| Countries Invaded by the USSR | 0 | - | 4.29 | 94,273 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,896 |
| Name the English Monarchs | 0 | - | 4.91 | 504,996 |
| Monarchies of Europe | 0 | - | 4.90 | 98,550 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,997 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,416 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,396 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,536 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,013 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,540 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,474 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,132 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,588 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,325 |
| Communist Countries in History | 0 | - | 4.63 | 497,237 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,716,150 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,494 |
| Europe Map Quiz | 0 | - | 5.00 | 4,778,161 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,109 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,241 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,074 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,694 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,064 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,069 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,769 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,100 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,679 |
| Countries in World War I | 0 | - | 4.88 | 228,725 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,761 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,565 |
| Russia A-Z | 0 | - | 4.46 | 27,288 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,557 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,326 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,883 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,852 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,601 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,966 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,180 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,688 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,122 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,252,393 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,332,944 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 116,562 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,212 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,772 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,044 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,557 |
| The Only European Country ... | 0 | - | 4.91 | 218,096 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,046 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,981 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,848 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,583 |
| Slavic Countries | 0 | - | 4.96 | 112,115 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,304 |
| Counties of England | 0 | - | 4.97 | 800,673 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,022 |
| British History A-Z #1 | 0 | - | 4.45 | 46,652 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,641 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,524 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,258 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,142 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,068 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,551 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,209 |
| European Countries with One Border | 0 | - | 4.97 | 183,409 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,175 |
| Russia by Picture | 0 | - | 4.41 | 20,456 |
| Countries That Border Russia | 0 | - | 4.98 | 463,696 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,283 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,092 |
| Countries Bordering France | 0 | - | 4.83 | 404,153 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,449 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,474 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,184 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,721 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,318 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,556 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,431 |
| English Royal Consorts | 0 | - | 4.38 | 37,467 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,064 |
| Geography of the British Empire | 0 | - | 4.48 | 39,800 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,956 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,648 |
| Countries of the Popes | 0 | - | 4.79 | 128,506 |
| Monarchies of Asia | 0 | - | 4.97 | 71,351 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,139 |
| Countries in World War II | 0 | - | 4.54 | 916,510 |
| Political Movements by Country | 0 | - | 4.46 | 72,685 |
| Battle to Country | 0 | - | 4.91 | 53,707 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,110 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,809 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,564 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,086 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,127 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,846 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,265 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,694 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,601 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,886 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,222 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 263,280 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,466 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,413 |
| Countries that Border Poland | 0 | - | 4.99 | 172,852 |
| Russia Country Quiz | 0 | - | 4.83 | 115,041 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,098 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,169 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,585 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,856 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,483 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,849 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,855 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,787 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,440 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,046 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,361 |
| Germany Country Quiz | 0 | - | 4.83 | 158,497 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,844 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,905 |
| Counties of Ireland | 0 | - | 4.92 | 196,644 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,925 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,807 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,126 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,534 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,912 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,268 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,503 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,506 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,268 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,677 |
| UK Immigration by Country | 0 | - | 4.94 | 141,382 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,535 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,591 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,740 |
| Medieval English History | 0 | - | 4.53 | 43,612 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,254 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,034 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,922 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,917 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,134 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,600 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,328 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,649 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,361 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,272 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,607 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,987 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,841 |
| National Founders | 0 | - | 4.40 | 83,924 |
| Important Cities in WWII | 0 | - | 4.42 | 93,719 |
| U.S. States by Governor | 0 | - | 4.43 | 18,097 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,733 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,735 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,112 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,992 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,354 |
| Presidential Middle Names | 0 | - | 4.41 | 60,560 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,548 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,762 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,555 |
| The American Civil War | 0 | - | 4.62 | 52,560 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,592 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,221 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 62,107 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,295 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,668 |
| Random European Flag to Country | 0 | - | 4.90 | 183,606 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 83,741 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,308 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,654 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,971 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,943 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,339 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,073 |
| Germany A-Z | 0 | - | 4.56 | 62,770 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,803 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,001 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,693 |
| The Trojan War | 0 | - | 4.83 | 39,910 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,236 |
| Name that Greek Letter | 0 | - | 4.93 | 324,520 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,568 |
| Italy A-Z | 0 | - | 4.49 | 58,581 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,533 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,946 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,413 |
| Roman Emperors | 0 | - | 4.95 | 120,744 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,906 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,106 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,678 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,900 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,192 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,881 |
| Monty Python Quotes | 0 | - | 4.89 | 42,558 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,282 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,801 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,819 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,206 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,925 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,875 |
