| Countries Invaded by the USSR | 0 | - | 4.30 | 94,545 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,975 |
| Name the English Monarchs | 0 | - | 4.91 | 507,776 |
| Monarchies of Europe | 0 | - | 4.90 | 99,109 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,669 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,306 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,129 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,103 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,204 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,152 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 128,055 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,098 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,696 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,156 |
| Communist Countries in History | 0 | - | 4.63 | 499,015 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,745 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,111 |
| Europe Map Quiz | 0 | - | 5.00 | 4,795,871 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,273 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,510 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,459 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,352 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,516 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,506 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,058 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,709 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,882 |
| Countries in World War I | 0 | - | 4.88 | 229,541 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,034 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,755 |
| Russia A-Z | 0 | - | 4.46 | 27,338 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,991 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,270 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 32,015 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,054 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,899 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,047 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,158 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,420 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,262,866 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,888 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,643 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,869 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,611 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,502 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,967 |
| The Only European Country ... | 0 | - | 4.91 | 219,839 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,961 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,874 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,464 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,973 |
| Slavic Countries | 0 | - | 4.96 | 112,584 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,541 |
| Counties of England | 0 | - | 4.97 | 804,898 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,159 |
| British History A-Z #1 | 0 | - | 4.45 | 47,374 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,661 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,052 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 97,045 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,820 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,995 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,948 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,739 |
| European Countries with One Border | 0 | - | 4.97 | 184,136 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,849 |
| Russia by Picture | 0 | - | 4.41 | 20,501 |
| Countries That Border Russia | 0 | - | 4.98 | 465,145 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,638 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,898 |
| Countries Bordering France | 0 | - | 4.83 | 405,558 |
| States of Germany Map Quiz | 0 | - | 4.92 | 134,078 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,683 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,411 |
| UK Cities Map Quiz | 0 | - | 4.96 | 467,002 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,707 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,399 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,501 |
| English Royal Consorts | 0 | - | 4.38 | 37,575 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,424 |
| Geography of the British Empire | 0 | - | 4.48 | 39,895 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,115 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,153 |
| Countries of the Popes | 0 | - | 4.78 | 128,961 |
| Monarchies of Asia | 0 | - | 4.97 | 71,655 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,398 |
| Countries in World War II | 0 | - | 4.55 | 920,896 |
| Political Movements by Country | 0 | - | 4.46 | 72,855 |
| Battle to Country | 0 | - | 4.91 | 54,177 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,274 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.92 | 95,828 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 93,022 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,224 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,180 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,885 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,424 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,967 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,866 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,561 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,431 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,713 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,225 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,739 |
| Countries that Border Poland | 0 | - | 4.99 | 173,421 |
| Russia Country Quiz | 0 | - | 4.83 | 115,537 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,389 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,209 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,882 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,138 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.85 | 35,683 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,267 |
| Andorra Country Quiz | 0 | - | 4.91 | 32,040 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,096 |
| France Cities Map Quiz | 0 | - | 4.96 | 168,230 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,256 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,614 |
| Germany Country Quiz | 0 | - | 4.82 | 159,194 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,327 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 99,348 |
| Counties of Ireland | 0 | - | 4.92 | 197,821 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,517 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,314 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,420 |
| Countries Italy Declared War On | 0 | - | 4.77 | 50,842 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,826 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,669 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 187,110 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,205 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,343 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,499 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 69,206 |
| UK Immigration by Country | 0 | - | 4.94 | 141,969 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 141,406 |
| Countries that Visit the UK the Most | 0 | - | 4.88 | 76,083 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,775 |
| Medieval English History | 0 | - | 4.53 | 43,701 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,370 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,117 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 36,041 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,469 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,470 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,845 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,955 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,666 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 98,023 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,775 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,198 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,556 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,684 |
| National Founders | 0 | - | 4.40 | 84,010 |
| Important Cities in WWII | 0 | - | 4.42 | 94,320 |
| U.S. States by Governor | 0 | - | 4.43 | 18,131 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,792 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,819 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,716 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,527 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,810 |
| Presidential Middle Names | 0 | - | 4.42 | 60,847 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,770 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,963 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,675 |
| The American Civil War | 0 | - | 4.62 | 52,686 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,124 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,785 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,311 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,849 |
| Random European Flag to Country | 0 | - | 4.90 | 184,592 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 84,273 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,826 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,941 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,105 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,089 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,082 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,253 |
| Germany A-Z | 0 | - | 4.56 | 62,930 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,176 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,582 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,794 |
| The Trojan War | 0 | - | 4.83 | 40,131 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,480 |
| Name that Greek Letter | 0 | - | 4.93 | 325,446 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,385 |
| Italy A-Z | 0 | - | 4.49 | 58,907 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,597 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,352 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,746 |
| Roman Emperors | 0 | - | 4.95 | 121,550 |
| Countries Closest to Iceland | 0 | - | 4.90 | 74,363 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,328 |
| Countries that Beat Portugal | 0 | - | 4.86 | 60,056 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,047 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,473 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,240 |
| Monty Python Quotes | 0 | - | 4.89 | 42,637 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 495,073 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,836 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,906 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,259 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,183 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,195 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,579 |
