| Countries Invaded by the USSR | 0 | - | 4.29 | 94,413 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,928 |
| Name the English Monarchs | 0 | - | 4.91 | 506,293 |
| Monarchies of Europe | 0 | - | 4.90 | 98,855 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,343 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,338 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,741 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,819 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,093 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,864 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,772 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,673 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,644 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,720 |
| Communist Countries in History | 0 | - | 4.63 | 498,135 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,725,184 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,761 |
| Europe Map Quiz | 0 | - | 5.00 | 4,787,444 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,180 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,181 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,294 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,058 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,805 |
| Prime Ministers of the UK | 0 | - | 4.95 | 442,228 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,921 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,437 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,105 |
| Countries in World War I | 0 | - | 4.88 | 229,119 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,468 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,195 |
| Russia A-Z | 0 | - | 4.46 | 27,314 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,803 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,984 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,960 |
| Houses of British Monarchs | 0 | - | 4.54 | 65,944 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,771 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,567 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,773 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,859 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,750 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,257,687 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,335,489 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,076 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,491 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,034 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,715 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,755 |
| The Only European Country ... | 0 | - | 4.91 | 218,947 |
| European Countries NOT in NATO | 0 | - | 4.90 | 62,480 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,360 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,161 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,773 |
| Slavic Countries | 0 | - | 4.96 | 112,354 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,436 |
| Counties of England | 0 | - | 4.97 | 802,733 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,092 |
| British History A-Z #1 | 0 | - | 4.45 | 47,254 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,650 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,812 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 96,499 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,468 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,551 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,750 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,459 |
| European Countries with One Border | 0 | - | 4.97 | 183,770 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,507 |
| Russia by Picture | 0 | - | 4.41 | 20,478 |
| Countries That Border Russia | 0 | - | 4.98 | 464,459 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,463 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,621 |
| Countries Bordering France | 0 | - | 4.83 | 404,852 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,780 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,609 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,802 |
| UK Cities Map Quiz | 0 | - | 4.96 | 466,397 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,515 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,000 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,460 |
| English Royal Consorts | 0 | - | 4.38 | 37,521 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,240 |
| Geography of the British Empire | 0 | - | 4.48 | 39,845 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,022 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,905 |
| Countries of the Popes | 0 | - | 4.79 | 128,725 |
| Monarchies of Asia | 0 | - | 4.97 | 71,495 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,281 |
| Countries in World War II | 0 | - | 4.53 | 918,724 |
| Political Movements by Country | 0 | - | 4.46 | 72,769 |
| Battle to Country | 0 | - | 4.91 | 53,942 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,194 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.94 | 95,049 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,825 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,143 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,144 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,861 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,347 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,813 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,718 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,800 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,876 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,567 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,862 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,553 |
| Countries that Border Poland | 0 | - | 4.99 | 173,152 |
| Russia Country Quiz | 0 | - | 4.83 | 115,297 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,247 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,193 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,731 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,999 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,578 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,077 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,931 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,937 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,775 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,143 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,463 |
| Germany Country Quiz | 0 | - | 4.82 | 158,815 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,056 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,589 |
| Counties of Ireland | 0 | - | 4.92 | 197,277 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,204 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,031 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,245 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,644 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,364 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,467 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,848 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,820 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,311 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,099 |
| UK Immigration by Country | 0 | - | 4.94 | 141,696 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,972 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,832 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,346 |
| Medieval English History | 0 | - | 4.53 | 43,654 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,316 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,087 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,985 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,053 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,289 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,732 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,234 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,337 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,694 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,506 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,986 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,320 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,402 |
| National Founders | 0 | - | 4.40 | 83,973 |
| Important Cities in WWII | 0 | - | 4.42 | 93,876 |
| U.S. States by Governor | 0 | - | 4.43 | 18,111 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,764 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,776 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,553 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,318 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,620 |
| Presidential Middle Names | 0 | - | 4.41 | 60,722 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,687 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,895 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,629 |
| The American Civil War | 0 | - | 4.62 | 52,623 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,837 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,472 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,194 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,334 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,744 |
| Random European Flag to Country | 0 | - | 4.90 | 184,188 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 84,048 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,585 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,804 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,038 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,023 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,682 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,138 |
| Germany A-Z | 0 | - | 4.56 | 62,858 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,006 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,293 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,676 |
| The Trojan War | 0 | - | 4.83 | 39,982 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,778 |
| Name that Greek Letter | 0 | - | 4.93 | 324,951 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,929 |
| Italy A-Z | 0 | - | 4.49 | 58,743 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,567 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,164 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,581 |
| Roman Emperors | 0 | - | 4.95 | 121,176 |
| Countries Closest to Iceland | 0 | - | 4.90 | 74,138 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,220 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,868 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,987 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,338 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,064 |
| Monty Python Quotes | 0 | - | 4.89 | 42,607 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,678 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,827 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,868 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,241 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,073 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,043 |
