| Countries Invaded by the USSR | 0 | - | 4.30 | 94,521 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,971 |
| Name the English Monarchs | 0 | - | 4.91 | 507,512 |
| Monarchies of Europe | 0 | - | 4.90 | 99,060 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,594 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,139 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,047 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,051 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,179 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,097 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,994 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,018 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,689 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,078 |
| Communist Countries in History | 0 | - | 4.63 | 498,847 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,731,950 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,048 |
| Europe Map Quiz | 0 | - | 5.00 | 4,794,260 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,261 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,454 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,438 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,308 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,368 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,293 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,025 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,664 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,807 |
| Countries in World War I | 0 | - | 4.88 | 229,488 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,933 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,641 |
| Russia A-Z | 0 | - | 4.46 | 27,330 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,955 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,213 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 32,006 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,037 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,869 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,944 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,065 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,311 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,261,952 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,480 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,554 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,820 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,567 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,355 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,926 |
| The Only European Country ... | 0 | - | 4.91 | 219,683 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,876 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,792 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,404 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,938 |
| Slavic Countries | 0 | - | 4.96 | 112,534 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,522 |
| Counties of England | 0 | - | 4.97 | 804,505 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,150 |
| British History A-Z #1 | 0 | - | 4.45 | 47,349 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,658 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,006 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 97,020 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,769 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,922 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,926 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,658 |
| European Countries with One Border | 0 | - | 4.97 | 184,067 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,788 |
| Russia by Picture | 0 | - | 4.41 | 20,498 |
| Countries That Border Russia | 0 | - | 4.98 | 464,996 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,608 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,838 |
| Countries Bordering France | 0 | - | 4.83 | 405,424 |
| States of Germany Map Quiz | 0 | - | 4.92 | 134,004 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,670 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,303 |
| UK Cities Map Quiz | 0 | - | 4.96 | 466,900 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,668 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,329 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,492 |
| English Royal Consorts | 0 | - | 4.38 | 37,574 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,397 |
| Geography of the British Empire | 0 | - | 4.48 | 39,886 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,101 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,110 |
| Countries of the Popes | 0 | - | 4.78 | 128,921 |
| Monarchies of Asia | 0 | - | 4.97 | 71,629 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,369 |
| Countries in World War II | 0 | - | 4.55 | 920,533 |
| Political Movements by Country | 0 | - | 4.46 | 72,843 |
| Battle to Country | 0 | - | 4.91 | 54,142 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,248 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.92 | 95,737 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,975 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,204 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,167 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,879 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,409 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,959 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,838 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,425 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,340 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,491 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,155 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,710 |
| Countries that Border Poland | 0 | - | 4.99 | 173,372 |
| Russia Country Quiz | 0 | - | 4.83 | 115,479 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,363 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,208 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,849 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,120 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 35,657 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,235 |
| Andorra Country Quiz | 0 | - | 4.91 | 32,001 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,070 |
| France Cities Map Quiz | 0 | - | 4.96 | 168,022 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,240 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,579 |
| Germany Country Quiz | 0 | - | 4.82 | 159,102 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,273 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 99,209 |
| Counties of Ireland | 0 | - | 4.92 | 197,741 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,461 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,260 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,393 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,376 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,717 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,645 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 187,067 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,150 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,335 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,419 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 69,138 |
| UK Immigration by Country | 0 | - | 4.94 | 141,925 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 141,308 |
| Countries that Visit the UK the Most | 0 | - | 4.88 | 76,039 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,704 |
| Medieval English History | 0 | - | 4.53 | 43,694 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,360 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,109 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 36,034 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,441 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,433 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,825 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,804 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,594 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,965 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,734 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,161 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,515 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,629 |
| National Founders | 0 | - | 4.40 | 84,003 |
| Important Cities in WWII | 0 | - | 4.42 | 94,295 |
| U.S. States by Governor | 0 | - | 4.43 | 18,125 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,788 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,809 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,681 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,489 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,776 |
| Presidential Middle Names | 0 | - | 4.42 | 60,818 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,756 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,947 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,662 |
| The American Civil War | 0 | - | 4.62 | 52,667 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,071 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,722 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,291 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,834 |
| Random European Flag to Country | 0 | - | 4.90 | 184,514 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 84,241 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,770 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,918 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,097 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,073 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,022 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,227 |
| Germany A-Z | 0 | - | 4.56 | 62,910 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,147 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,530 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,582 |
| The Trojan War | 0 | - | 4.83 | 40,100 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,159 |
| Name that Greek Letter | 0 | - | 4.93 | 325,352 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,284 |
| Italy A-Z | 0 | - | 4.49 | 58,874 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,594 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,308 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,711 |
| Roman Emperors | 0 | - | 4.95 | 121,471 |
| Countries Closest to Iceland | 0 | - | 4.90 | 74,321 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,313 |
| Countries that Beat Portugal | 0 | - | 4.86 | 60,017 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,036 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,449 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,218 |
| Monty Python Quotes | 0 | - | 4.89 | 42,630 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,996 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,836 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,901 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,257 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,168 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,169 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,577 |
