| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,313 |
| Countries in World War I | 0 | - | 4.88 | 228,415 |
| Name the English Monarchs | 0 | - | 4.91 | 503,736 |
| Countries in World War II | 0 | - | 4.54 | 914,455 |
| Important Cities in WWII | 0 | - | 4.42 | 93,586 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,029 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,642 |
| Name that Greek Letter | 0 | - | 4.93 | 324,108 |
| The Trojan War | 0 | - | 4.83 | 39,787 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,170 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,636 |
| Roman Emperors | 0 | - | 4.95 | 120,334 |
| The Dictator Files: Adolf Hitler | 0 | - | 4.79 | 78,042 |
| WWII First Names | 0 | - | 4.44 | 41,833 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,017 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,166 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,402 |
| Monarchies of Europe | 0 | - | 4.90 | 98,320 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,684 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,169 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,035 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,279 |
| World Leaders of the World Wars | 0 | - | 4.36 | 37,893 |
| Battle to Country | 0 | - | 4.91 | 53,494 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,275 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,206 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 233,816 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,545 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,838 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,748 |
| Cities Bombed During WWII | 0 | - | 4.09 | 30,198 |
| Countries by Percent WWII Deaths | 0 | - | 4.07 | 30,069 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,611 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,563 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,326 |
| British History A-Z #1 | 0 | - | 4.45 | 46,569 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 428,886 |
| English Royal Consorts | 0 | - | 4.38 | 37,401 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 364,951 |
| German History A-Z | 0 | - | 4.49 | 24,649 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,718 |
| Greek Mythology General Knowledge #2 | 0 | - | 4.59 | 73,851 |
| Ancient Greece - Multiple Choice | 0 | - | 4.54 | 41,701 |
| Ancient Roman Trivia #2 | 0 | - | 4.57 | 38,783 |
| Geography of the Roman Empire | 0 | - | 4.56 | 51,986 |
| Roman Names for Places | 0 | - | 4.62 | 58,388 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 55,200 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,995 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,621 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 52,461 |
| The Vietnam War | 0 | - | 4.44 | 35,570 |
| The American Civil War | 0 | - | 4.62 | 52,485 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,483 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,247,816 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,439 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 115,620 |
| The Only European Country ... | 0 | - | 4.91 | 217,289 |
| European Countries NOT in NATO | 0 | - | 4.90 | 61,511 |
| History of Russia Quiz | 0 | - | 4.47 | 31,945 |
| Ancient Greek Words | 0 | - | 4.93 | 111,859 |
| History of Italy | 0 | - | 4.55 | 32,044 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,714 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,291 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,396 |
| Counties of England | 0 | - | 4.97 | 798,554 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,943 |
| English First Names of the Middle Ages | 0 | - | 4.47 | 60,772 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,728 |
| The Reign of Queen Elizabeth II | 0 | - | 4.36 | 35,872 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 357,890 |
| WWII for Dummies | 0 | - | 4.78 | 105,153 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 192,881 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 151,395 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 219,276 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 87,334 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 35,041 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 311,134 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 172,740 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 89,521 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 128,363 |
| Slavic Countries | 0 | - | 4.96 | 111,851 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 94,140 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,367 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,837 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,259 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,333 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,709 |
| The Reign of Henry VIII | 0 | - | 4.25 | 27,789 |
| Elizabeth I... or Elizabeth II? | 0 | - | 4.30 | 24,525 |
| Champions League Winners | 0 | - | 4.91 | 1,009,432 |
| Communist Countries in History | 0 | - | 4.63 | 496,399 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,056 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,776 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,558 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,351 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,928 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 96,018 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 137,801 |
