| Countries Invaded by the USSR | 0 | - | 4.29 | 93,541 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,634 |
| Name the English Monarchs | 0 | - | 4.92 | 497,852 |
| Monarchies of Europe | 0 | - | 4.90 | 97,305 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,939 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,411 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,398 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,106 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,525 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,237 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,116 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,249 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,334 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,263 |
| Communist Countries in History | 0 | - | 4.63 | 492,486 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,653,949 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,245 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,011 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,743 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,143 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,105 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,965 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,443 |
| Prime Ministers of the UK | 0 | - | 4.96 | 434,613 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,037 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,477 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,394 |
| Countries in World War I | 0 | - | 4.88 | 226,597 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,700 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,295 |
| Russia A-Z | 0 | - | 4.46 | 27,140 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,672 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,906 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,290 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,945 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,532 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,831 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,964 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,226,472 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,319,696 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,539 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,708 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,282 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,297 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,462 |
| The Only European Country ... | 0 | - | 4.91 | 213,807 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,521 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,401 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,249 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,194 |
| Slavic Countries | 0 | - | 4.96 | 110,850 |
| Counties of England | 0 | - | 4.97 | 789,119 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,384 |
| British History A-Z #1 | 0 | - | 4.45 | 45,805 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,545 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,319 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,034 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,380 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,845 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,212 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,796 |
| European Countries with One Border | 0 | - | 4.97 | 181,613 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,515 |
| Countries That Border Russia | 0 | - | 4.98 | 458,892 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,190 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,112 |
| Countries Bordering France | 0 | - | 4.83 | 398,991 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,676 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,931 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,024 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,112 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,906 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,072 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,173 |
| English Royal Consorts | 0 | - | 4.37 | 37,159 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,767 |
| Geography of the British Empire | 0 | - | 4.48 | 39,470 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,608 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,539 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,145 |
| Countries of the Popes | 0 | - | 4.79 | 127,204 |
| Monarchies of Asia | 0 | - | 4.97 | 70,595 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,430 |
| Countries in World War II | 0 | - | 4.53 | 904,447 |
| Political Movements by Country | 0 | - | 4.46 | 72,258 |
| Battle to Country | 0 | - | 4.91 | 52,514 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,886 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,171 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,358 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,092 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,675 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,094 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,082 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,734 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,880 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,669 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,789 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,196 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,849 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,510 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,154 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,755 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,237 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,663 |
| Countries that Border Poland | 0 | - | 4.99 | 171,341 |
| Russia Country Quiz | 0 | - | 4.85 | 113,623 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,371 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,763 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,846 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,696 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,034 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,739 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,774 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,181 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,524 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,800 |
| Germany Country Quiz | 0 | - | 4.82 | 156,534 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,137 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,519 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,304 |
| Counties of Ireland | 0 | - | 4.92 | 193,050 |
| Italy Country Quiz | 0 | - | 4.82 | 122,192 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,364 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,073 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,447 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,944 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,311 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,949 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,630 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,839 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,021 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,297 |
| UK Immigration by Country | 0 | - | 4.94 | 139,620 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,129 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,254 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,593 |
| Medieval English History | 0 | - | 4.53 | 43,316 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,952 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,831 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,676 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,717 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,760 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,487 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,236 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,714 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,558 |
| National Founders | 0 | - | 4.40 | 83,647 |
| Important Cities in WWII | 0 | - | 4.42 | 92,878 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,335 |
| Hindu Countries | 0 | - | 4.85 | 49,568 |
| U.S. States by Governor | 0 | - | 4.43 | 17,983 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,572 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,545 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,929 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,946 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,486 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,999 |
| Presidential Middle Names | 0 | - | 4.41 | 59,699 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,731 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,814 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,169 |
| The American Civil War | 0 | - | 4.62 | 52,156 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,860 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,656 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,548 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,090 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,142 |
| Random European Flag to Country | 0 | - | 4.89 | 180,881 |
| Russia by Picture | 0 | - | 4.40 | 20,249 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,171 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,881 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,896 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,614 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,538 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,389 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,602 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,675 |
| Germany A-Z | 0 | - | 4.56 | 62,316 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,767 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,368 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,069 |
| The Trojan War | 0 | - | 4.83 | 39,425 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,831 |
| Name that Greek Letter | 0 | - | 4.94 | 321,641 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,528 |
| Italy A-Z | 0 | - | 4.49 | 57,711 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,869 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,042 |
| Roman Emperors | 0 | - | 4.95 | 118,479 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,844 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,342 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,670 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,505 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,460 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,833 |
| Monty Python Quotes | 0 | - | 4.88 | 42,323 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,392 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,686 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,607 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,073 |
