| Countries Invaded by the USSR | 0 | - | 4.29 | 94,205 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,878 |
| Name the English Monarchs | 0 | - | 4.91 | 504,487 |
| Monarchies of Europe | 0 | - | 4.90 | 98,444 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,858 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,894 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,221 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,427 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,971 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,423 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,347 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,961 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,566 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,151 |
| Communist Countries in History | 0 | - | 4.63 | 496,863 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,769 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,356 |
| Europe Map Quiz | 0 | - | 5.00 | 4,774,384 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,078 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,119 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,004 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,522 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,763 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,605 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,721 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,731 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,524 |
| Countries in World War I | 0 | - | 4.88 | 228,591 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,309 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 365,300 |
| Russia A-Z | 0 | - | 4.46 | 27,272 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,474 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,217 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,865 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,816 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,544 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,518 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,781 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,544 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,834 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,250,337 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,331,722 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,917 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,049 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,553 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,673 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,456 |
| The Only European Country ... | 0 | - | 4.91 | 217,717 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,794 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,789 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,695 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,494 |
| Slavic Countries | 0 | - | 4.96 | 111,993 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,249 |
| Counties of England | 0 | - | 4.97 | 799,792 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,991 |
| British History A-Z #1 | 0 | - | 4.45 | 46,611 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,633 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,870 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,129 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,963 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,860 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,470 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,079 |
| European Countries with One Border | 0 | - | 4.97 | 183,248 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,024 |
| Russia by Picture | 0 | - | 4.41 | 20,442 |
| Countries That Border Russia | 0 | - | 4.98 | 463,089 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,191 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,967 |
| Countries Bordering France | 0 | - | 4.83 | 403,822 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,320 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,419 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,908 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,459 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,236 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,349 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,424 |
| English Royal Consorts | 0 | - | 4.38 | 37,440 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,971 |
| Geography of the British Empire | 0 | - | 4.48 | 39,770 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,932 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,544 |
| Countries of the Popes | 0 | - | 4.79 | 128,418 |
| Monarchies of Asia | 0 | - | 4.97 | 71,291 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,076 |
| Countries in World War II | 0 | - | 4.54 | 915,545 |
| Political Movements by Country | 0 | - | 4.46 | 72,653 |
| Battle to Country | 0 | - | 4.91 | 53,615 |
| Prime Ministers of Australia | 0 | - | 4.50 | 32,080 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,613 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,472 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,058 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,117 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,838 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,225 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,653 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,557 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,514 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,955 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,764 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,240 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,349 |
| Countries that Border Poland | 0 | - | 4.99 | 172,697 |
| Russia Country Quiz | 0 | - | 4.83 | 114,783 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,022 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,161 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,530 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,485 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,443 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,734 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,815 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,719 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,289 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,992 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,311 |
| Germany Country Quiz | 0 | - | 4.83 | 158,314 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,733 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,594 |
| Counties of Ireland | 0 | - | 4.92 | 196,298 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,799 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,700 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,060 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,462 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,463 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,176 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,343 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,375 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,247 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,499 |
| UK Immigration by Country | 0 | - | 4.94 | 141,245 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,339 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,476 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,480 |
| Medieval English History | 0 | - | 4.53 | 43,591 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,232 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,018 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,903 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,851 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,061 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,546 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,921 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,478 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,221 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,165 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,507 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,887 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,715 |
| National Founders | 0 | - | 4.40 | 83,898 |
| Important Cities in WWII | 0 | - | 4.42 | 93,655 |
| U.S. States by Governor | 0 | - | 4.43 | 18,084 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,722 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,720 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,006 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,816 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,211 |
| Presidential Middle Names | 0 | - | 4.41 | 60,469 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,488 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,699 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,513 |
| The American Civil War | 0 | - | 4.62 | 52,515 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,398 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,049 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 62,052 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,283 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,630 |
| Random European Flag to Country | 0 | - | 4.90 | 183,123 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 83,534 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,155 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,581 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,949 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,915 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,186 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,047 |
| Germany A-Z | 0 | - | 4.56 | 62,725 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,732 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,830 |
| Olympian Gods Quiz | 0 | - | 4.96 | 502,243 |
| The Trojan War | 0 | - | 4.83 | 39,845 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 649,602 |
| Name that Greek Letter | 0 | - | 4.93 | 324,329 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,399 |
| Italy A-Z | 0 | - | 4.49 | 58,501 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,513 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,704 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,986 |
| Roman Emperors | 0 | - | 4.95 | 120,534 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,801 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,026 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,586 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,874 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,129 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,806 |
| Monty Python Quotes | 0 | - | 4.89 | 42,520 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,116 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,793 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,811 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,194 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,880 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,809 |
