| Countries Invaded by the USSR | 0 | - | 4.29 | 94,269 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,894 |
| Name the English Monarchs | 0 | - | 4.91 | 504,958 |
| Monarchies of Europe | 0 | - | 4.90 | 98,542 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,991 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,375 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,381 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,527 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,006 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,528 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,461 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,119 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,586 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,310 |
| Communist Countries in History | 0 | - | 4.63 | 497,201 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,715,745 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,468 |
| Europe Map Quiz | 0 | - | 5.00 | 4,777,731 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,108 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,231 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,069 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,682 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,032 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,028 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,762 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,010 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,662 |
| Countries in World War I | 0 | - | 4.88 | 228,708 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,732 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,525 |
| Russia A-Z | 0 | - | 4.46 | 27,286 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,546 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,317 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,882 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,848 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,597 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,929 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,145 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,681 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,101 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,252,187 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,332,815 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 116,539 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,200 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,763 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,007 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,547 |
| The Only European Country ... | 0 | - | 4.91 | 218,066 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,024 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,962 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,834 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,569 |
| Slavic Countries | 0 | - | 4.96 | 112,098 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,302 |
| Counties of England | 0 | - | 4.97 | 800,585 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,019 |
| British History A-Z #1 | 0 | - | 4.45 | 46,647 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,641 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,508 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,246 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,127 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,050 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,544 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,191 |
| European Countries with One Border | 0 | - | 4.97 | 183,396 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,163 |
| Russia by Picture | 0 | - | 4.41 | 20,454 |
| Countries That Border Russia | 0 | - | 4.98 | 463,665 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,275 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,085 |
| Countries Bordering France | 0 | - | 4.83 | 404,137 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,430 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,469 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,165 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,703 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,305 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,505 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,429 |
| English Royal Consorts | 0 | - | 4.38 | 37,464 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,053 |
| Geography of the British Empire | 0 | - | 4.48 | 39,800 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,953 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,639 |
| Countries of the Popes | 0 | - | 4.79 | 128,497 |
| Monarchies of Asia | 0 | - | 4.97 | 71,346 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,136 |
| Countries in World War II | 0 | - | 4.54 | 916,409 |
| Political Movements by Country | 0 | - | 4.46 | 72,681 |
| Battle to Country | 0 | - | 4.91 | 53,699 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,110 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,782 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,553 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,082 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,125 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,843 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,263 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,692 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,595 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,858 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,201 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 263,222 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,450 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,408 |
| Countries that Border Poland | 0 | - | 4.99 | 172,845 |
| Russia Country Quiz | 0 | - | 4.83 | 114,991 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,084 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,169 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,577 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,848 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,482 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,839 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,852 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,783 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,427 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,038 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,357 |
| Germany Country Quiz | 0 | - | 4.83 | 158,483 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,839 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,875 |
| Counties of Ireland | 0 | - | 4.92 | 196,614 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,919 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,794 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,122 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,526 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,815 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,268 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,490 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,488 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,267 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,656 |
| UK Immigration by Country | 0 | - | 4.94 | 141,370 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,510 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,574 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,727 |
| Medieval English History | 0 | - | 4.53 | 43,611 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,250 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,031 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,921 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,913 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,129 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,590 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,292 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,633 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,348 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,262 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,597 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,977 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,833 |
| National Founders | 0 | - | 4.40 | 83,922 |
| Important Cities in WWII | 0 | - | 4.42 | 93,712 |
| U.S. States by Governor | 0 | - | 4.43 | 18,094 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,731 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,730 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,099 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,984 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,337 |
| Presidential Middle Names | 0 | - | 4.41 | 60,556 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,545 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,760 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,553 |
| The American Civil War | 0 | - | 4.62 | 52,557 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,545 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,179 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 62,098 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,295 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,666 |
| Random European Flag to Country | 0 | - | 4.90 | 183,564 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 83,715 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,293 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,644 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,970 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,939 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,326 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,070 |
| Germany A-Z | 0 | - | 4.56 | 62,766 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,796 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,979 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,647 |
| The Trojan War | 0 | - | 4.83 | 39,903 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,181 |
| Name that Greek Letter | 0 | - | 4.93 | 324,501 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,553 |
| Italy A-Z | 0 | - | 4.49 | 58,571 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,533 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,926 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,393 |
| Roman Emperors | 0 | - | 4.95 | 120,729 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,891 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,100 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,674 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,897 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,191 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,875 |
| Monty Python Quotes | 0 | - | 4.89 | 42,556 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,265 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,800 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,819 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,204 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,922 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,869 |
