| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,784 |
| Countries in World War I | 0 | - | 4.88 | 229,474 |
| Name the English Monarchs | 0 | - | 4.91 | 507,457 |
| Countries in World War II | 0 | - | 4.54 | 920,438 |
| Important Cities in WWII | 0 | - | 4.42 | 94,287 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,029 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 653,070 |
| Name that Greek Letter | 0 | - | 4.93 | 325,331 |
| The Trojan War | 0 | - | 4.83 | 40,089 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,260 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,704 |
| Roman Emperors | 0 | - | 4.95 | 121,458 |
| The Dictator Files: Adolf Hitler | 0 | - | 4.78 | 78,404 |
| WWII First Names | 0 | - | 4.45 | 42,019 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,225 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,513 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,296 |
| Monarchies of Europe | 0 | - | 4.90 | 99,049 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,581 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,110 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,033 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,036 |
| World Leaders of the World Wars | 0 | - | 4.36 | 38,083 |
| Battle to Country | 0 | - | 4.91 | 54,130 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,085 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,973 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,384 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,305 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 32,006 |
| Houses of British Monarchs | 0 | - | 4.54 | 66,034 |
| Cities Bombed During WWII | 0 | - | 4.09 | 30,360 |
| Countries by Percent WWII Deaths | 0 | - | 4.05 | 30,263 |
| Europe Map Quiz | 0 | - | 5.00 | 4,793,887 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,831 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,293 |
| British History A-Z #1 | 0 | - | 4.45 | 47,345 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 431,436 |
| English Royal Consorts | 0 | - | 4.38 | 37,572 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 366,625 |
| German History A-Z | 0 | - | 4.49 | 24,951 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,532 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 74,493 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,894 |
| Ancient Roman Trivia #2 | 0 | - | 4.61 | 44,400 |
| Geography of the Roman Empire | 0 | - | 4.55 | 52,270 |
| Roman Names for Places | 0 | - | 4.62 | 58,795 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,359 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 38,106 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,657 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,861 |
| The Vietnam War | 0 | - | 4.44 | 35,694 |
| The American Civil War | 0 | - | 4.62 | 52,666 |
| Countries That Use the Euro | 0 | - | 4.95 | 107,281 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,261,715 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,360 |
| 10 Easternmost Countries in Europe | 0 | - | 4.87 | 117,524 |
| The Only European Country ... | 0 | - | 4.91 | 219,646 |
| European Countries NOT in NATO | 0 | - | 4.91 | 62,861 |
| History of Russia Quiz | 0 | - | 4.47 | 32,028 |
| Ancient Greek Words | 0 | - | 4.93 | 112,687 |
| History of Italy | 0 | - | 4.55 | 32,186 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,856 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,470 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,947 |
| Counties of England | 0 | - | 4.97 | 804,404 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,150 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 61,158 |
| British History Quiz for Dummies | 0 | - | 4.70 | 79,162 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 36,032 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 362,765 |
| WWII for Dummies | 0 | - | 4.78 | 105,890 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 193,799 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 152,557 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 221,316 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,917 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,253 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 313,222 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 176,576 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 90,392 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,928 |
| Slavic Countries | 0 | - | 4.96 | 112,524 |
| Countries Invaded by the USSR | 0 | - | 4.30 | 94,515 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,669 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,498 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,629 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,478 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,857 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,900 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,577 |
| Champions League Winners | 0 | - | 4.92 | 1,018,180 |
| Communist Countries in History | 0 | - | 4.63 | 498,813 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,964 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,173 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 99,105 |
| European Diaspora - Top 11 Countries | 0 | - | 4.88 | 97,008 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 138,750 |
| Three Band Flags of Europe | 0 | - | 4.98 | 194,894 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,920 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,004 |
| Pixelated Europe Map | 0 | - | 4.88 | 123,638 |
