| Countries Invaded by the USSR | 0 | - | 4.29 | 93,495 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,618 |
| Name the English Monarchs | 0 | - | 4.92 | 497,529 |
| Monarchies of Europe | 0 | - | 4.90 | 97,239 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,820 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,325 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,274 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,017 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,492 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,184 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,053 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,131 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,316 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,151 |
| Communist Countries in History | 0 | - | 4.63 | 492,188 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,098 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,158 |
| Europe Map Quiz | 0 | - | 5.00 | 4,728,445 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,722 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,069 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,057 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,892 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,236 |
| Prime Ministers of the UK | 0 | - | 4.96 | 434,236 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,990 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,395 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,284 |
| Countries in World War I | 0 | - | 4.88 | 226,495 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,406 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,132 |
| Russia A-Z | 0 | - | 4.46 | 27,129 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,627 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,814 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,261 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,912 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,403 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,664 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,795 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,224,780 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,318,807 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,389 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,616 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,219 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,115 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,421 |
| The Only European Country ... | 0 | - | 4.91 | 213,574 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,370 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,210 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,183 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,092 |
| Slavic Countries | 0 | - | 4.96 | 110,791 |
| Counties of England | 0 | - | 4.97 | 788,543 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,362 |
| British History A-Z #1 | 0 | - | 4.45 | 45,771 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,540 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,219 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 94,977 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,255 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,712 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,140 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,704 |
| European Countries with One Border | 0 | - | 4.97 | 181,507 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,018 |
| Countries That Border Russia | 0 | - | 4.98 | 458,644 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,123 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,028 |
| Countries Bordering France | 0 | - | 4.85 | 397,595 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,587 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,909 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,796 |
| UK Cities Map Quiz | 0 | - | 4.95 | 461,973 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,860 |
| Counties of England Map Quiz | 0 | - | 4.97 | 305,984 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,157 |
| English Royal Consorts | 0 | - | 4.37 | 37,145 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,718 |
| Geography of the British Empire | 0 | - | 4.48 | 39,464 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,591 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,522 |
| Name the Popes Quiz | 0 | - | 4.47 | 136,990 |
| Countries of the Popes | 0 | - | 4.79 | 127,104 |
| Monarchies of Asia | 0 | - | 4.97 | 70,550 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,395 |
| Countries in World War II | 0 | - | 4.53 | 903,724 |
| Political Movements by Country | 0 | - | 4.46 | 72,235 |
| Battle to Country | 0 | - | 4.91 | 52,461 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,746 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,138 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,314 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,005 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,652 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,055 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,021 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,717 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,872 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,665 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,760 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,161 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,789 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,294 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 164,967 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,408 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,080 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,622 |
| Countries that Border Poland | 0 | - | 4.99 | 171,252 |
| Russia Country Quiz | 0 | - | 4.85 | 113,584 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,342 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,756 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,803 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,632 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,004 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,670 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,692 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,088 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,488 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,765 |
| Germany Country Quiz | 0 | - | 4.82 | 156,433 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,074 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,493 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,094 |
| Counties of Ireland | 0 | - | 4.92 | 192,861 |
| Italy Country Quiz | 0 | - | 4.82 | 122,108 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,273 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,001 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,392 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,919 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,198 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,889 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,547 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,696 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,004 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,170 |
| UK Immigration by Country | 0 | - | 4.94 | 139,517 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,011 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,180 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,473 |
| Medieval English History | 0 | - | 4.53 | 43,295 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,939 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,817 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,661 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,635 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,716 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,461 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,177 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,595 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,472 |
| National Founders | 0 | - | 4.40 | 83,626 |
| Important Cities in WWII | 0 | - | 4.42 | 92,836 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,239 |
| Hindu Countries | 0 | - | 4.85 | 49,466 |
| U.S. States by Governor | 0 | - | 4.43 | 17,976 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,563 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,535 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,785 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,874 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,389 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,934 |
| Presidential Middle Names | 0 | - | 4.41 | 59,647 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,684 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,763 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,148 |
| The American Civil War | 0 | - | 4.62 | 52,107 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,800 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,574 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,518 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,080 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,105 |
| Random European Flag to Country | 0 | - | 4.89 | 180,780 |
| Russia by Picture | 0 | - | 4.40 | 20,235 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,134 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,807 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,853 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,588 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,521 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,362 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,443 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,651 |
| Germany A-Z | 0 | - | 4.56 | 62,286 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,708 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,283 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,209 |
| The Trojan War | 0 | - | 4.83 | 39,400 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,381 |
| Name that Greek Letter | 0 | - | 4.94 | 321,476 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,404 |
| Italy A-Z | 0 | - | 4.49 | 57,643 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,820 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,996 |
| Roman Emperors | 0 | - | 4.95 | 118,343 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,773 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,295 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,612 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,483 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,411 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,781 |
| Monty Python Quotes | 0 | - | 4.88 | 42,307 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,231 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,685 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,597 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,068 |
