| Federal Subjects of Russia | 0 | - | 4.94 | 133,523 |
| Europe Geography Decoder | 0 | - | 4.85 | 67,683 |
| European Countries by First 2 Letters | 0 | - | 4.96 | 513,779 |
| Add A Letter - Make a European City | 0 | - | 4.87 | 22,556 |
| Save Europeans by Guessing Countries | 0 | - | 4.85 | 197,019 |
| Category Elimination - European Geography #3 | 0 | - | 4.85 | 75,309 |
| Countries That Border Russia | 0 | - | 4.98 | 448,989 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 220,918 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 266,047 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 157,848 |
| Russia Country Quiz | 0 | - | 4.83 | 110,482 |
| German Groups of Things | 0 | - | 4.46 | 37,663 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 66,079 |
| Official European Union Languages | 0 | - | 4.98 | 230,104 |
| European Countries in their Native Language | 0 | - | 4.99 | 152,505 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 413,360 |
| Word Scramble - European Countries | 0 | - | 4.74 | 136,898 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 80,498 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.84 | 41,082 |
| Countries that Beat Switzerland | 0 | - | 4.87 | 40,553 |
| British Groups of Things | 0 | - | 4.25 | 82,139 |
| Celtic Nations | 0 | - | 4.74 | 46,201 |
| Europe Geography Quiz #1 | 0 | - | 4.54 | 69,867 |
| Europe Geography Quiz #2 | 0 | - | 4.57 | 70,407 |
| Europe Geography Quiz #4 | 0 | - | 4.57 | 68,891 |
| Europe Geography Quiz #5 | 0 | - | 4.54 | 60,073 |
| Most Guessed Cities in Europe - Not Capitals | 0 | - | 4.85 | 84,772 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 301,038 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.99 | 150,886 |
| Four Letter European Geography #1 | 0 | - | 4.50 | 25,147 |
| Four Letter European Geography #2 | 0 | - | 4.55 | 18,049 |
| Most Mentioned Allies of Russia | 0 | - | 4.48 | 36,881 |
| Most Mentioned Enemies of Russia | 0 | - | 4.70 | 87,654 |
| Germany Multiple Choice | 0 | - | 4.83 | 52,591 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 330,637 |
| Africa Geography Quiz #1 | 0 | - | 4.92 | 48,105 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 107,218 |
| Catholic Countries in Europe | 0 | - | 4.83 | 90,955 |
| European Geography By Letter - B #2 | 0 | - | 4.81 | 66,590 |
| Famous Russians Quiz | 0 | - | 4.16 | 23,287 |
| Word Chain - Russia | 0 | - | 4.36 | 15,428 |
| States of Germany | 0 | - | 4.95 | 141,022 |
| Germany Immigration by Country | 0 | - | 4.86 | 76,895 |
| Counties of Ireland | 0 | - | 4.91 | 178,931 |
| Regions of Italy | 0 | - | 4.91 | 69,597 |
| Netherlands Immigration by Country | 0 | - | 4.93 | 35,767 |
| Regions of Spain Quiz | 0 | - | 4.89 | 106,432 |
| Cantons of Switzerland | 0 | - | 4.97 | 46,509 |
| Champions League Winners | 0 | - | 4.92 | 960,567 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.70 | 56,809 |
| History of Russia Quiz | 0 | - | 4.48 | 31,289 |
| Geography of Russia | 0 | - | 4.56 | 21,022 |
| States of the German Confederation in 1848 | 0 | - | 4.86 | 29,863 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 16,836 |
| Category Elimination - African Geography #1 | 0 | - | 4.91 | 87,469 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.95 | 168,357 |
| Europe Geography Quiz #3 | 0 | - | 4.33 | 62,407 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.83 | 33,842 |
| Departments of France | 0 | - | 4.90 | 46,584 |
| Word Chain - France | 0 | - | 4.37 | 41,857 |
| Countries Surrounding Rome | 0 | - | 4.96 | 48,486 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,565 |
| England or Wales? | 0 | - | 4.94 | 43,766 |
