| Countries Invaded by the USSR | 0 | - | 4.29 | 93,595 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,664 |
| Name the English Monarchs | 0 | - | 4.92 | 498,478 |
| Monarchies of Europe | 0 | - | 4.90 | 97,408 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,064 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,518 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,558 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,205 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,561 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,328 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,189 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,414 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,356 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,460 |
| Communist Countries in History | 0 | - | 4.63 | 492,850 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,659,267 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,394 |
| Europe Map Quiz | 0 | - | 5.00 | 4,734,505 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,774 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,246 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,173 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,077 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,739 |
| Prime Ministers of the UK | 0 | - | 4.96 | 435,060 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,118 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,602 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,534 |
| Countries in World War I | 0 | - | 4.88 | 226,730 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,064 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,537 |
| Russia A-Z | 0 | - | 4.46 | 27,153 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,743 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,013 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,633 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,337 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,008 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,773 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,072 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,219 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,228,583 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,320,741 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,738 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,804 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,396 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,585 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,553 |
| The Only European Country ... | 0 | - | 4.91 | 214,129 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,749 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,693 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,369 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,286 |
| Slavic Countries | 0 | - | 4.96 | 110,942 |
| Counties of England | 0 | - | 4.97 | 789,968 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,575 |
| British History A-Z #1 | 0 | - | 4.45 | 46,125 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,557 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,455 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,100 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,510 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,018 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,302 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,907 |
| European Countries with One Border | 0 | - | 4.97 | 181,741 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,640 |
| Countries That Border Russia | 0 | - | 4.98 | 459,266 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,275 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,327 |
| Countries Bordering France | 0 | - | 4.83 | 399,970 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,835 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,975 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,287 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,408 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,106 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,244 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,214 |
| English Royal Consorts | 0 | - | 4.37 | 37,203 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,895 |
| Geography of the British Empire | 0 | - | 4.48 | 39,509 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,564 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,263 |
| Countries of the Popes | 0 | - | 4.79 | 127,311 |
| Monarchies of Asia | 0 | - | 4.97 | 70,650 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,470 |
| Countries in World War II | 0 | - | 4.54 | 905,468 |
| Political Movements by Country | 0 | - | 4.46 | 72,295 |
| Battle to Country | 0 | - | 4.91 | 52,597 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,013 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,220 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,429 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,182 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,716 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,150 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,156 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,767 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,893 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,673 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,822 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,237 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 137,904 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,782 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,357 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,175 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,374 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,725 |
| Countries that Border Poland | 0 | - | 4.99 | 171,459 |
| Russia Country Quiz | 0 | - | 4.85 | 113,727 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,428 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,767 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,914 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,762 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,080 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,826 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,847 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,337 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,576 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,848 |
| Germany Country Quiz | 0 | - | 4.82 | 156,710 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,268 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,584 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,561 |
| Counties of Ireland | 0 | - | 4.92 | 193,262 |
| Italy Country Quiz | 0 | - | 4.82 | 122,334 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,525 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,198 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,501 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,015 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,448 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,154 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,741 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,067 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,045 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,452 |
| UK Immigration by Country | 0 | - | 4.94 | 139,788 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,371 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,375 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,822 |
| Medieval English History | 0 | - | 4.53 | 43,334 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,977 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,852 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,700 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,813 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,838 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,530 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,319 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,823 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,657 |
| National Founders | 0 | - | 4.40 | 83,673 |
| Important Cities in WWII | 0 | - | 4.42 | 92,929 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,423 |
| Hindu Countries | 0 | - | 4.86 | 49,640 |
| U.S. States by Governor | 0 | - | 4.43 | 17,989 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,588 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,562 |
| U.S. Vice Presidents | 0 | - | 4.41 | 135,112 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,032 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,619 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,070 |
| Presidential Middle Names | 0 | - | 4.41 | 59,757 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,804 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,895 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,195 |
| The American Civil War | 0 | - | 4.62 | 52,183 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,973 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,779 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,592 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,103 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,189 |
| Random European Flag to Country | 0 | - | 4.89 | 181,054 |
| Russia by Picture | 0 | - | 4.40 | 20,277 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,226 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,982 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,951 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,657 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,569 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,440 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,828 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,746 |
| Germany A-Z | 0 | - | 4.56 | 62,349 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,850 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,483 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,870 |
| The Trojan War | 0 | - | 4.83 | 39,468 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 642,611 |
| Name that Greek Letter | 0 | - | 4.94 | 321,852 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,711 |
| Italy A-Z | 0 | - | 4.49 | 57,793 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,945 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,116 |
| Roman Emperors | 0 | - | 4.95 | 118,618 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,918 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,392 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,739 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,529 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,518 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,917 |
| Monty Python Quotes | 0 | - | 4.88 | 42,342 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,605 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,694 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,629 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,082 |
