| Monarchies of Europe | 0 | - | 4.90 | 97,335 |
| Name the English Monarchs | 0 | - | 4.92 | 497,971 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,339 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,278 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,964 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,440 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,125 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,023 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,528 |
| Monarchies of Asia | 0 | - | 4.97 | 70,611 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,743 |
| Countries That Border Russia | 0 | - | 4.98 | 458,947 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,259 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,126 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,152 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,576 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,192 |
| Russia Country Quiz | 0 | - | 4.85 | 113,648 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,858 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,041 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,273 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,236 |
| Countries that Border Poland | 0 | - | 4.99 | 171,368 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,382 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,705 |
| Romania Country Quiz | 0 | - | 4.63 | 53,359 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,764 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,909 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,620 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,543 |
| Kings of France Quiz | 0 | - | 4.20 | 32,558 |
| The Trojan War | 0 | - | 4.83 | 39,434 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,995 |
| Name that Greek Letter | 0 | - | 4.94 | 321,701 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,546 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,056 |
| Roman Emperors | 0 | - | 4.95 | 118,498 |
| Countries That Use the Euro | 0 | - | 4.96 | 103,024 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,329 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,586 |
| The Only European Country ... | 0 | - | 4.91 | 213,882 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,564 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,913 |
| History of Italy | 0 | - | 4.55 | 31,817 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,483 |
| History of The Netherlands | 0 | - | 4.46 | 17,311 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,983 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,414 |
| Houses of British Monarchs | 0 | - | 4.53 | 65,299 |
| Zone 1 London Underground Stations - With a Map | 0 | - | 4.90 | 51,953 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,226,914 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,319,904 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,723 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,298 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,368 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,479 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,867 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,953 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,275 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,213 |
| Slavic Countries | 0 | - | 4.96 | 110,872 |
| Russian History A-Z | 0 | - | 4.38 | 30,853 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,242 |
| Ancient Greek Words | 0 | - | 4.92 | 110,711 |
| Counties of England | 0 | - | 4.97 | 789,305 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,984 |
| European Geography By Letter - A | 0 | - | 4.56 | 132,420 |
| European Geography By Letter - B #1 | 0 | - | 4.67 | 110,921 |
| European Geography By Letter - C | 0 | - | 4.46 | 111,869 |
| European Geography By Letter - D | 0 | - | 4.50 | 106,726 |
| European Geography By Letter - L | 0 | - | 4.52 | 112,229 |
| European Geography By Letter - M | 0 | - | 4.61 | 128,912 |
| European Geography By Letter - N | 0 | - | 4.44 | 99,681 |
| European Geography By Letter - R | 0 | - | 4.42 | 92,638 |
| European Geography By Letter - V | 0 | - | 4.43 | 92,030 |
| European Geography By Letter - T | 0 | - | 4.41 | 81,320 |
| European Geography By Letter - S #1 | 0 | - | 4.63 | 99,608 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,750 |
| Most Mentioned Allies of Russia | 0 | - | 4.49 | 37,801 |
| Most Mentioned Enemies of Russia | 0 | - | 4.69 | 89,573 |
| Ancient Greece A-Z | 0 | - | 4.60 | 22,984 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,592 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,622 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,051 |
| British History A-Z #1 | 0 | - | 4.45 | 45,842 |
| Champions League Winners | 0 | - | 4.92 | 996,477 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,347 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 95,048 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,408 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,878 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,228 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,830 |
| European Countries with One Border | 0 | - | 4.97 | 181,644 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,538 |
| Category Elimination - European Geography #3 | 0 | - | 4.85 | 79,806 |
| Albania Country Quiz | 0 | - | 4.54 | 38,661 |
| Czech Republic Country Quiz | 0 | - | 4.52 | 41,867 |
| Ukraine Country Quiz | 0 | - | 4.42 | 47,322 |
