| Countries Invaded by the USSR | 0 | - | 4.29 | 94,393 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,922 |
| Name the English Monarchs | 0 | - | 4.91 | 506,017 |
| Monarchies of Europe | 0 | - | 4.90 | 98,784 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,264 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,152 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,664 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,761 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,076 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,789 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,718 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,574 |
| Biggest Trading Partners - Russia | 0 | - | 4.55 | 36,628 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,647 |
| Communist Countries in History | 0 | - | 4.63 | 497,902 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,723,104 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,691 |
| Europe Map Quiz | 0 | - | 5.00 | 4,784,937 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,168 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,066 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,260 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,979 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 102,626 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,984 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,880 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,373 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,004 |
| Countries in World War I | 0 | - | 4.88 | 229,045 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,296 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,054 |
| Russia A-Z | 0 | - | 4.46 | 27,309 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,727 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,604 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,940 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,921 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,752 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,432 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,640 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,826 |
| Countries That Use the Euro | 0 | - | 4.95 | 106,597 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,256,376 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,334,950 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 116,973 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,415 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,965 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 220,553 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,716 |
| The Only European Country ... | 0 | - | 4.91 | 218,747 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,388 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,255 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,091 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,718 |
| Slavic Countries | 0 | - | 4.96 | 112,299 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,402 |
| Counties of England | 0 | - | 4.97 | 802,265 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,074 |
| British History A-Z #1 | 0 | - | 4.45 | 47,198 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,647 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,743 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,426 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,394 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,457 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,711 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,403 |
| European Countries with One Border | 0 | - | 4.97 | 183,683 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,435 |
| Russia by Picture | 0 | - | 4.41 | 20,474 |
| Countries That Border Russia | 0 | - | 4.98 | 464,307 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,419 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,539 |
| Countries Bordering France | 0 | - | 4.83 | 404,699 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,703 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,569 |
| Countries Bordering Germany | 0 | - | 4.99 | 371,649 |
| UK Cities Map Quiz | 0 | - | 4.96 | 466,261 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,471 |
| Counties of England Map Quiz | 0 | - | 4.97 | 308,922 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,446 |
| English Royal Consorts | 0 | - | 4.38 | 37,505 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,196 |
| Geography of the British Empire | 0 | - | 4.48 | 39,838 |
| All UK Parliament Constituencies on a Map | 0 | - | 4.60 | 29,004 |
| Name the Popes Quiz | 0 | - | 4.47 | 138,852 |
| Countries of the Popes | 0 | - | 4.79 | 128,673 |
| Monarchies of Asia | 0 | - | 4.97 | 71,464 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,246 |
| Countries in World War II | 0 | - | 4.53 | 918,196 |
| Political Movements by Country | 0 | - | 4.46 | 72,745 |
| Battle to Country | 0 | - | 4.91 | 53,899 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,178 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.94 | 94,504 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,782 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,131 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,138 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,859 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,321 |
| Most Guessed European Capitals | 0 | - | 4.87 | 101,792 |
| Top 10 European Countries by Coastline | 0 | - | 4.88 | 138,686 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 235,580 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,731 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 264,298 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,790 |
| European Capital Superlatives - Top 2 | 0 | - | 4.95 | 81,516 |
| Countries that Border Poland | 0 | - | 4.99 | 173,089 |
| Russia Country Quiz | 0 | - | 4.83 | 115,257 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,223 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,187 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,701 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,969 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,555 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,017 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,911 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,901 |
| France Cities Map Quiz | 0 | - | 4.95 | 167,705 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,121 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,444 |
| Germany Country Quiz | 0 | - | 4.82 | 158,747 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,009 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 98,446 |
| Counties of Ireland | 0 | - | 4.92 | 197,150 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,145 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,965 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,215 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,613 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,278 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,414 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,780 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,753 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,300 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,010 |
| UK Immigration by Country | 0 | - | 4.94 | 141,614 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 140,874 |
| Countries that Visit the UK the Most | 0 | - | 4.87 | 75,774 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 132,242 |
| Medieval English History | 0 | - | 4.53 | 43,638 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,296 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,071 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,972 |
| World Capitals Closest to London | 0 | - | 4.88 | 111,026 |
| 50 Busiest Air Routes from London | 0 | - | 4.87 | 97,254 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,707 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,043 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,140 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,622 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,445 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,930 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,261 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,325 |
| National Founders | 0 | - | 4.40 | 83,956 |
| Important Cities in WWII | 0 | - | 4.42 | 93,842 |
| U.S. States by Governor | 0 | - | 4.43 | 18,110 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,761 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,768 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,408 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,254 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,570 |
| Presidential Middle Names | 0 | - | 4.41 | 60,682 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,645 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,875 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,615 |
| The American Civil War | 0 | - | 4.62 | 52,615 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,789 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,406 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,179 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,322 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,730 |
| Random European Flag to Country | 0 | - | 4.90 | 184,064 |
| Flags of Countries That Border Russia | 0 | - | 4.70 | 83,996 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,523 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 96,772 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 28,025 |
| Moldova Country Quiz | 0 | - | 4.82 | 31,011 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,590 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,118 |
| Germany A-Z | 0 | - | 4.56 | 62,839 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,966 |
| Countries that Beat Germany | 0 | - | 4.94 | 107,238 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,463 |
| The Trojan War | 0 | - | 4.83 | 39,957 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 651,394 |
| Name that Greek Letter | 0 | - | 4.93 | 324,859 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,846 |
| Italy A-Z | 0 | - | 4.49 | 58,709 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,561 |
| Countries that Beat Italy | 0 | - | 4.85 | 55,119 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,549 |
| Roman Emperors | 0 | - | 4.95 | 121,090 |
| Countries Closest to Iceland | 0 | - | 4.90 | 74,085 |
| Countries that Beat Iceland | 0 | - | 4.81 | 43,196 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,821 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,964 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,306 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,022 |
| Monty Python Quotes | 0 | - | 4.89 | 42,597 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 494,596 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,819 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,856 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,236 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,047 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,008 |
