| Countries Invaded by the USSR | 0 | - | 4.29 | 93,771 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,710 |
| Name the English Monarchs | 0 | - | 4.92 | 500,014 |
| Monarchies of Europe | 0 | - | 4.90 | 97,687 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,510 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,844 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,939 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,477 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,677 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,622 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,469 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,044 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,410 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,827 |
| Communist Countries in History | 0 | - | 4.63 | 493,854 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,673,261 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,753 |
| Europe Map Quiz | 0 | - | 5.00 | 4,745,266 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,845 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,765 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,404 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,452 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,492 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,545 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,268 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,858 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,235 |
| Countries in World War I | 0 | - | 4.88 | 227,389 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,938 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,179 |
| Russia A-Z | 0 | - | 4.46 | 27,185 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 107,933 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,331 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,682 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,460 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,149 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,339 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,669 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,884 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,234,277 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,300 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,278 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,126 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,682 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,365 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,749 |
| The Only European Country ... | 0 | - | 4.91 | 215,067 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,280 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,279 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,719 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,513 |
| Slavic Countries | 0 | - | 4.96 | 111,236 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,735 |
| Counties of England | 0 | - | 4.97 | 792,375 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,712 |
| British History A-Z #1 | 0 | - | 4.45 | 46,293 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,577 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,806 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,349 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,897 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,475 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,575 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,225 |
| European Countries with One Border | 0 | - | 4.97 | 182,093 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,962 |
| Countries That Border Russia | 0 | - | 4.98 | 460,279 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,519 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,747 |
| Countries Bordering France | 0 | - | 4.83 | 401,072 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,137 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,093 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,975 |
| UK Cities Map Quiz | 0 | - | 4.96 | 463,228 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,328 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,628 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,262 |
| English Royal Consorts | 0 | - | 4.37 | 37,266 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,081 |
| Geography of the British Empire | 0 | - | 4.48 | 39,580 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,644 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,563 |
| Countries of the Popes | 0 | - | 4.79 | 127,581 |
| Monarchies of Asia | 0 | - | 4.97 | 70,823 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,620 |
| Countries in World War II | 0 | - | 4.54 | 908,249 |
| Political Movements by Country | 0 | - | 4.46 | 72,383 |
| Battle to Country | 0 | - | 4.91 | 52,891 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,299 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,508 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,753 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,641 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,787 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 81,803 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,447 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,845 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,974 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,701 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,924 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,346 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,081 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,719 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,054 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,626 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,870 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,901 |
| Countries that Border Poland | 0 | - | 4.99 | 171,765 |
| Russia Country Quiz | 0 | - | 4.85 | 114,025 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,555 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,091 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,080 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,923 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,189 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,052 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,021 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,687 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,693 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,973 |
| Germany Country Quiz | 0 | - | 4.82 | 157,149 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,536 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,355 |
| Counties of Ireland | 0 | - | 4.92 | 193,986 |
| Italy Country Quiz | 0 | - | 4.82 | 122,653 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,803 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,439 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,632 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,137 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,873 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,385 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 185,020 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,407 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,081 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,201 |
| UK Immigration by Country | 0 | - | 4.94 | 140,150 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,922 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,634 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,453 |
| Medieval English History | 0 | - | 4.53 | 43,397 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,044 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,893 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,753 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,034 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,995 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,678 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 119,317 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,277 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,021 |
| National Founders | 0 | - | 4.40 | 83,733 |
| Important Cities in WWII | 0 | - | 4.42 | 93,187 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,625 |
| Hindu Countries | 0 | - | 4.86 | 49,812 |
| U.S. States by Governor | 0 | - | 4.43 | 18,015 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,620 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,604 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,249 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,914 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,319 |
| Presidential Middle Names | 0 | - | 4.41 | 59,920 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,973 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,194 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,276 |
| The American Civil War | 0 | - | 4.62 | 52,271 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,211 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,075 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,684 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,153 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,290 |
| Random European Flag to Country | 0 | - | 4.89 | 181,537 |
| Russia by Picture | 0 | - | 4.40 | 20,324 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,378 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,234 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,132 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,722 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,656 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,529 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,157 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,825 |
| Germany A-Z | 0 | - | 4.56 | 62,457 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,073 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,800 |
| Olympian Gods Quiz | 0 | - | 4.96 | 498,328 |
| The Trojan War | 0 | - | 4.83 | 39,558 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,497 |
| Name that Greek Letter | 0 | - | 4.93 | 322,498 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,140 |
| Italy A-Z | 0 | - | 4.49 | 57,997 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,376 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,119 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,270 |
| Roman Emperors | 0 | - | 4.95 | 119,220 |
| Countries Closest to Iceland | 0 | - | 4.89 | 73,136 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,528 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,943 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,632 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,651 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,117 |
| Monty Python Quotes | 0 | - | 4.88 | 42,371 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 492,177 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,725 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,668 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,110 |