| All UEFA Champions League Teams Ever | 0 | - | 4.83 | 122,845 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.89 | 103,509 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 91,450 |
| Countries of Africa - One Minute Sprint | 0 | - | 4.41 | 309,917 |
| Pre-Euro Currencies | 0 | - | 4.43 | 51,615 |
| Top 20 Football Clubs in Europe | 0 | - | 4.47 | 106,399 |
| Name a Major European City A-Z | 0 | - | 4.32 | 47,464 |
| 100 Longest Rivers in Europe - with a Map | 0 | - | 4.94 | 62,207 |
| Slavic Languages | 0 | - | 4.65 | 52,349 |
| Countries that Border Poland | 0 | - | 4.99 | 167,430 |
| Countries that Border Hungary | 0 | - | 4.98 | 101,748 |
| Moldova Country Quiz | 0 | - | 4.81 | 29,540 |
| Countries Bordering Serbia | 0 | - | 4.96 | 89,103 |
| French Geography Quiz #1 | 0 | - | 4.88 | 33,459 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 620,700 |
| Capitals of Italian Regions | 0 | - | 4.61 | 35,795 |
| Spanish Immigration by Country | 0 | - | 4.63 | 54,388 |
| Fictional Characters from Great Britain | 0 | - | 4.11 | 31,849 |
| Word Scramble - Asian Countries | 0 | - | 4.49 | 85,430 |
| Countries of Asia - One Minute Sprint | 0 | - | 4.43 | 264,961 |
| African Countries by First 2 Letters | 0 | - | 4.95 | 260,236 |
| California Groups of Things | 0 | - | 4.24 | 44,578 |
| New York Groups of Things | 0 | - | 4.36 | 59,182 |
| U.S. History Groups of Two | 0 | - | 4.23 | 43,524 |
| Top European Languages on a Map | 0 | - | 4.78 | 127,205 |
| Russia Multiple Choice | 0 | - | 4.57 | 39,841 |
| Countries that Beat Russia | 0 | - | 4.83 | 78,703 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.85 | 93,892 |
| Word Chain - Germany | 0 | - | 4.32 | 22,093 |
| The Trojan War | 0 | - | 4.81 | 38,196 |
| Name that Greek Letter | 0 | - | 4.93 | 313,378 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.84 | 104,420 |
| Word Chain - Italy | 0 | - | 4.07 | 22,785 |
| Italy Multiple Choice | 0 | - | 4.74 | 100,478 |
| Ancient Roman Trivia #1 | 0 | - | 4.83 | 79,575 |
| Roman Emperors | 0 | - | 4.96 | 110,957 |
| Geography of the Dutch Empire | 0 | - | 4.68 | 33,785 |
| Most Common Last Names in Sweden | 0 | - | 4.49 | 14,923 |
| Countries of the Spanish Empire | 0 | - | 4.51 | 76,392 |
| Word Chain - United Kingdom | 0 | - | 4.06 | 28,928 |
| Name a Valid English City | 0 | - | 4.19 | 16,240 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 270,474 |
| Famous People from Africa | 0 | - | 4.45 | 10,673 |
| Africa Geography Quiz #2 | 0 | - | 4.59 | 32,303 |
| Word Chain - Africa | 0 | - | 4.48 | 30,965 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 25,677 |
| Name a Valid Answer - United States #1 | 0 | - | 4.63 | 91,298 |
| European Geography By Letter - A | 0 | - | 4.61 | 129,814 |
| European Geography By Letter - B #1 | 0 | - | 4.70 | 108,340 |
| European Geography By Letter - C | 0 | - | 4.46 | 109,459 |
| European Geography By Letter - D | 0 | - | 4.51 | 104,175 |
| European Geography By Letter - L | 0 | - | 4.52 | 109,604 |
| European Geography By Letter - M | 0 | - | 4.53 | 118,854 |
| European Geography By Letter - P | 0 | - | 4.79 | 94,047 |
| European Geography By Letter - N | 0 | - | 4.43 | 97,530 |
| European Geography By Letter - R | 0 | - | 4.41 | 90,723 |
| European Geography By Letter - V | 0 | - | 4.44 | 90,016 |
| Europe Map Quiz | 0 | - | 5.00 | 4,601,851 |
| European Geography By Letter - S #1 | 0 | - | 4.61 | 97,557 |
| Capitals of French Regions | 0 | - | 4.42 | 15,618 |
| Regions of France | 0 | - | 4.74 | 113,230 |
| France Immigration by Country | 0 | - | 4.77 | 74,012 |
| Famous Germans | 0 | - | 4.42 | 40,778 |
