| Name the English Monarchs | 0 | - | 4.92 | 497,437 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,137 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,256 |
| Countries in World War I | 0 | - | 4.88 | 226,314 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,841 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,912 |
| Monarchies of Europe | 0 | - | 4.90 | 97,224 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,794 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,310 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,261 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,003 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,922 |
| Federal Subjects of Russia | 0 | - | 4.94 | 143,635 |
| Countries That Border Russia | 0 | - | 4.98 | 458,587 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,486 |
| Battle to Country | 0 | - | 4.91 | 52,448 |
| Europe Map Quiz | 0 | - | 5.00 | 4,727,922 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,180 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,040 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,262 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 164,928 |
| Russia Country Quiz | 0 | - | 4.85 | 113,570 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,798 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,002 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,101 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,870 |
| Countries that Border Poland | 0 | - | 4.99 | 171,231 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,337 |
| Ukraine Country Quiz | 0 | - | 4.42 | 47,267 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,618 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,656 |
| Countries in World War II | 0 | - | 4.53 | 903,564 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,905 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,793 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,587 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,519 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,644 |
| The Trojan War | 0 | - | 4.83 | 39,400 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,279 |
| Name that Greek Letter | 0 | - | 4.94 | 321,454 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,372 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 83,983 |
| Roman Emperors | 0 | - | 4.95 | 118,314 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,760 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,093 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,362 |
| The Only European Country ... | 0 | - | 4.91 | 213,533 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,345 |
| Olympian Gods Quiz | 0 | - | 4.96 | 494,966 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,906 |
| The Vietnam War | 0 | - | 4.43 | 35,278 |
| The American Civil War | 0 | - | 4.62 | 52,100 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,224,452 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,318,705 |
| History of Russia Quiz | 0 | - | 4.49 | 31,774 |
| Ancient Greek Words | 0 | - | 4.92 | 110,554 |
| History of Italy | 0 | - | 4.55 | 31,800 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,465 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,963 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,619 |
| Counties of England | 0 | - | 4.97 | 788,438 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,357 |
| British History A-Z #1 | 0 | - | 4.45 | 45,756 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,257 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,245 |
| Important Cities in WWII | 0 | - | 4.42 | 92,826 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,597 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,207 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,074 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,408 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,720 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,587 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,581 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,164 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,079 |
| Slavic Countries | 0 | - | 4.96 | 110,779 |
| Most Mentioned Allies of Russia | 0 | - | 4.49 | 37,773 |
| Most Mentioned Enemies of Russia | 0 | - | 4.69 | 89,514 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,154 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,554 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,026 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,380 |
| Champions League Winners | 0 | - | 4.92 | 995,217 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,270 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 94,970 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,235 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,678 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,119 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,677 |
| European Countries with One Border | 0 | - | 4.97 | 181,480 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 177,990 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,129 |
| Albania Country Quiz | 0 | - | 4.54 | 38,610 |
| Czech Republic Country Quiz | 0 | - | 4.52 | 41,817 |
| Hungary Country Quiz | 0 | - | 4.49 | 42,982 |
| Romania Country Quiz | 0 | - | 4.63 | 53,304 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,109 |
| Serbia Country Quiz | 0 | - | 4.44 | 34,742 |
| History of Austria | 0 | - | 4.70 | 17,738 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,015 |
| Geography of the French Empire | 0 | - | 4.48 | 26,915 |
| The French Revolution | 0 | - | 4.46 | 23,752 |
| Countries Bordering France | 0 | - | 4.85 | 397,007 |
| Kings of France Quiz | 0 | - | 4.20 | 32,539 |
| History of France | 0 | - | 4.59 | 55,899 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,569 |
| States of Germany | 0 | - | 4.96 | 149,815 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,372 |
| Germany Immigration by Country | 0 | - | 4.84 | 79,920 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,902 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,741 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,702 |
| Regions of Italy | 0 | - | 4.92 | 74,606 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,741 |
| The Vikings! | 0 | - | 4.45 | 28,236 |
| The Portuguese Empire | 0 | - | 4.54 | 11,980 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,152 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,064 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,848 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,154 |
| English Royal Consorts | 0 | - | 4.37 | 37,140 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,709 |
| Geography of the British Empire | 0 | - | 4.48 | 39,463 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,587 |
| 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 | 80,383 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,724 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,132 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,303 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 90,989 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,051 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,011 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,298 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,482 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,649,364 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,172 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,975 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,756 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,782 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,058 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,114 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,752 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,053 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,000 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,341 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,057 |
| Russian History A-Z | 0 | - | 4.38 | 30,422 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,184 |
| Latvia Country Quiz | 0 | - | 4.75 | 31,730 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,492 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,664 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,074 |
| Departments of France | 0 | - | 4.93 | 52,681 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,471 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,758 |
| Germany Country Quiz | 0 | - | 4.82 | 156,415 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,066 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,071 |
| German History A-Z | 0 | - | 4.49 | 24,182 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,741 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,753 |
| Counties of Ireland | 0 | - | 4.92 | 192,826 |
| Italy Country Quiz | 0 | - | 4.82 | 122,092 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,265 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 150,992 |
| Italian History A-Z | 0 | - | 4.21 | 17,352 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,376 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,184 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,343 |
| Byzantine History | 0 | - | 4.91 | 28,586 |
| History of The Netherlands | 0 | - | 4.46 | 17,299 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,878 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,530 |
| Spanish History A-Z | 0 | - | 4.36 | 19,008 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,148 |
| British Acronyms | 0 | - | 4.39 | 45,602 |
| British Monopoly Board | 0 | - | 4.52 | 41,022 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,121 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,449 |
| Medieval English History | 0 | - | 4.53 | 43,293 |
| The Reign of Queen Elizabeth II | 0 | - | 4.35 | 35,659 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,617 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,708 |
| England or Wales? | 0 | - | 4.94 | 45,283 |
| All UEFA Champions League Teams Ever | 0 | - | 4.84 | 128,305 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,456 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,161 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,574 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,455 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,336 |
| Hindu Countries | 0 | - | 4.85 | 49,451 |
| 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 | 112,834 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,733 |
| Slovenia Country Quiz | 0 | - | 4.52 | 30,444 |
| Poland Country Quiz | 0 | - | 4.22 | 62,602 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,488 |
