| Countries Invaded by the USSR | 0 | - | 4.29 | 93,962 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,779 |
| Name the English Monarchs | 0 | - | 4.91 | 501,962 |
| Monarchies of Europe | 0 | - | 4.90 | 98,027 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,020 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 79,871 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,448 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,822 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,835 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,019 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,879 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,186 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,489 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,388 |
| Communist Countries in History | 0 | - | 4.63 | 495,222 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,692,150 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,636 |
| Europe Map Quiz | 0 | - | 5.00 | 4,758,538 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,942 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,582 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,755 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,915 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 100,499 |
| Prime Ministers of the UK | 0 | - | 4.95 | 438,298 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,462 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,259 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,816 |
| Countries in World War I | 0 | - | 4.88 | 227,956 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,145 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,185 |
| Russia A-Z | 0 | - | 4.46 | 27,230 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,185 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,731 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,760 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,615 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,315 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,276 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,528 |
| Countries That Use the Euro | 0 | - | 4.95 | 104,732 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,241,757 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,327,124 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,001 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,535 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,070 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,390 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,054 |
| The Only European Country ... | 0 | - | 4.91 | 216,262 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,926 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,937 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,125 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,917 |
| Slavic Countries | 0 | - | 4.96 | 111,556 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,927 |
| Counties of England | 0 | - | 4.97 | 795,540 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,824 |
| British History A-Z #1 | 0 | - | 4.45 | 46,437 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,604 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,287 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,740 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,369 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,086 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,007 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,617 |
| European Countries with One Border | 0 | - | 4.97 | 182,616 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,432 |
| Countries That Border Russia | 0 | - | 4.98 | 461,373 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,799 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,262 |
| Countries Bordering France | 0 | - | 4.83 | 402,154 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,678 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,258 |
| Countries Bordering Germany | 0 | - | 4.99 | 368,837 |
| UK Cities Map Quiz | 0 | - | 4.96 | 464,204 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,916 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,158 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,318 |
| English Royal Consorts | 0 | - | 4.37 | 37,336 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,380 |
| Geography of the British Empire | 0 | - | 4.48 | 39,643 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,772 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,006 |
| Countries of the Popes | 0 | - | 4.79 | 127,985 |
| Monarchies of Asia | 0 | - | 4.97 | 71,027 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,811 |
| Countries in World War II | 0 | - | 4.54 | 911,594 |
| Political Movements by Country | 0 | - | 4.46 | 72,492 |
| Battle to Country | 0 | - | 4.91 | 53,231 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,711 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,199 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,477 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,212 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,899 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 83,706 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,051 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,950 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,067 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,776 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,076 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,475 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,322 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,889 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,881 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 260,429 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,502 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,100 |
| Countries that Border Poland | 0 | - | 4.99 | 172,150 |
| Russia Country Quiz | 0 | - | 4.85 | 114,364 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,777 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,129 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,284 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,143 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,317 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,320 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,647 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,235 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,579 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,819 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,125 |
| Germany Country Quiz | 0 | - | 4.82 | 157,703 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,989 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,360 |
| Counties of Ireland | 0 | - | 4.92 | 194,926 |
| Italy Country Quiz | 0 | - | 4.82 | 123,289 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,209 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,884 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,799 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,282 |
| Countries Closest to Italy | 0 | - | 4.97 | 197,872 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,795 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,495 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,841 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,139 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,799 |
| UK Immigration by Country | 0 | - | 4.94 | 140,773 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 139,605 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,996 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,415 |
| Medieval English History | 0 | - | 4.53 | 43,485 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,119 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,931 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,820 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,586 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,762 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,915 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.88 | 133,491 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 109,853 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,671 |
| National Founders | 0 | - | 4.40 | 83,811 |
| Important Cities in WWII | 0 | - | 4.42 | 93,407 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,935 |
| Hindu Countries | 0 | - | 4.86 | 50,068 |
| U.S. States by Governor | 0 | - | 4.43 | 18,054 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,680 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,658 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,598 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,347 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,682 |
| Presidential Middle Names | 0 | - | 4.41 | 60,165 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,243 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,514 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,387 |
| The American Civil War | 0 | - | 4.62 | 52,393 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,562 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,496 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,856 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,195 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,440 |
| Random European Flag to Country | 0 | - | 4.89 | 182,160 |
| Russia by Picture | 0 | - | 4.40 | 20,377 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,550 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,538 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,335 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,826 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,761 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,597 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,926 |
| Germany A-Z | 0 | - | 4.56 | 62,564 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,392 |
| Countries that Beat Germany | 0 | - | 4.95 | 106,211 |
| Olympian Gods Quiz | 0 | - | 4.96 | 500,230 |
| The Trojan War | 0 | - | 4.83 | 39,674 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,636 |
| Name that Greek Letter | 0 | - | 4.93 | 323,250 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,661 |
| Italy A-Z | 0 | - | 4.49 | 58,219 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,428 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,381 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,464 |
| Roman Emperors | 0 | - | 4.95 | 119,785 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,470 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,711 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,211 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,758 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,840 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,451 |
| Monty Python Quotes | 0 | - | 4.88 | 42,447 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 493,109 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,744 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,728 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,139 |
