| States of Germany Map Quiz | 0 | - | 4.91 | 131,598 |
| States of Germany | 0 | - | 4.96 | 149,878 |
| Germany Immigration by Country | 0 | - | 4.84 | 79,947 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,495 |
| History of Germany | 0 | - | 4.39 | 52,596 |
| Germany Country Quiz | 0 | - | 4.82 | 156,444 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,434 |
| Counties of England | 0 | - | 4.97 | 788,620 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,158 |
| Countries the UK Declared War On | 0 | - | 4.61 | 121,723 |
| Geography of the British Empire | 0 | - | 4.48 | 39,465 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,748 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,760 |
| Medieval English History | 0 | - | 4.53 | 43,297 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,831 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,332 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,289 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,025 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,946 |
| Regions of France Map Quiz | 0 | - | 4.97 | 143,034 |
| French History Multiple Choice | 0 | - | 4.55 | 32,860 |
| Countries Bordering Germany | 0 | - | 4.99 | 366,817 |
| Regions of Italy | 0 | - | 4.92 | 74,622 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,758 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,191 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,073 |
| Countries and Territories of the United Kingdom | 0 | - | 4.89 | 92,863 |
| Anglo-Saxon and Viking Kings of England | 0 | - | 4.74 | 12,084 |
| Europe Map Quiz | 0 | - | 5.00 | 4,728,702 |
| France Cities Map Quiz | 0 | - | 4.96 | 165,100 |
| Departments of France | 0 | - | 4.93 | 52,711 |
| Germany Cities Map Quiz | 0 | - | 4.87 | 125,076 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,373 |
| Italy Country Quiz | 0 | - | 4.82 | 122,117 |
| Regions of Italy Map Quiz | 0 | - | 4.96 | 148,284 |
| Italy Cities Map Quiz | 0 | - | 4.97 | 151,010 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,348 |
| Spain Cities Map Quiz | 0 | - | 4.87 | 95,896 |
| Regions of Spain Map Quiz | 0 | - | 4.95 | 184,551 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,160 |
| Anglo-Saxon Kingdoms of England | 0 | - | 4.60 | 25,685 |
| Giant Great Britain Millennium Quiz | 0 | - | 4.78 | 20,068 |
| England or Wales? | 0 | - | 4.94 | 45,289 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,111 |
| Countries With the Most German Speakers | 0 | - | 4.89 | 94,119 |
| Name the English Monarchs | 0 | - | 4.92 | 497,567 |
| Embarrassing Chapters in British History | 0 | - | 4.29 | 32,104 |
| History of Scotland | 0 | - | 4.51 | 20,994 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 424,958 |
| Andorra Country Quiz | 0 | - | 4.90 | 31,363 |
| Kings of France Quiz | 0 | - | 4.20 | 32,544 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,374 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,291 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,419 |
| German Inventions | 0 | - | 3.91 | 30,177 |
| Embarrassing Chapters in German History | 0 | - | 3.41 | 12,565 |
| The Trojan War | 0 | - | 4.83 | 39,403 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,434 |
| Name that Greek Letter | 0 | - | 4.94 | 321,487 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,418 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,004 |
| Roman Emperors | 0 | - | 4.95 | 118,353 |
| Malta Country Quiz | 0 | - | 4.81 | 30,800 |
| Countries That Use the Euro | 0 | - | 4.96 | 102,814 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,144 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,408 |
| The Only European Country ... | 0 | - | 4.91 | 213,599 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,384 |
| Olympian Gods Quiz | 0 | - | 4.96 | 495,289 |
| 101 Figures from Greek Mythology | 0 | - | 4.99 | 124,138 |
| History of The Netherlands | 0 | - | 4.46 | 17,302 |
| Former Dominions of the British Empire | 0 | - | 4.30 | 24,069 |
| Flags of Europe Quiz | 0 | - | 4.99 | 1,224,977 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,318,941 |
| History of Russia Quiz | 0 | - | 4.49 | 31,781 |
| 15 Most Populous Countries that Speak a Germanic Language | 0 | - | 4.39 | 82,285 |
| Ancient Greek Words | 0 | - | 4.92 | 110,605 |
| History of Italy | 0 | - | 4.55 | 31,805 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,470 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,966 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,366 |
| Oldest Cities in the United Kingdom | 0 | - | 4.39 | 23,605 |
| History of London | 0 | - | 4.33 | 26,095 |
| British History Multiple Choice #1 | 0 | - | 4.46 | 54,942 |
| British History Multiple Choice #2 | 0 | - | 4.42 | 37,819 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,413 |
| 10 Biggest European Countries by Area | 0 | - | 4.99 | 191,626 |
| 10 Westernmost Countries in Europe | 0 | - | 4.96 | 150,228 |
| Top 10 Languages Spoken in Europe | 0 | - | 4.96 | 216,146 |
| European Landmarks Map Quiz | 0 | - | 4.97 | 86,425 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,642 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,654 |
| Countries with Territory in the Balkans | 0 | - | 4.96 | 88,187 |
| Eastern Europe Map Quiz | 0 | - | 4.91 | 127,092 |
| Slavic Countries | 0 | - | 4.96 | 110,796 |
| Regions of France | 0 | - | 4.78 | 119,101 |
| France Immigration by Country | 0 | - | 4.72 | 75,931 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,423 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,250 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,575 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,743 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,031 |
