| Countries Invaded by the USSR | 0 | - | 4.29 | 93,621 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,674 |
| Name the English Monarchs | 0 | - | 4.92 | 498,734 |
| Monarchies of Europe | 0 | - | 4.90 | 97,459 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,117 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,570 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,602 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,249 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,575 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,360 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,233 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,492 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,361 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,517 |
| Communist Countries in History | 0 | - | 4.63 | 493,011 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,661,240 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,426 |
| Europe Map Quiz | 0 | - | 5.00 | 4,736,130 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,787 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,276 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,199 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,122 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,871 |
| Prime Ministers of the UK | 0 | - | 4.96 | 435,287 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,156 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,636 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,610 |
| Countries in World War I | 0 | - | 4.88 | 226,777 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,168 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,641 |
| Russia A-Z | 0 | - | 4.46 | 27,156 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,769 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,075 |
| 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 | 52,040 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,861 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,145 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,328 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,229,352 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,321,143 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,819 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,847 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,437 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,694 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,581 |
| The Only European Country ... | 0 | - | 4.91 | 214,281 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,821 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,819 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,421 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,327 |
| Slavic Countries | 0 | - | 4.96 | 110,992 |
| Counties of England | 0 | - | 4.97 | 790,317 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,617 |
| British History A-Z #1 | 0 | - | 4.45 | 46,169 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,560 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,485 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,141 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,563 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,077 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,339 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,938 |
| European Countries with One Border | 0 | - | 4.97 | 181,786 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,684 |
| Countries That Border Russia | 0 | - | 4.98 | 459,534 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,307 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,387 |
| Countries Bordering France | 0 | - | 4.83 | 400,210 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,882 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,995 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,386 |
| UK Cities Map Quiz | 0 | - | 4.95 | 462,578 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,149 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,299 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,223 |
| English Royal Consorts | 0 | - | 4.37 | 37,218 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,926 |
| Geography of the British Empire | 0 | - | 4.48 | 39,524 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,579 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,304 |
| Countries of the Popes | 0 | - | 4.79 | 127,358 |
| Monarchies of Asia | 0 | - | 4.97 | 70,677 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,495 |
| Countries in World War II | 0 | - | 4.54 | 905,841 |
| Political Movements by Country | 0 | - | 4.46 | 72,313 |
| Battle to Country | 0 | - | 4.91 | 52,625 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,051 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,235 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,463 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,227 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,727 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,177 |
| 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 | 70,835 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,252 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 137,932 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,896 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,440 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 257,378 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,445 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,755 |
| Countries that Border Poland | 0 | - | 4.99 | 171,507 |
| Russia Country Quiz | 0 | - | 4.85 | 113,778 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,445 |
| Arms Exports - Russia | 0 | - | 4.48 | 24,768 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,943 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,778 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,096 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,862 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,866 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,387 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,594 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,873 |
| Germany Country Quiz | 0 | - | 4.82 | 156,776 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,314 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,612 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,701 |
| Counties of Ireland | 0 | - | 4.92 | 193,399 |
| Italy Country Quiz | 0 | - | 4.82 | 122,389 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,561 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,241 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,524 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,035 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,511 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,196 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,786 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,131 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,051 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,833 |
| UK Immigration by Country | 0 | - | 4.94 | 139,847 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,439 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,424 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,942 |
| Medieval English History | 0 | - | 4.53 | 43,347 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,985 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,858 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,707 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,861 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,858 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,553 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,359 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,883 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,709 |
| National Founders | 0 | - | 4.40 | 83,680 |
| Important Cities in WWII | 0 | - | 4.42 | 92,949 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,459 |
| Hindu Countries | 0 | - | 4.86 | 49,652 |
| 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 | 135,229 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,064 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,657 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,116 |
| Presidential Middle Names | 0 | - | 4.41 | 59,780 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,827 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,929 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,207 |
| The American Civil War | 0 | - | 4.62 | 52,191 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,012 |
| 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 | 12,111 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,199 |
| Random European Flag to Country | 0 | - | 4.89 | 181,142 |
| Russia by Picture | 0 | - | 4.40 | 20,283 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 70,248 |
| Countries that Beat Russia | 0 | - | 4.84 | 82,020 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,979 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,668 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,587 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,449 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,876 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,751 |
| Germany A-Z | 0 | - | 4.56 | 62,361 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 70,869 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,532 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,092 |
| The Trojan War | 0 | - | 4.83 | 39,477 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 642,886 |
| Name that Greek Letter | 0 | - | 4.94 | 321,952 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,757 |
| Italy A-Z | 0 | - | 4.49 | 57,824 |
| Countries that Beat Italy | 0 | - | 4.85 | 53,970 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,130 |
| Roman Emperors | 0 | - | 4.95 | 118,670 |
| Countries Closest to Iceland | 0 | - | 4.89 | 72,953 |
| Countries that Beat Iceland | 0 | - | 4.81 | 42,407 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,771 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,548 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,538 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,930 |
| Monty Python Quotes | 0 | - | 4.88 | 42,344 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,703 |
| 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 |
