australia Map Quiz | 0 | - | 4.95 | 343,926 |
| Australia True or False | 0 | - | 4.87 | 56,794 |
| Flags of North and South America | 0 | - | 4.99 | 372,218 |
| 10 Biggest American Countries by Area | 0 | - | 4.95 | 112,535 |