| European Countries with One Border | 0 | - | 4.97 | 184,049 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 180,769 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 279,362 |
| European Geography By Letter - B #2 | 0 | - | 4.87 | 89,100 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 265,448 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 116,143 |
| Russia Country Quiz | 0 | - | 4.83 | 115,466 |
| Federal Subjects of Russia | 0 | - | 4.95 | 149,964 |
| Countries That Border Russia | 0 | - | 4.98 | 464,961 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,843 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,594 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 35,651 |
| History of Austria | 0 | - | 4.70 | 17,992 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,994 |
| Regions of France Map Quiz | 0 | - | 4.97 | 145,828 |
| France Cities Map Quiz | 0 | - | 4.96 | 168,013 |
| Departments of France | 0 | - | 4.93 | 55,417 |
| Geography of the French Empire | 0 | - | 4.45 | 27,236 |
| The French Revolution | 0 | - | 4.47 | 24,169 |
| Countries Bordering France | 0 | - | 4.83 | 405,399 |
| Kings of France Quiz | 0 | - | 4.22 | 32,972 |
| History of France | 0 | - | 4.61 | 57,736 |
| French History A-Z | 0 | - | 4.27 | 25,198 |
| Germany Country Quiz | 0 | - | 4.82 | 159,084 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,991 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 127,250 |
| States of Germany | 0 | - | 4.95 | 154,964 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,578 |
| Germany Immigration by Country | 0 | - | 4.86 | 81,821 |
| Countries Bordering Germany | 0 | - | 4.99 | 372,280 |
| The Life of Alexander the Great | 0 | - | 4.51 | 18,596 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 21,051 |
| Figures from Greek Mythology | 0 | - | 4.91 | 192,874 |
| Regions of Italy | 0 | - | 4.92 | 77,276 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 150,451 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 153,246 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,785 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,197 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,278 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,927 |
| The Vikings! | 0 | - | 4.46 | 28,425 |
| The Portuguese Empire | 0 | - | 4.58 | 12,118 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,639 |
| Regions of Spain Quiz | 0 | - | 4.90 | 115,609 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 187,057 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,907 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,654 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,062 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,492 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,392 |
| Geography of the British Empire | 0 | - | 4.48 | 39,882 |
| British History A-Z #2 | 0 | - | 4.28 | 12,029 |
| The Reign of Queen Victoria | 0 | - | 4.34 | 23,572 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,884 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,874 |
| England or Wales? | 0 | - | 4.94 | 46,062 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 132,507 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,820 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,781 |
| Monarchies of Asia | 0 | - | 4.97 | 71,621 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,571 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,944 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,367 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,718 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,505 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,615 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.94 | 95,716 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,363 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,731,694 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,346 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,020 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,407 |
| Top 10 European Countries by Coastline | 0 | - | 4.86 | 138,831 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,441 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 66,068 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,432 |
| Countries that Border Poland | 0 | - | 4.99 | 173,358 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 83,361 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 103,335 |
| Countries that Border Hungary | 0 | - | 4.98 | 105,114 |
| Countries Bordering Serbia | 0 | - | 4.96 | 93,228 |
| French Geography Quiz #1 | 0 | - | 4.89 | 35,290 |
| Countries Bordering Austria | 0 | - | 4.97 | 119,058 |
| Countries that Visit France the Most | 0 | - | 4.85 | 46,233 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,570 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 99,177 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,285 |
| Geography of Ancient Greece | 0 | - | 4.69 | 32,076 |
| Counties of Ireland | 0 | - | 4.92 | 197,721 |
| Italian History A-Z | 0 | - | 4.16 | 17,959 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,378 |
| Countries Closest to Italy | 0 | - | 4.97 | 199,683 |
| Byzantine History | 0 | - | 4.91 | 29,055 |
| Byzantine Emperors | 0 | - | 4.93 | 14,665 |
| History of The Netherlands | 0 | - | 4.46 | 17,572 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,335 |
| Spanish History A-Z | 0 | - | 4.37 | 19,539 |
| Countries Closest to Spain | 0 | - | 4.96 | 228,398 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 69,119 |
| British Acronyms | 0 | - | 4.40 | 45,979 |
