| Countries Invaded by the USSR | 0 | - | 4.29 | 93,756 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,706 |
| Name the English Monarchs | 0 | - | 4.92 | 499,869 |
| Monarchies of Europe | 0 | - | 4.90 | 97,660 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,477 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,807 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,908 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,447 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,323 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,665 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,672,202 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,572 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,445 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,834 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,987 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,402 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,778 |
| Communist Countries in History | 0 | - | 4.63 | 493,731 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,699 |
| Europe Map Quiz | 0 | - | 5.00 | 4,744,020 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,709 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,377 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,418 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 99,422 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,386 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,253 |
| Russia A-Z | 0 | - | 4.46 | 27,184 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,833 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,135 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,167 |
| Countries in World War I | 0 | - | 4.88 | 227,347 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,877 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,285 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,805 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 363,109 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 114,217 |
| The Only European Country ... | 0 | - | 4.91 | 214,968 |
| European Countries NOT in NATO | 0 | - | 4.90 | 60,219 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,077 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 107,917 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,297 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,676 |
| British History A-Z #1 | 0 | - | 4.45 | 46,281 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,453 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,617 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,912 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,233,685 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,085 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,088 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,663 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 217,263 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,731 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,219 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,677 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,496 |
| Slavic Countries | 0 | - | 4.96 | 111,193 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,081 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,724 |
| UK Cities Map Quiz | 0 | - | 4.95 | 463,113 |
| Counties of England | 0 | - | 4.97 | 792,115 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,698 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,576 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,268 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,723 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,532 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,775 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,411 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,765 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,840 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,304 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,855 |
| Three Band Flags of Europe | 0 | - | 4.98 | 192,426 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,551 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,195 |
| European Countries with One Border | 0 | - | 4.97 | 182,064 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,929 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,629 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,980 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,435 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,816 |
| European Capital Superlatives - Top 2 | 0 | - | 4.94 | 80,884 |
| Russia Country Quiz | 0 | - | 4.85 | 113,999 |
| Countries That Border Russia | 0 | - | 4.98 | 460,190 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,079 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,645 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,057 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,491 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,175 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,696 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,638 |
| Countries Bordering France | 0 | - | 4.83 | 400,971 |
| Germany Country Quiz | 0 | - | 4.82 | 157,112 |
| States of Germany Map Quiz | 0 | - | 4.91 | 132,100 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,500 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,890 |
| Italy Country Quiz | 0 | - | 4.82 | 122,620 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,771 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,403 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,124 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 96,363 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,989 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,380 |
| UK Immigration by Country | 0 | - | 4.94 | 140,052 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,839 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 93,299 |
| Counties of England Map Quiz | 0 | - | 4.97 | 306,576 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,257 |
| English Royal Consorts | 0 | - | 4.37 | 37,259 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,068 |
| Geography of the British Empire | 0 | - | 4.48 | 39,569 |
| Medieval English History | 0 | - | 4.53 | 43,385 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 28,629 |
| Name the Popes Quiz | 0 | - | 4.47 | 137,527 |
| Countries of the Popes | 0 | - | 4.79 | 127,555 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,667 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 118,976 |
| Monarchies of Asia | 0 | - | 4.97 | 70,805 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,232 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,993 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,603 |
| Countries in World War II | 0 | - | 4.54 | 907,990 |
| Political Movements by Country | 0 | - | 4.46 | 72,372 |
| Battle to Country | 0 | - | 4.91 | 52,869 |
| Hindu Countries | 0 | - | 4.86 | 49,799 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,486 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 81,559 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,959 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,695 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,111 |
| The American Civil War | 0 | - | 4.62 | 52,263 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,916 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,336 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,063 |
| Countries that Border Poland | 0 | - | 4.99 | 171,741 |
| Russia by Picture | 0 | - | 4.40 | 20,320 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,542 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,213 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,908 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,034 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,006 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,127 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,682 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,959 |
| Germany A-Z | 0 | - | 4.56 | 62,442 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,778 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 95,275 |
| The Trojan War | 0 | - | 4.83 | 39,547 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 644,286 |
| Name that Greek Letter | 0 | - | 4.93 | 322,441 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,101 |
| Counties of Ireland | 0 | - | 4.92 | 193,916 |
| Italy A-Z | 0 | - | 4.49 | 57,972 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,617 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,105 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,839 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,256 |
| Roman Emperors | 0 | - | 4.95 | 119,148 |
| Countries Closest to Iceland | 0 | - | 4.89 | 73,120 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,927 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,073 |
| Countries Closest to Spain | 0 | - | 4.96 | 226,166 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,635 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 74,612 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,091 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 129,378 |
| Monty Python Quotes | 0 | - | 4.88 | 42,369 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,664 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,465 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,031 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,891 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,320 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,458 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,747 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,826 |
| World Capitals Closest to London | 0 | - | 4.87 | 110,015 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 95,986 |
| 2025–2026 Football League Teams | 0 | - | 4.93 | 398,857 |
| National Founders | 0 | - | 4.40 | 83,727 |
| Important Cities in WWII | 0 | - | 4.42 | 93,162 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,600 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,002 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,114 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,756 |
| U.S. States by Governor | 0 | - | 4.43 | 18,012 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,615 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,253 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,599 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,231 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,889 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,299 |
| Presidential Middle Names | 0 | - | 4.41 | 59,906 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,958 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,173 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,843 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,267 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,809 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,186 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,044 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,679 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,147 |
