| European Countries by First 2 Letters | 0 | - | 4.95 | 526,362 |
| Most Guessed Cities in Europe - Not Capitals | 0 | - | 4.82 | 86,855 |
| Countries with the Most Skyscrapers | 0 | - | 4.92 | 143,438 |
| U.S. Cities with the Most Skyscrapers | 0 | - | 4.89 | 95,319 |
| Countries with the Tallest Buildings | 0 | - | 4.93 | 103,739 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,336 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,272 |
| Category Elimination - European Geography #3 | 0 | - | 4.85 | 79,799 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,584 |
| Official European Union Languages | 0 | - | 4.97 | 236,559 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,707 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,216 |
| Pre-Euro Currencies | 0 | - | 4.44 | 52,450 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,541 |
| Countries that Beat Switzerland | 0 | - | 4.88 | 41,569 |
| Tall Building Cities - United States | 0 | - | 4.48 | 68,261 |
| Add A Letter - Make a European City | 0 | - | 4.90 | 23,242 |
| Celtic Nations | 0 | - | 4.69 | 46,812 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,840 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,911 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,049 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,948 |
| European Geography By Letter - A | 0 | - | 4.56 | 132,418 |
| European Geography By Letter - B #1 | 0 | - | 4.67 | 110,918 |
| European Geography By Letter - C | 0 | - | 4.46 | 111,867 |
| European Geography By Letter - D | 0 | - | 4.50 | 106,724 |
| European Geography By Letter - L | 0 | - | 4.52 | 112,227 |
| European Geography By Letter - M | 0 | - | 4.61 | 128,907 |
| European Geography By Letter - N | 0 | - | 4.44 | 99,680 |
| European Geography By Letter - R | 0 | - | 4.42 | 92,636 |
| European Geography By Letter - V | 0 | - | 4.43 | 92,029 |
| European Geography By Letter - T | 0 | - | 4.41 | 81,316 |
| European Geography By Letter - S #1 | 0 | - | 4.63 | 99,606 |
| Famous Germans | 0 | - | 4.50 | 54,619 |
| Famous Italians by Clue | 0 | - | 4.45 | 88,531 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,342 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,222 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,148 |
| Federal Subjects of Russia | 0 | - | 4.94 | 144,013 |
| States of Germany | 0 | - | 4.96 | 150,074 |
| Germany Immigration by Country | 0 | - | 4.84 | 80,020 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,521 |
| Regions of Italy | 0 | - | 4.92 | 74,730 |
| Netherlands Immigration by Country | 0 | - | 4.94 | 43,816 |
| Regions of Spain Quiz | 0 | - | 4.90 | 112,357 |
| Cantons of Switzerland | 0 | - | 4.98 | 50,197 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,226 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,419 |
| Champions League Winners | 0 | - | 4.92 | 996,398 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,004 |
| Cities with the Tallest Buildings | 0 | - | 4.17 | 84,336 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,558 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,225 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,181 |
| Departments of France | 0 | - | 4.93 | 52,831 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,369 |
| England or Wales? | 0 | - | 4.94 | 45,319 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,501 |
| European Geography By Letter - E | 0 | - | 4.23 | 112,226 |
| European Geography By Letter - F | 0 | - | 4.17 | 91,672 |
| European Geography By Letter - H | 0 | - | 4.30 | 94,911 |
| European Geography By Letter - G | 0 | - | 4.25 | 101,289 |
| European Geography By Letter - I | 0 | - | 4.10 | 94,500 |
