| Countries Invaded by the USSR | 0 | - | 4.30 | 94,543 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,975 |
| Name the English Monarchs | 0 | - | 4.91 | 507,765 |
| Monarchies of Europe | 0 | - | 4.90 | 99,108 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,666 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,299 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,123 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,098 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,202 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,150 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 128,051 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,093 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,695 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,150 |
| Communist Countries in History | 0 | - | 4.63 | 499,008 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,652 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,107 |
| Europe Map Quiz | 0 | - | 5.00 | 4,795,760 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,273 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,504 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,457 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,348 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,506 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,491 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,056 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,702 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,878 |
| Countries in World War I | 0 | - | 4.88 | 229,539 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,030 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,746 |
| Russia A-Z | 0 | - | 4.46 | 27,338 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,989 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,266 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 32,015 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,053 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,896 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,041 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,152 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,418 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,262,823 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,874 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,639 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,866 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,605 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,495 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,967 |
| The Only European Country ... | 0 | - | 4.91 | 219,827 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,955 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,870 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,459 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,972 |
| Slavic Countries | 0 | - | 4.96 | 112,581 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,539 |
| Counties of England | 0 | - | 4.97 | 804,877 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,159 |
| British History A-Z #1 | 0 | - | 4.45 | 47,373 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,661 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,050 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 97,044 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,819 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,991 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,946 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,738 |
| European Countries with One Border | 0 | - | 4.97 | 184,131 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,843 |
| Russia by Picture | 0 | - | 4.41 | 20,501 |
| Countries That Border Russia | 0 | - | 4.98 | 465,140 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,637 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,889 |
| Countries Bordering France | 0 | - | 4.83 | 405,555 |
| States of Germany Map Quiz | 0 | - | 4.92 | 134,077 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,683 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,407 |
| UK Cities Map Quiz | 0 | - | 4.96 | 466,998 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,705 |
| Counties of England Map Quiz | 0 | - | 4.97 | 309,398 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,500 |
| English Royal Consorts | 0 | - | 4.38 | 37,575 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,423 |
| Geography of the British Empire | 0 | - | 4.48 | 39,895 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,115 |
| Name the Popes Quiz | 0 | - | 4.47 | 139,152 |
| Countries of the Popes | 0 | - | 4.78 | 128,957 |
| Monarchies of Asia | 0 | - | 4.97 | 71,654 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,397 |
| Countries in World War II | 0 | - | 4.55 | 920,869 |
| Political Movements by Country | 0 | - | 4.46 | 72,854 |
| Battle to Country | 0 | - | 4.91 | 54,177 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,274 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.92 | 95,817 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 93,021 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,224 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,179 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,884 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,424 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,967 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,859 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,554 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,428 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,700 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,220 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,738 |
| Countries that Border Poland | 0 | - | 4.99 | 173,419 |
| Russia Country Quiz | 0 | - | 4.83 | 115,534 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,387 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,209 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,882 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,138 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.85 | 35,681 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,267 |
| Andorra Country Quiz | 0 | - | 4.91 | 32,037 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,095 |
| France Cities Map Quiz | 0 | - | 4.96 | 168,209 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,256 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,612 |
| Germany Country Quiz | 0 | - | 4.82 | 159,188 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,327 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 99,341 |
| Counties of Ireland | 0 | - | 4.92 | 197,819 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,516 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,308 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,419 |
| Countries Italy Declared War On | 0 | - | 4.77 | 50,778 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,824 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,667 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 187,110 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,203 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,342 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,498 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 69,205 |
| UK Immigration by Country | 0 | - | 4.94 | 141,965 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 141,402 |
| Countries that Visit the UK the Most | 0 | - | 4.88 | 76,082 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,774 |
| Medieval English History | 0 | - | 4.53 | 43,700 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,369 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,116 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 36,039 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,468 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,468 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,845 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,948 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,663 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 98,019 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,772 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,193 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,555 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,680 |
| National Founders | 0 | - | 4.40 | 84,010 |
| Important Cities in WWII | 0 | - | 4.42 | 94,320 |
| U.S. States by Governor | 0 | - | 4.43 | 18,131 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,791 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,819 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,715 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,524 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,806 |
| Presidential Middle Names | 0 | - | 4.42 | 60,845 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,770 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,963 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,674 |
| The American Civil War | 0 | - | 4.62 | 52,685 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,121 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,777 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,311 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.74 | 58,849 |
| Random European Flag to Country | 0 | - | 4.90 | 184,589 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 84,271 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,823 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,940 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,105 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,088 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,077 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,252 |
| Germany A-Z | 0 | - | 4.56 | 62,930 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,174 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,580 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,783 |
| The Trojan War | 0 | - | 4.83 | 40,129 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,467 |
| Name that Greek Letter | 0 | - | 4.93 | 325,440 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,379 |
| Italy A-Z | 0 | - | 4.49 | 58,904 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,597 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,347 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,744 |
| Roman Emperors | 0 | - | 4.95 | 121,546 |
| Countries Closest to Iceland | 0 | - | 4.90 | 74,363 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,326 |
| Countries that Beat Portugal | 0 | - | 4.86 | 60,054 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,047 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,471 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,238 |
| Monty Python Quotes | 0 | - | 4.89 | 42,637 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 495,068 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,836 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,906 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,259 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,183 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,194 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,579 |