| UK Cities Map Quiz | 0 | - | 4.95 | 461,989 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 101,891 |
| The UK for Americans - True or False | 0 | - | 4.46 | 58,376 |
| Champions League Winners | 0 | - | 4.92 | 995,494 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,283 |
| European Diaspora - Top 11 Countries | 0 | - | 4.90 | 94,986 |
| 10 European Countries with the Most Tourists | 0 | - | 4.98 | 136,267 |
| Three Band Flags of Europe | 0 | - | 4.98 | 191,726 |
| Pixelated Europe Map | 0 | - | 4.88 | 121,720 |
| Monarchies of Europe | 0 | - | 4.90 | 97,244 |
| European Countries with One Border | 0 | - | 4.97 | 181,512 |
| European Countries with the Fewest Borders | 0 | - | 4.97 | 178,088 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,156 |
| Federal Subjects of Russia | 0 | - | 4.94 | 143,739 |
| Countries That Border Russia | 0 | - | 4.98 | 458,662 |
| Countries Formerly in Yugoslavia | 0 | - | 4.95 | 124,129 |
| History of Austria | 0 | - | 4.70 | 17,742 |
| Austria Country Quiz | 0 | - | 4.57 | 59,304 |
| Belgium Country Quiz | 0 | - | 4.70 | 71,181 |
| France Country Quiz | 0 | - | 4.70 | 133,762 |
| French Inventions | 0 | - | 4.08 | 13,862 |
| Geography of the French Empire | 0 | - | 4.48 | 26,919 |
| The French Revolution | 0 | - | 4.46 | 23,757 |
| Countries Bordering France | 0 | - | 4.85 | 397,769 |
| History of Paris | 0 | - | 4.24 | 13,612 |
| History of France | 0 | - | 4.59 | 55,934 |
| German Cities with the Most Tourists | 0 | - | 4.77 | 48,158 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,911 |
| Greece Country Quiz | 0 | - | 4.74 | 65,723 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,760 |
| Embarrassing Chapters in Italian History | 0 | - | 4.24 | 12,034 |
| Luxembourg Country Quiz | 0 | - | 4.77 | 33,455 |
| Monaco Country Quiz | 0 | - | 4.47 | 41,207 |
| Netherlands Country Quiz | 0 | - | 4.50 | 79,921 |
| Nordic Cities Map Quiz | 0 | - | 4.74 | 89,731 |
| The Vikings! | 0 | - | 4.45 | 28,237 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,665 |
| Portugal Country Quiz | 0 | - | 4.69 | 71,303 |
| The Portuguese Empire | 0 | - | 4.54 | 11,984 |
| Spain Country Quiz | 0 | - | 4.45 | 127,533 |
| Switzerland Country Quiz | 0 | - | 4.51 | 62,913 |
| Counties of England Map Quiz | 0 | - | 4.97 | 305,998 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,179 |
| Largest Islands in the British Isles With a Map | 0 | - | 4.52 | 38,555 |
| British Geography Multiple Choice | 0 | - | 4.49 | 43,160 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,397 |
| Counties of Wales | 0 | - | 4.63 | 38,842 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,755 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,384 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,163 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,189 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,060 |
| Countries That Touch the Adriatic Sea | 0 | - | 4.96 | 70,763 |
| Top 10 European Countries by Coastline | 0 | - | 4.89 | 137,794 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,763 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,321 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,041 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 164,990 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,900 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 256,439 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,100 |
| Countries that Border Poland | 0 | - | 4.99 | 171,262 |
| Russia Country Quiz | 0 | - | 4.85 | 113,585 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,346 |
| Countries With the Most Russian Speakers | 0 | - | 4.97 | 98,259 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,807 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,638 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,006 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,673 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,498 |
| Countries Bordering Austria | 0 | - | 4.97 | 117,706 |
| Countries that Visit France the Most | 0 | - | 4.85 | 45,490 |
| Countries Closest to Metropolitan France | 0 | - | 4.89 | 71,771 |
| Embarrassing Chapters in French History | 0 | - | 3.67 | 20,037 |
| Most Popular Baby Girls Names in Germany | 0 | - | 4.51 | 38,616 |
| German History A-Z | 0 | - | 4.49 | 24,194 |
| Counties of Ireland | 0 | - | 4.92 | 192,881 |
| History of Ireland | 0 | - | 4.39 | 30,799 |
| Countries Bordering Italy | 0 | - | 4.94 | 100,399 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,920 |
| Countries Closest to Italy | 0 | - | 4.97 | 196,204 |
| Byzantine History | 0 | - | 4.91 | 28,595 |
| Canary Islands | 0 | - | 4.61 | 17,390 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,700 |
| Countries Closest to Spain | 0 | - | 4.96 | 225,179 |
| Switzerland Immigration by Country | 0 | - | 4.70 | 29,104 |
| British Spellings | 0 | - | 4.07 | 99,193 |
| British Groups of Things | 0 | - | 4.25 | 82,659 |
| British Acronyms | 0 | - | 4.39 | 45,606 |
| UK Immigration by Country | 0 | - | 4.94 | 139,520 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,942 |
| United Kingdom Country Quiz | 0 | - | 4.96 | 138,031 |
| Biggest Immigrant Groups by Decade in the UK | 0 | - | 4.62 | 24,401 |
| Counties of the UK and Ireland | 0 | - | 4.98 | 128,485 |
| Geography of Scotland | 0 | - | 4.63 | 21,468 |
| World Capitals Closest to London | 0 | - | 4.87 | 109,644 |
| 50 Busiest Air Routes from London | 0 | - | 4.86 | 95,722 |
| All UEFA Champions League Teams Ever | 0 | - | 4.84 | 128,353 |