| European Geography By Letter - K | 0 | - | 4.14 | 69,177 |
| European Geography By Letter - O | 0 | - | 4.28 | 61,927 |
| European Geography by Letter - W | 0 | - | 4.20 | 82,300 |
| European Geography By Letter - S #2 | 0 | - | 4.19 | 50,517 |
| European Geography A-Z | 0 | - | 4.28 | 49,006 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,599 |
| Word Scramble - European Countries | 0 | - | 4.70 | 140,994 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,056 |
| Slavic Languages | 0 | - | 4.67 | 53,986 |
| Capitals of Italian Regions | 0 | - | 4.62 | 36,429 |
| The Mafia Quiz | 0 | - | 4.46 | 23,206 |
| History of The Netherlands | 0 | - | 4.46 | 17,311 |
| Spanish Immigration by Country | 0 | - | 4.63 | 55,249 |
| Name a Major European City A-Z | 0 | - | 4.33 | 49,132 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 64,844 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,514 |
| Famous Swiss and Austrian People | 0 | - | 4.45 | 14,555 |
| Famous Dutch and Belgian People | 0 | - | 4.56 | 17,962 |
| France A-Z | 0 | - | 4.16 | 38,057 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,963 |
| Name that Greek Letter | 0 | - | 4.94 | 321,685 |
| Switzerland A-Z | 0 | - | 4.45 | 25,508 |
| Africa A-Z | 0 | - | 4.57 | 46,373 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,540 |
| Top European Languages on a Map | 0 | - | 4.77 | 131,138 |
| Famous Russians | 0 | - | 4.16 | 23,728 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| Russia Multiple Choice | 0 | - | 4.58 | 40,566 |
| Famous French People | 0 | - | 4.12 | 27,953 |
| Ancient Greece A-Z | 0 | - | 4.60 | 22,984 |
| The Trojan War | 0 | - | 4.83 | 39,429 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,542 |
| Famous Irish People | 0 | - | 4.05 | 45,855 |
| History of Italy | 0 | - | 4.55 | 31,817 |
| Italy Multiple Choice | 0 | - | 4.74 | 103,166 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,051 |
| Roman Emperors | 0 | - | 4.95 | 118,495 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,482 |
| Famous Nordic People | 0 | - | 4.34 | 19,858 |
| Famous Spaniards Quiz | 0 | - | 4.24 | 11,545 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,982 |
| The British Royal Family - Modern Times | 0 | - | 4.16 | 21,463 |
| People on Money - England | 0 | - | 4.29 | 16,564 |
| English Monarchs in Order by First Letter | 0 | - | 4.38 | 31,329 |
| London A-Z | 0 | - | 4.10 | 40,638 |
| Asian Cities A-Z by Clue | 0 | - | 4.51 | 34,251 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,110 |
| Countries with the Most Skyscrapers per Capita | 0 | - | 4.69 | 72,157 |
| 100 Most Common English Words | 0 | - | 4.88 | 1,304,942 |
| Australian Capitals | 0 | - | 4.92 | 62,594 |
| Major non-NATO U.S. Allies | 0 | - | 4.52 | 51,745 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,553 |
| Europe Geography Quiz #1 | 0 | - | 4.54 | 70,992 |
| Europe Geography Quiz #2 | 0 | - | 4.57 | 71,618 |
| Europe Geography Quiz #4 | 0 | - | 4.57 | 69,946 |
| Europe Geography Quiz #5 | 0 | - | 4.54 | 60,987 |
| Four Letter European Geography #1 | 0 | - | 4.44 | 27,154 |
| Capitals of French Regions | 0 | - | 4.45 | 15,987 |
| Regions of France | 0 | - | 4.78 | 119,264 |
| France Immigration by Country | 0 | - | 4.72 | 75,968 |
| German Groups of Things | 0 | - | 4.46 | 38,306 |
| Capitals of German States | 0 | - | 4.74 | 28,812 |
| Chancellors of Germany, 1949–present | 0 | - | 4.60 | 23,096 |
| Germany True or False? | 0 | - | 4.61 | 48,535 |
| Largest Islands of Greece | 0 | - | 4.59 | 47,465 |
| Olympian Gods Quiz | 0 | - | 4.96 | 496,199 |
| Ancient Greek Words | 0 | - | 4.92 | 110,707 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,829 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 48,045 |