| Hungary Country Quiz | 0 | - | 4.49 | 43,042 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,217 |
| Serbia Country Quiz | 0 | - | 4.44 | 34,772 |
| History of Austria | 0 | - | 4.70 | 17,753 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,158 |
| Geography of the French Empire | 0 | - | 4.48 | 26,936 |
| The French Revolution | 0 | - | 4.46 | 23,785 |
| Countries Bordering France | 0 | - | 4.83 | 399,213 |
| History of France | 0 | - | 4.59 | 56,066 |
| States of Germany Map Quiz | 0 | - | 4.91 | 131,699 |
| States of Germany | 0 | - | 4.96 | 150,093 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,385 |
| Germany Immigration by Country | 0 | - | 4.84 | 80,026 |
| Countries Bordering Germany | 0 | - | 4.99 | 367,081 |
| Regions of Italy | 0 | - | 4.92 | 74,736 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,824 |
| The Vikings! | 0 | - | 4.46 | 28,246 |
| The Portuguese Empire | 0 | - | 4.54 | 11,992 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,365 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,201 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,943 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,227 |
| The British Royal Family - Modern Times | 0 | - | 4.16 | 21,464 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,335 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,180 |
| English Royal Consorts | 0 | - | 4.37 | 37,165 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,791 |
| Geography of the British Empire | 0 | - | 4.48 | 39,476 |
| The Reign of Queen Elizabeth I | 0 | - | 4.53 | 31,614 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,436 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,004 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,434 |
| Battle to Country | 0 | - | 4.91 | 52,533 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,909 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,104 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,093 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,530 |
| European Geography By Letter - E | 0 | - | 4.23 | 112,229 |
| European Geography By Letter - F | 0 | - | 4.17 | 91,675 |
| European Geography By Letter - H | 0 | - | 4.30 | 94,914 |
| European Geography By Letter - G | 0 | - | 4.25 | 101,290 |
| European Geography By Letter - I | 0 | - | 4.10 | 94,502 |
| European Geography By Letter - K | 0 | - | 4.14 | 69,179 |
| European Geography By Letter - O | 0 | - | 4.28 | 61,928 |
| European Geography by Letter - W | 0 | - | 4.20 | 82,301 |
| European Geography By Letter - S #2 | 0 | - | 4.19 | 50,519 |
| European Geography A-Z | 0 | - | 4.28 | 49,007 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,237 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,835 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,265 |
| Latvia Country Quiz | 0 | - | 4.75 | 31,774 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,214 |
| Departments of France | 0 | - | 4.93 | 52,842 |
| Germany Country Quiz | 0 | - | 4.82 | 156,570 |
| Germany Cities Map Quiz | 0 | - | 4.86 | 125,161 |
| German History A-Z | 0 | - | 4.49 | 24,241 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,780 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,772 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,979 |
| Italy Country Quiz | 0 | - | 4.82 | 122,224 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,404 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,089 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,961 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,372 |
| Byzantine History | 0 | - | 4.91 | 28,623 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,959 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,650 |
| British Acronyms | 0 | - | 4.39 | 45,621 |
| British Monopoly Board | 0 | - | 4.52 | 41,036 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,303 |
| Medieval English History | 0 | - | 4.53 | 43,323 |
| England or Wales? | 0 | - | 4.94 | 45,322 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,510 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,498 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,734 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,575 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,105 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,655,098 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,092 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,795 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,599 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,861 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,065 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,846 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,984 |
| The Only Remaining European Country . . . | 0 | - | 4.41 | 63,788 |
| Slovenia Country Quiz | 0 | - | 4.55 | 30,480 |
| Poland Country Quiz | 0 | - | 4.22 | 62,685 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,515 |
| Countries Invaded by the USSR | 0 | - | 4.29 | 93,557 |
| Slovakia Country Quiz | 0 | - | 4.64 | 30,437 |
| Bulgaria Country Quiz | 0 | - | 4.55 | 30,668 |
| Montenegro Country Quiz | 0 | - | 4.60 | 23,541 |
| Belarus Country Quiz | 0 | - | 4.74 | 27,223 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,519 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,402 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,784 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,539 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,808 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,388 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,361 |
