| Countries Invaded by the USSR | 0 | - | 4.29 | 94,144 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,861 |
| Name the English Monarchs | 0 | - | 4.91 | 503,795 |
| Monarchies of Europe | 0 | - | 4.90 | 98,326 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,700 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,235 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,050 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,291 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,932 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,292 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,224 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,765 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,547 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,950 |
| Communist Countries in History | 0 | - | 4.63 | 496,428 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,707,155 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,046 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,919 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,045 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,977 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,936 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,334 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,427 |
| Prime Ministers of the UK | 0 | - | 4.95 | 439,941 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,627 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,620 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,327 |
| Countries in World War I | 0 | - | 4.88 | 228,431 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,987 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,976 |
| Russia A-Z | 0 | - | 4.46 | 27,264 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,404 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,084 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,839 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,756 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,466 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,261 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,540 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,448 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,506 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,248,030 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,490 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,636 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,893 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,408 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,305 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,339 |
| The Only European Country ... | 0 | - | 4.91 | 217,320 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,527 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,592 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,532 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,375 |
| Slavic Countries | 0 | - | 4.96 | 111,865 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,173 |
| Counties of England | 0 | - | 4.97 | 798,626 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,948 |
| British History A-Z #1 | 0 | - | 4.45 | 46,570 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,621 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,719 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,027 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,814 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,658 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,362 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,965 |
| European Countries with One Border | 0 | - | 4.97 | 183,092 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,869 |
| Russia by Picture | 0 | - | 4.41 | 20,430 |
| Countries That Border Russia | 0 | - | 4.98 | 462,743 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,076 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,768 |
| Countries Bordering France | 0 | - | 4.83 | 403,461 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,122 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,373 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,579 |
| UK Cities Map Quiz | 0 | - | 4.96 | 465,078 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,132 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,107 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,398 |
| English Royal Consorts | 0 | - | 4.38 | 37,405 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,644 |
| Geography of the British Empire | 0 | - | 4.48 | 39,733 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,885 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,412 |
| Countries of the Popes | 0 | - | 4.79 | 128,313 |
| Monarchies of Asia | 0 | - | 4.97 | 71,204 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,004 |
| Countries in World War II | 0 | - | 4.54 | 914,547 |
| Political Movements by Country | 0 | - | 4.46 | 72,613 |
| Battle to Country | 0 | - | 4.91 | 53,500 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,064 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,407 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,790 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,572 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,997 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,378 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,357 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,030 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,104 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,830 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,176 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,584 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,501 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,843 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,573 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,905 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,000 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,282 |
| Countries that Border Poland | 0 | - | 4.99 | 172,574 |
| Russia Country Quiz | 0 | - | 4.83 | 114,677 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,965 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,150 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,455 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,400 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,408 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,642 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,759 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,642 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,094 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,955 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,275 |
| Germany Country Quiz | 0 | - | 4.83 | 158,142 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,586 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,282 |
| Counties of Ireland | 0 | - | 4.92 | 195,943 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,628 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,282 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,012 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,404 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,309 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,093 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,164 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,235 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,215 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,321 |
| UK Immigration by Country | 0 | - | 4.94 | 141,134 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,128 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,347 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,214 |
| Medieval English History | 0 | - | 4.53 | 43,566 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,200 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,997 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,874 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,783 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,983 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,095 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,380 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,313 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,058 |
| National Founders | 0 | - | 4.40 | 83,873 |
| Important Cities in WWII | 0 | - | 4.42 | 93,592 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,189 |
| Hindu Countries | 0 | - | 4.86 | 50,289 |
| U.S. States by Governor | 0 | - | 4.43 | 18,078 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,714 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,705 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,911 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,694 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,973 |
| Presidential Middle Names | 0 | - | 4.41 | 60,393 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,441 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,660 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,477 |
| The American Civil War | 0 | - | 4.62 | 52,491 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,261 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,896 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,985 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,266 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,566 |
| Random European Flag to Country | 0 | - | 4.89 | 182,914 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 82,878 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,040 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,524 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,920 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,877 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,053 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,019 |
| Germany A-Z | 0 | - | 4.56 | 62,690 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,655 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,704 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,760 |
| The Trojan War | 0 | - | 4.83 | 39,793 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,705 |
| Name that Greek Letter | 0 | - | 4.93 | 324,121 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,203 |
| Italy A-Z | 0 | - | 4.49 | 58,421 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,488 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,630 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,640 |
| Roman Emperors | 0 | - | 4.95 | 120,365 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,724 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,975 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,495 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,840 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,052 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,712 |
| Monty Python Quotes | 0 | - | 4.89 | 42,500 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 493,737 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,776 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,793 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,182 |