| Foods in a Full English Breakfast | 0 | - | 4.46 | 101,965 |
| Name Every Beatles Song | 0 | - | 4.97 | 234,114 |
| Bohemian Rhapsody Lyrics | 0 | - | 4.98 | 290,348 |
| Famous Scottish People | 0 | - | 4.22 | 18,326 |
| Asian Geography By Letter - A | 0 | - | 4.64 | 70,833 |
| Asian Geography by Letter - H | 0 | - | 4.49 | 65,397 |
| Asian Geography By Letter - M | 0 | - | 4.47 | 61,167 |
| Asian Geography by Letter - P | 0 | - | 4.45 | 57,567 |
| Asian Geography by Letter - T | 0 | - | 4.50 | 57,078 |
| Asian Geography By Letter - L | 0 | - | 4.49 | 42,719 |
| Middle East A-Z | 0 | - | 4.47 | 45,789 |
| Most Common English Verbs - Extreme | 0 | - | 4.96 | 155,811 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,430 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,355 |
| Canada A-Z | 0 | - | 4.73 | 32,652 |
| European Physical Geography | 0 | - | 4.26 | 33,374 |
| Geography of Russia | 0 | - | 4.57 | 21,428 |
| Russian History A-Z | 0 | - | 4.38 | 30,843 |
| Slovakia... or Slovenia? | 0 | - | 4.69 | 41,777 |
| History of Austria | 0 | - | 4.70 | 17,748 |
| Geography of the French Empire | 0 | - | 4.48 | 26,935 |
| The French Revolution | 0 | - | 4.46 | 23,785 |
| France Multiple Choice | 0 | - | 4.38 | 40,635 |
| History of France | 0 | - | 4.59 | 56,056 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.41 | 23,384 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 433,581 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,618 |
| The Vikings! | 0 | - | 4.46 | 28,246 |
| Sweden Immigration by Country | 0 | - | 4.55 | 55,700 |
| The Portuguese Empire | 0 | - | 4.54 | 11,991 |
| American to British Word Translation | 0 | - | 4.06 | 118,288 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,703 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,394 |
| Champions League Top 4 | 0 | - | 4.77 | 133,822 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,530 |
| Asia Map Quiz | 0 | - | 4.99 | 907,078 |
| A Quiz About Islam | 0 | - | 4.31 | 48,209 |
| Countries That Don't Recognize Israel | 0 | - | 4.63 | 34,448 |
| Countries of Africa | 0 | - | 5.00 | 2,508,045 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,821 |
| African East Coast | 0 | - | 4.96 | 95,057 |
| Western Africa Map Quiz | 0 | - | 4.97 | 72,929 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 49,807 |
| Australia Map Quiz | 0 | - | 4.94 | 342,501 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,538 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,079 |
| U.S. Federal Holidays | 0 | - | 4.33 | 99,100 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,987 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,223 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 210,159 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 92,211 |
| Countries That Use the Euro | 0 | - | 4.96 | 103,005 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 362,314 |
| Europe Geography Quiz #3 | 0 | - | 4.34 | 63,398 |
| 10 Easternmost Countries in Europe | 0 | - | 4.89 | 113,571 |
| Country Codes of Europe | 0 | - | 3.46 | 13,653 |
| The Only European Country ... | 0 | - | 4.91 | 213,849 |
| European Countries NOT in NATO | 0 | - | 4.87 | 59,546 |
| Austria... or Australia? | 0 | - | 4.68 | 103,873 |
| Presidents of France | 0 | - | 4.25 | 23,903 |
| Word Chain - France | 0 | - | 4.38 | 42,583 |
| Ancient Greek Trivia | 0 | - | 4.62 | 66,779 |
| Geography of Ancient Greece | 0 | - | 4.69 | 31,771 |
| Figures from Greek Mythology | 0 | - | 4.91 | 184,965 |
| Italian Foods | 0 | - | 4.31 | 72,200 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,955 |
| Kings of Spain Quiz | 0 | - | 4.14 | 13,959 |
| Canary Islands | 0 | - | 4.61 | 17,404 |
