| Countries Invaded by the USSR | 0 | - | 4.29 | 93,875 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,744 |
| Name the English Monarchs | 0 | - | 4.91 | 500,967 |
| Monarchies of Europe | 0 | - | 4.90 | 97,850 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,747 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,025 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,166 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,626 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,764 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,772 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,670 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,392 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,452 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,098 |
| Communist Countries in History | 0 | - | 4.63 | 494,553 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,683,623 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,363 |
| Europe Map Quiz | 0 | - | 5.00 | 4,751,586 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,892 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,022 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,546 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,665 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,970 |
| Prime Ministers of the UK | 0 | - | 4.95 | 437,306 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,371 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,064 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,561 |
| Countries in World War I | 0 | - | 4.88 | 227,701 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,542 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,704 |
| Russia A-Z | 0 | - | 4.46 | 27,213 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,059 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,536 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,719 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,539 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,225 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,814 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,111 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,318 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,238,076 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,325,092 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,628 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,322 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,862 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,882 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,899 |
| The Only European Country ... | 0 | - | 4.91 | 215,691 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,591 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,624 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,887 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,627 |
| Slavic Countries | 0 | - | 4.96 | 111,398 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 31,843 |
| Counties of England | 0 | - | 4.97 | 793,937 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,773 |
| British History A-Z #1 | 0 | - | 4.45 | 46,359 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,589 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,050 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,593 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,145 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,759 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,784 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,393 |
| European Countries with One Border | 0 | - | 4.97 | 182,371 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,202 |
| Countries That Border Russia | 0 | - | 4.98 | 460,816 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,649 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,012 |
| Countries Bordering France | 0 | - | 4.83 | 401,621 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,411 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,186 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,405 |
| UK Cities Map Quiz | 0 | - | 4.96 | 463,782 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,479 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,907 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,294 |
| English Royal Consorts | 0 | - | 4.37 | 37,299 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,233 |
| Geography of the British Empire | 0 | - | 4.48 | 39,618 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,694 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,789 |
| Countries of the Popes | 0 | - | 4.79 | 127,767 |
| Monarchies of Asia | 0 | - | 4.97 | 70,915 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,732 |
| Countries in World War II | 0 | - | 4.54 | 909,960 |
| Political Movements by Country | 0 | - | 4.46 | 72,433 |
| Battle to Country | 0 | - | 4.91 | 53,063 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,512 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,673 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,933 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,978 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,826 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 82,840 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,618 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,905 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,041 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,739 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,004 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,411 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,229 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,298 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,462 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 259,531 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,180 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,999 |
| Countries that Border Poland | 0 | - | 4.99 | 171,961 |
| Russia Country Quiz | 0 | - | 4.85 | 114,176 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,666 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,110 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,183 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,034 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,260 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,184 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,128 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,287 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,760 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,051 |
| Germany Country Quiz | 0 | - | 4.82 | 157,433 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,786 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,843 |
| Counties of Ireland | 0 | - | 4.92 | 194,393 |
| Italy Country Quiz | 0 | - | 4.82 | 122,876 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,993 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,697 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,718 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,215 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,576 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,582 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,243 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,619 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,100 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,476 |
| UK Immigration by Country | 0 | - | 4.94 | 140,551 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 139,244 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,821 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,888 |
| Medieval English History | 0 | - | 4.53 | 43,437 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,080 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,917 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,791 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,167 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,628 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,768 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 120,670 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,550 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,238 |
| National Founders | 0 | - | 4.40 | 83,771 |
| Important Cities in WWII | 0 | - | 4.42 | 93,296 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,761 |
| Hindu Countries | 0 | - | 4.86 | 49,945 |
| U.S. States by Governor | 0 | - | 4.43 | 18,032 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,653 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,636 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,441 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,141 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,487 |
| Presidential Middle Names | 0 | - | 4.41 | 60,046 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,113 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,348 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,327 |
| The American Civil War | 0 | - | 4.62 | 52,341 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,376 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,271 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,773 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,177 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,358 |
| Random European Flag to Country | 0 | - | 4.89 | 181,803 |
| Russia by Picture | 0 | - | 4.40 | 20,350 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,457 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,388 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,219 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,767 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,710 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,588 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,388 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,874 |
| Germany A-Z | 0 | - | 4.56 | 62,517 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,215 |
| Countries that Beat Germany | 0 | - | 4.95 | 106,017 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,171 |
| The Trojan War | 0 | - | 4.83 | 39,622 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 645,575 |
| Name that Greek Letter | 0 | - | 4.93 | 322,910 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,403 |
| Italy A-Z | 0 | - | 4.49 | 58,108 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,401 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,255 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,365 |
| Roman Emperors | 0 | - | 4.95 | 119,551 |
| Countries Closest to Iceland | 0 | - | 4.89 | 73,303 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,622 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,065 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,672 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,738 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,290 |
| Monty Python Quotes | 0 | - | 4.88 | 42,415 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 492,590 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,733 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,702 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,123 |
