| Countries Invaded by the USSR | 0 | - | 4.29 | 94,063 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,831 |
| Name the English Monarchs | 0 | - | 4.91 | 503,138 |
| Monarchies of Europe | 0 | - | 4.90 | 98,202 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,498 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 82,435 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,796 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,108 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,900 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,192 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,091 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,532 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,528 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,732 |
| Communist Countries in History | 0 | - | 4.63 | 495,981 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,701,714 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,878 |
| Europe Map Quiz | 0 | - | 5.00 | 4,765,431 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,008 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,821 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,861 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,153 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,083 |
| Prime Ministers of the UK | 0 | - | 4.95 | 439,372 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,561 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,459 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,128 |
| Countries in World War I | 0 | - | 4.88 | 228,252 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,684 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,632 |
| Russia A-Z | 0 | - | 4.46 | 27,248 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,318 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,944 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,812 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,701 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,401 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,977 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,965 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,199 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,245,418 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,329,323 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,372 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,741 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,265 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 218,909 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,220 |
| The Only European Country ... | 0 | - | 4.91 | 216,874 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,281 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,354 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,373 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,267 |
| Slavic Countries | 0 | - | 4.96 | 111,729 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,081 |
| Counties of England | 0 | - | 4.97 | 797,563 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,898 |
| British History A-Z #1 | 0 | - | 4.45 | 46,520 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,613 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,548 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,919 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,640 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,446 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,195 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,829 |
| European Countries with One Border | 0 | - | 4.97 | 182,885 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,677 |
| Countries That Border Russia | 0 | - | 4.98 | 461,958 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,951 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,541 |
| Countries Bordering France | 0 | - | 4.83 | 402,739 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,913 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,321 |
| Countries Bordering Germany | 0 | - | 4.99 | 369,594 |
| UK Cities Map Quiz | 0 | - | 4.96 | 464,741 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,046 |
| Counties of England Map Quiz | 0 | - | 4.97 | 307,810 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,365 |
| English Royal Consorts | 0 | - | 4.38 | 37,382 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,551 |
| Geography of the British Empire | 0 | - | 4.48 | 39,702 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,843 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,275 |
| Countries of the Popes | 0 | - | 4.79 | 128,184 |
| Monarchies of Asia | 0 | - | 4.97 | 71,127 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,922 |
| Countries in World War II | 0 | - | 4.54 | 913,389 |
| Political Movements by Country | 0 | - | 4.46 | 72,557 |
| Battle to Country | 0 | - | 4.91 | 53,397 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,931 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,322 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,660 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,436 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,959 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,123 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,252 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,999 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,081 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,815 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,130 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,543 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,424 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,467 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,257 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,348 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,813 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,205 |
| Countries that Border Poland | 0 | - | 4.99 | 172,347 |
| Russia Country Quiz | 0 | - | 4.83 | 114,552 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,888 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,143 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,388 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,272 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,364 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,469 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,710 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,363 |
| France Cities Map Quiz | 0 | - | 4.96 | 166,859 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,896 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,210 |
| Germany Country Quiz | 0 | - | 4.83 | 157,957 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,422 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 96,926 |
| Counties of Ireland | 0 | - | 4.92 | 195,511 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,475 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,131 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,901 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,359 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,140 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,987 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,741 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,087 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,188 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,107 |
| UK Immigration by Country | 0 | - | 4.94 | 140,988 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 139,924 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,191 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 130,959 |
| Medieval English History | 0 | - | 4.53 | 43,535 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,173 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,979 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,853 |
| World Capitals Closest to London | 0 | - | 4.88 | 110,704 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 96,887 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,021 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 134,833 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,131 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,883 |
| National Founders | 0 | - | 4.40 | 83,851 |
| Important Cities in WWII | 0 | - | 4.42 | 93,522 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,087 |
| Hindu Countries | 0 | - | 4.86 | 50,205 |
| U.S. States by Governor | 0 | - | 4.43 | 18,066 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,704 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,688 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,788 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,561 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 93,859 |
| Presidential Middle Names | 0 | - | 4.41 | 60,317 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,384 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,624 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,450 |
| The American Civil War | 0 | - | 4.62 | 52,443 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,716 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,735 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,931 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,233 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,516 |
| Random European Flag to Country | 0 | - | 4.89 | 182,642 |
| Russia by Picture | 0 | - | 4.40 | 20,415 |
| Flags of Countries That Border Russia | 0 | - | 4.73 | 80,740 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,896 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,445 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,886 |
| Moldova Country Quiz | 0 | - | 4.82 | 30,835 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,863 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,972 |
| Germany A-Z | 0 | - | 4.56 | 62,636 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,526 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,533 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,170 |
| The Trojan War | 0 | - | 4.83 | 39,752 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 647,933 |
| Name that Greek Letter | 0 | - | 4.93 | 323,880 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,964 |
| Italy A-Z | 0 | - | 4.49 | 58,347 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,473 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,540 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,568 |
| Roman Emperors | 0 | - | 4.95 | 120,167 |
| Countries Closest to Iceland | 0 | - | 4.90 | 73,627 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,916 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,393 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,804 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,985 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,603 |
| Monty Python Quotes | 0 | - | 4.88 | 42,477 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 493,499 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,757 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,764 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,168 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,707 |
