| Countries Invaded by the USSR | 0 | - | 4.29 | 93,475 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,614 |
| Name the English Monarchs | 0 | - | 4.92 | 497,357 |
| Monarchies of Europe | 0 | - | 4.90 | 97,206 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,762 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,291 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,232 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 69,987 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,478 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,164 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,025 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,086 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,313 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,102 |
| Communist Countries in History | 0 | - | 4.63 | 492,093 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,648,479 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,120 |
| Europe Map Quiz | 0 | - | 5.00 | 4,727,262 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,715 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,038 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,042 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,848 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,143 |
| Prime Ministers of the UK | 0 | - | 4.96 | 434,083 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,966 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,355 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,232 |
| Countries in World War I | 0 | - | 4.88 | 226,129 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,239 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,063 |
| Russia A-Z | 0 | - | 4.46 | 27,125 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,611 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,783 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,252 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,901 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,330 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,591 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,728 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,224,049 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,318,579 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,330 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,580 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,190 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,027 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,404 |
| The Only European Country ... | 0 | - | 4.91 | 213,483 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,312 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,163 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,136 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,056 |
| Slavic Countries | 0 | - | 4.96 | 110,769 |
| Counties of England | 0 | - | 4.97 | 788,307 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,355 |
| British History A-Z #1 | 0 | - | 4.45 | 45,738 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,538 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,157 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 94,955 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,210 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,640 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,108 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,643 |
| European Countries with One Border | 0 | - | 4.97 | 181,447 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 177,966 |
| Countries That Border Russia | 0 | - | 4.98 | 458,525 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,099 |
| Regions of France Map Quiz | 0 | - | 4.97 | 142,999 |
| Countries Bordering France | 0 | - | 4.85 | 396,211 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,561 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,891 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,678 |
| UK Cities Map Quiz | 0 | - | 4.95 | 461,873 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,837 |
| Counties of England Map Quiz | 0 | - | 4.97 | 305,948 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,154 |
| English Royal Consorts | 0 | - | 4.37 | 37,139 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,698 |
| Geography of the British Empire | 0 | - | 4.48 | 39,455 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,582 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,518 |
| Name the Popes Quiz | 0 | - | 4.47 | 136,949 |
| Countries of the Popes | 0 | - | 4.79 | 127,068 |
| Monarchies of Asia | 0 | - | 4.97 | 70,538 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,377 |
| Countries in World War II | 0 | - | 4.53 | 903,378 |
| Political Movements by Country | 0 | - | 4.46 | 72,225 |
| Battle to Country | 0 | - | 4.91 | 52,438 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,707 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,126 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,289 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 90,968 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,642 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,042 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 90,999 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,706 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,869 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,663 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,754 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,151 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,775 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,213 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 164,904 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,268 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,026 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,608 |
| Countries that Border Poland | 0 | - | 4.99 | 171,205 |
| Russia Country Quiz | 0 | - | 4.85 | 113,554 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,333 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,753 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,788 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,602 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 34,997 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,644 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,645 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,051 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,460 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,754 |
| Germany Country Quiz | 0 | - | 4.82 | 156,401 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,055 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,482 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,033 |
| Counties of Ireland | 0 | - | 4.92 | 192,798 |
| Italy Country Quiz | 0 | - | 4.82 | 122,072 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,251 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 150,980 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,360 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,907 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,162 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,868 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,505 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,668 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 36,998 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,125 |
| UK Immigration by Country | 0 | - | 4.94 | 139,488 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 137,969 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,152 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,423 |
| Medieval English History | 0 | - | 4.53 | 43,290 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,931 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,814 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,653 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,600 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,695 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,449 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,155 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,548 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,435 |
| National Founders | 0 | - | 4.40 | 83,618 |
| Important Cities in WWII | 0 | - | 4.42 | 92,811 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,210 |
| Hindu Countries | 0 | - | 4.85 | 49,444 |
| U.S. States by Governor | 0 | - | 4.43 | 17,971 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,555 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,526 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,727 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,839 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,344 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,904 |
| Presidential Middle Names | 0 | - | 4.41 | 59,633 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,658 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,736 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,144 |
| The American Civil War | 0 | - | 4.62 | 52,099 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,778 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,555 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,506 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,079 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,095 |
| Random European Flag to Country | 0 | - | 4.89 | 180,722 |
| Russia by Picture | 0 | - | 4.40 | 20,229 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,119 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,770 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,827 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,580 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,515 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,352 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,404 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,641 |
| Germany A-Z | 0 | - | 4.56 | 62,272 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,681 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,251 |
| Olympian Gods Quiz | 0 | - | 4.96 | 494,669 |
| The Trojan War | 0 | - | 4.83 | 39,393 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,152 |
| Name that Greek Letter | 0 | - | 4.94 | 321,435 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,337 |
| Italy A-Z | 0 | - | 4.49 | 57,624 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,802 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,975 |
| Roman Emperors | 0 | - | 4.95 | 118,283 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,745 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,275 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,589 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,477 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,400 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,747 |
| Monty Python Quotes | 0 | - | 4.88 | 42,300 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,167 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,683 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,593 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,065 |
