| Name the English Monarchs | 0 | - | 4.92 | 497,480 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,144 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,263 |
| Countries in World War I | 0 | - | 4.88 | 226,397 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,843 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,916 |
| Monarchies of Europe | 0 | - | 4.90 | 97,228 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,805 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,313 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,266 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,008 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,927 |
| Federal Subjects of Russia | 0 | - | 4.94 | 143,649 |
| Countries That Border Russia | 0 | - | 4.98 | 458,615 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,488 |
| Battle to Country | 0 | - | 4.91 | 52,451 |
| Europe Map Quiz | 0 | - | 5.00 | 4,728,156 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,180 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,046 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,273 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 164,940 |
| Russia Country Quiz | 0 | - | 4.85 | 113,574 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,798 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,003 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,102 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,880 |
| Countries that Border Poland | 0 | - | 4.99 | 171,233 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,338 |
| Ukraine Country Quiz | 0 | - | 4.42 | 47,268 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,627 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,660 |
| Countries in World War II | 0 | - | 4.53 | 903,631 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,919 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,799 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,587 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,519 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,646 |
| The Trojan War | 0 | - | 4.83 | 39,400 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,314 |
| Name that Greek Letter | 0 | - | 4.94 | 321,461 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,382 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,987 |
| Roman Emperors | 0 | - | 4.95 | 118,326 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,772 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,105 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,368 |
| The Only European Country ... | 0 | - | 4.91 | 213,552 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,356 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,048 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,909 |
| The Vietnam War | 0 | - | 4.43 | 35,278 |
| The American Civil War | 0 | - | 4.62 | 52,103 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,224,571 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,318,734 |
| History of Russia Quiz | 0 | - | 4.49 | 31,774 |
| Ancient Greek Words | 0 | - | 4.92 | 110,565 |
| History of Italy | 0 | - | 4.55 | 31,800 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,466 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,963 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,623 |
| Counties of England | 0 | - | 4.97 | 788,482 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,360 |
| British History A-Z #1 | 0 | - | 4.45 | 45,765 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,260 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,282 |
| Important Cities in WWII | 0 | - | 4.42 | 92,831 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,608 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,210 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,083 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,414 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,720 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,596 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,588 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,174 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,082 |
| Slavic Countries | 0 | - | 4.96 | 110,783 |
| Most Mentioned Allies of Russia | 0 | - | 4.49 | 37,776 |
| Most Mentioned Enemies of Russia | 0 | - | 4.69 | 89,515 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,177 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,556 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,028 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,382 |
| Champions League Winners | 0 | - | 4.92 | 995,268 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,272 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 94,974 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,241 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,696 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,126 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,687 |
| European Countries with One Border | 0 | - | 4.97 | 181,489 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 177,997 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,131 |
| Albania Country Quiz | 0 | - | 4.54 | 38,610 |
| Czech Republic Country Quiz | 0 | - | 4.52 | 41,821 |
| Hungary Country Quiz | 0 | - | 4.49 | 42,985 |
| Romania Country Quiz | 0 | - | 4.63 | 53,307 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,113 |
| Serbia Country Quiz | 0 | - | 4.44 | 34,746 |
| History of Austria | 0 | - | 4.70 | 17,738 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,020 |
| Geography of the French Empire | 0 | - | 4.48 | 26,916 |
| The French Revolution | 0 | - | 4.46 | 23,752 |
| Countries Bordering France | 0 | - | 4.85 | 397,219 |
| Kings of France Quiz | 0 | - | 4.20 | 32,540 |
| History of France | 0 | - | 4.59 | 55,910 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,573 |
| States of Germany | 0 | - | 4.96 | 149,825 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,372 |
| Germany Immigration by Country | 0 | - | 4.84 | 79,926 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,904 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,760 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,713 |
| Regions of Italy | 0 | - | 4.92 | 74,609 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,746 |
| The Vikings! | 0 | - | 4.45 | 28,236 |
| The Portuguese Empire | 0 | - | 4.54 | 11,981 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,168 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,067 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,852 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,154 |
| English Royal Consorts | 0 | - | 4.37 | 37,142 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,714 |
| Geography of the British Empire | 0 | - | 4.48 | 39,464 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,589 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,539 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,393 |
| Monarchies of Asia | 0 | - | 4.97 | 70,545 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,387 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,733 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,134 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,308 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 90,995 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,052 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,018 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,299 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,488 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,649,640 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,173 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,980 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,757 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,785 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,061 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,122 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,753 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,055 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,010 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,375 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,061 |
| Russian History A-Z | 0 | - | 4.38 | 30,482 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,204 |
| Latvia Country Quiz | 0 | - | 4.75 | 31,736 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,495 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,676 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,083 |
| Departments of France | 0 | - | 4.93 | 52,689 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,477 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,760 |
| Germany Country Quiz | 0 | - | 4.82 | 156,421 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,072 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,079 |
| German History A-Z | 0 | - | 4.49 | 24,186 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,743 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,756 |
| Counties of Ireland | 0 | - | 4.92 | 192,841 |
| Italy Country Quiz | 0 | - | 4.82 | 122,093 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,266 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 150,997 |
| Italian History A-Z | 0 | - | 4.21 | 17,355 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,383 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,191 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,345 |
| Byzantine History | 0 | - | 4.91 | 28,587 |
| History of The Netherlands | 0 | - | 4.46 | 17,299 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,879 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,534 |
| Spanish History A-Z | 0 | - | 4.36 | 19,011 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,157 |
| British Acronyms | 0 | - | 4.39 | 45,603 |
| British Monopoly Board | 0 | - | 4.52 | 41,023 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,137 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,457 |
| Medieval English History | 0 | - | 4.53 | 43,295 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,660 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,624 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,713 |
| England or Wales? | 0 | - | 4.94 | 45,285 |
| All UEFA Champions League Teams Ever | 0 | - | 4.84 | 128,316 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,456 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,164 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,583 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,461 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,337 |
| Hindu Countries | 0 | - | 4.85 | 49,455 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,079 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,596 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 112,841 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,735 |
| Slovenia Country Quiz | 0 | - | 4.52 | 30,445 |
| Poland Country Quiz | 0 | - | 4.22 | 62,611 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,490 |