| Three Band Flags of Europe | 0 | - | 4.98 | 193,646 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,350 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,745 |
| Pixelated Europe Map | 0 | - | 4.88 | 122,961 |
| European Countries with One Border | 0 | - | 4.97 | 183,070 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 179,849 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,293 |
| European Geography By Letter - B #2 | 0 | - | 4.84 | 84,187 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 261,858 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 114,988 |
| Russia Country Quiz | 0 | - | 4.83 | 114,667 |
| Federal Subjects of Russia | 0 | - | 4.95 | 147,919 |
| Countries That Border Russia | 0 | - | 4.98 | 462,701 |
| Croatia Country Quiz | 0 | - | 4.83 | 43,449 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 125,061 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,405 |
| History of Austria | 0 | - | 4.70 | 17,900 |
| Andorra Country Quiz | 0 | - | 4.91 | 31,756 |
| Regions of France Map Quiz | 0 | - | 4.97 | 144,755 |
| France Cities Map Quiz | 0 | - | 4.96 | 167,078 |
| Departments of France | 0 | - | 4.93 | 54,409 |
| Geography of the French Empire | 0 | - | 4.45 | 27,151 |
| The French Revolution | 0 | - | 4.47 | 24,053 |
| Countries Bordering France | 0 | - | 4.83 | 403,425 |
| Kings of France Quiz | 0 | - | 4.20 | 32,805 |
| History of France | 0 | - | 4.59 | 57,240 |
| French History A-Z | 0 | - | 4.27 | 24,748 |
| Germany Country Quiz | 0 | - | 4.83 | 158,131 |
| States of Germany Map Quiz | 0 | - | 4.92 | 133,104 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 126,575 |
| States of Germany | 0 | - | 4.95 | 153,085 |
| Germany Immigration by Country | 0 | - | 4.85 | 81,245 |
| Countries Bordering Germany | 0 | - | 4.99 | 370,525 |
| The Life of Alexander the Great | 0 | - | 4.51 | 18,518 |
| Most-Mentioned Characters in the Iliad | 0 | - | 4.81 | 20,829 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,593 |
| Regions of Italy | 0 | - | 4.92 | 76,192 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 149,617 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 152,273 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,604 |
| The Life of Julius Caesar | 0 | - | 4.39 | 39,120 |
| Seven Hills of Rome | 0 | - | 4.70 | 9,202 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 52,385 |
| The Vikings! | 0 | - | 4.46 | 28,367 |
| The Portuguese Empire | 0 | - | 4.58 | 12,081 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 97,085 |
| Regions of Spain Quiz | 0 | - | 4.90 | 114,316 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 186,108 |
| Cantons of Switzerland | 0 | - | 4.98 | 51,378 |
| Countries and Territories of the United Kingdom | 0 | - | 4.90 | 94,121 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,932 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,398 |
| Countries the UK Declared War On | 0 | - | 4.55 | 122,638 |
| Geography of the British Empire | 0 | - | 4.48 | 39,733 |
| The Reign of Queen Victoria | 0 | - | 4.33 | 23,478 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,851 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,740 |
| England or Wales? | 0 | - | 4.94 | 45,783 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 130,922 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,077 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,343 |
| Monarchies of Asia | 0 | - | 4.97 | 71,194 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,301 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,046 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,993 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,404 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,361 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,338 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,706,745 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,293 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,612 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 71,175 |
| Top 10 European Countries by Coastline | 0 | - | 4.87 | 138,492 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,964 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 65,592 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,931 |
| Countries that Border Poland | 0 | - | 4.99 | 172,564 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,961 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 101,403 |
| Countries that Border Hungary | 0 | - | 4.98 | 104,392 |
| Countries Bordering Serbia | 0 | - | 4.96 | 92,630 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,845 |
| Countries Bordering Austria | 0 | - | 4.97 | 118,630 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,953 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 72,266 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 97,249 |
| Ancient Greek Trivia | 0 | - | 4.62 | 67,064 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,945 |
| Counties of Ireland | 0 | - | 4.92 | 195,923 |
| Italian History A-Z | 0 | - | 4.21 | 17,735 |
| Countries Bordering Italy | 0 | - | 4.94 | 101,004 |
| Countries Closest to Italy | 0 | - | 4.97 | 198,293 |
| Byzantine History | 0 | - | 4.91 | 28,907 |
| Byzantine Emperors | 0 | - | 4.92 | 14,342 |
| History of The Netherlands | 0 | - | 4.46 | 17,474 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,213 |
| Spanish History A-Z | 0 | - | 4.37 | 19,320 |
| Countries Closest to Spain | 0 | - | 4.96 | 227,310 |
| British Acronyms | 0 | - | 4.40 | 45,841 |
| British Monopoly Board | 0 | - | 4.52 | 41,190 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 131,196 |
| Medieval English History | 0 | - | 4.53 | 43,563 |
