| Countries Invaded by the USSR | 0 | - | 4.29 | 93,623 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,674 |
| Name the English Monarchs | 0 | - | 4.92 | 498,753 |
| Monarchies of Europe | 0 | - | 4.90 | 97,465 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,127 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,583 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,607 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,251 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,576 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,362 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,236 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,498 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,362 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,523 |
| Communist Countries in History | 0 | - | 4.63 | 493,023 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,661,390 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,430 |
| Europe Map Quiz | 0 | - | 5.00 | 4,736,269 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,787 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,278 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,202 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,126 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,880 |
| Prime Ministers of the UK | 0 | - | 4.96 | 435,303 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,158 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,638 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,615 |
| Countries in World War I | 0 | - | 4.88 | 226,779 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,173 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,648 |
| Russia A-Z | 0 | - | 4.46 | 27,157 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,770 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,079 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,636 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,367 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,043 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,870 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,150 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,336 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,229,417 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,321,190 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,827 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,850 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,440 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,704 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,582 |
| The Only European Country ... | 0 | - | 4.91 | 214,296 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,826 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,827 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,425 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,327 |
| Slavic Countries | 0 | - | 4.96 | 110,993 |
| Counties of England | 0 | - | 4.97 | 790,334 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,618 |
| British History A-Z #1 | 0 | - | 4.45 | 46,170 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,560 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,489 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,142 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,568 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,079 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,341 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,942 |
| European Countries with One Border | 0 | - | 4.97 | 181,792 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,690 |
| Countries That Border Russia | 0 | - | 4.98 | 459,541 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,309 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,394 |
| Countries Bordering France | 0 | - | 4.83 | 400,221 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,889 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,996 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,399 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,582 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,150 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,306 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,223 |
| English Royal Consorts | 0 | - | 4.37 | 37,219 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,928 |
| Geography of the British Empire | 0 | - | 4.48 | 39,525 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,580 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,311 |
| Countries of the Popes | 0 | - | 4.79 | 127,361 |
| Monarchies of Asia | 0 | - | 4.97 | 70,677 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,496 |
| Countries in World War II | 0 | - | 4.54 | 905,859 |
| Political Movements by Country | 0 | - | 4.46 | 72,314 |
| Battle to Country | 0 | - | 4.91 | 52,627 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,059 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,235 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,464 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,230 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,730 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,179 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,177 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,776 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,895 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,676 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,836 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,254 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 137,932 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,903 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,448 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,408 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,449 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,757 |
| Countries that Border Poland | 0 | - | 4.99 | 171,509 |
| Russia Country Quiz | 0 | - | 4.85 | 113,784 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,446 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,780 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,946 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,780 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,097 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,862 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,867 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,389 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,594 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,874 |
| Germany Country Quiz | 0 | - | 4.82 | 156,780 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,315 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,617 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,718 |
| Counties of Ireland | 0 | - | 4.92 | 193,406 |
| Italy Country Quiz | 0 | - | 4.82 | 122,393 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,565 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,244 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,526 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,035 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,516 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,199 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,787 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,132 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,051 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,840 |
| UK Immigration by Country | 0 | - | 4.94 | 139,851 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,442 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,426 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,948 |
| Medieval English History | 0 | - | 4.53 | 43,347 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,986 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,858 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,708 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,865 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,858 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,554 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,360 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,889 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,712 |
| National Founders | 0 | - | 4.40 | 83,681 |
| Important Cities in WWII | 0 | - | 4.42 | 92,949 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,462 |
| Hindu Countries | 0 | - | 4.86 | 49,655 |
| U.S. States by Governor | 0 | - | 4.43 | 17,994 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,591 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,564 |
| U.S. Vice Presidents | 0 | - | 4.41 | 135,233 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,065 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,657 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,117 |
| Presidential Middle Names | 0 | - | 4.41 | 59,780 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,828 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,932 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,208 |
| The American Civil War | 0 | - | 4.62 | 52,191 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,013 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,823 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,607 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,112 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,201 |
| Random European Flag to Country | 0 | - | 4.89 | 181,146 |
| Russia by Picture | 0 | - | 4.40 | 20,285 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,249 |
| Countries that Beat Russia | 0 | - | 4.84 | 82,024 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,980 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,668 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,587 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,451 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,879 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,751 |
| Germany A-Z | 0 | - | 4.56 | 62,363 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,873 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,541 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,109 |
| The Trojan War | 0 | - | 4.83 | 39,478 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 642,898 |
| Name that Greek Letter | 0 | - | 4.94 | 321,958 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,762 |
| Italy A-Z | 0 | - | 4.49 | 57,829 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,974 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,133 |
| Roman Emperors | 0 | - | 4.95 | 118,674 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,955 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,411 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,775 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,549 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,539 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,930 |
| Monty Python Quotes | 0 | - | 4.88 | 42,345 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,720 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,701 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,634 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,086 |