| Capitals of German States | 0 | - | 4.72 | 28,320 |
| Chancellors of Germany, 1949–present | 0 | - | 4.57 | 22,282 |
| Germany True or False? | 0 | - | 4.63 | 47,280 |
| Largest Islands of Greece | 0 | - | 4.59 | 45,222 |
| Olympian Gods Quiz | 0 | - | 4.96 | 474,250 |
| Ancient Greek Words | 0 | - | 4.92 | 106,605 |
| Famous Italians by Clue | 0 | - | 4.46 | 76,152 |
| Provinces of the Netherlands | 0 | - | 4.76 | 38,105 |
| 100 Greatest Britons Quiz | 0 | - | 4.41 | 47,422 |
| Foods in a Full English Breakfast | 0 | - | 4.45 | 98,941 |
| Beatles Songs Quiz | 0 | - | 4.96 | 225,621 |
| Bohemian Rhapsody Lyrics | 0 | - | 4.98 | 285,013 |
| Asia Geography Quiz #1 | 0 | - | 4.77 | 52,559 |
| Asia Geography Quiz #2 | 0 | - | 4.59 | 47,469 |
| Asia Geography Quiz #3 | 0 | - | 4.49 | 31,693 |
| Groups of Things - The Bible | 0 | - | 4.42 | 53,610 |
| Africa Map Quiz | 0 | - | 5.00 | 2,051,744 |
| Oceania Map Quiz | 0 | - | 4.98 | 611,848 |
| Australian Capitals | 0 | - | 4.92 | 62,041 |
| Word Chain - Australia | 0 | - | 4.38 | 37,495 |
| European Physical Geography | 0 | - | 4.24 | 32,950 |
| Word Scramble - European Cities | 0 | - | 3.76 | 18,376 |
| Albania Country Quiz | 0 | - | 4.53 | 37,292 |
| Russian History A-Z | 0 | - | 4.37 | 18,516 |
| Croatia Country Quiz | 0 | - | 4.80 | 41,131 |
| Czech Republic Country Quiz | 0 | - | 4.51 | 40,599 |
| Slovakia... or Slovenia? | 0 | - | 4.70 | 41,033 |
| Ukraine Country Quiz | 0 | - | 4.41 | 45,800 |
| Hungary Country Quiz | 0 | - | 4.48 | 41,407 |
| Romania Country Quiz | 0 | - | 4.63 | 51,703 |
| Serbia Country Quiz | 0 | - | 4.43 | 33,757 |
| History of Austria | 0 | - | 4.69 | 17,305 |
| Geography of the French Empire | 0 | - | 4.51 | 26,358 |
| The French Revolution | 0 | - | 4.45 | 23,048 |
| France Multiple Choice | 0 | - | 4.37 | 40,112 |
| History of France Quiz | 0 | - | 4.56 | 41,968 |
| Biggest Cities in Germany in 1910 | 0 | - | 4.42 | 22,977 |
| History of Ireland Quiz | 0 | - | 4.44 | 20,435 |
| History of Italy | 0 | - | 4.54 | 31,226 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 421,463 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 53,446 |
| The Vikings! | 0 | - | 4.46 | 27,912 |
| Sweden Immigration by Country | 0 | - | 4.54 | 54,089 |
| The Portuguese Empire | 0 | - | 4.54 | 11,781 |
| American to British Word Translation | 0 | - | 4.02 | 115,090 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,029 |
| United Kingdom A-Z | 0 | - | 4.53 | 85,331 |
| Champions League Top 4 | 0 | - | 4.70 | 125,215 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,408,944 |
| Asia Map Quiz | 0 | - | 4.99 | 868,476 |
| Famous Duos Quiz #2 | 0 | - | 4.20 | 114,716 |
| Famous Duos Quiz #1 | 0 | - | 4.14 | 82,024 |
| Countries of Africa | 0 | - | 5.00 | 2,394,452 |
| African East Coast | 0 | - | 4.96 | 91,623 |
| Western Africa Map Quiz | 0 | - | 4.97 | 69,352 |
| Oceania Geography Quiz | 0 | - | 4.55 | 21,633 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 46,816 |
| Australia Map Quiz | 0 | - | 4.94 | 335,758 |
| Hispanic Last Names in the U.S. | 0 | - | 4.30 | 54,086 |
| South American Geography Quiz #2 | 0 | - | 4.64 | 38,515 |
| South American Geography Quiz #1 | 0 | - | 4.74 | 31,912 |
| Word Chain - South America | 0 | - | 4.50 | 23,325 |
| United States Map Quiz | 0 | - | 4.98 | 4,076,506 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 728,787 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 203,025 |
| Countries with Territorial Claims in Antarctica | 0 | - | 4.94 | 90,181 |
| Countries That Use the Euro | 0 | - | 4.96 | 82,769 |
| Europe Cities Map Quiz | 0 | - | 4.99 | 354,363 |
| European Geography By Letter - E | 0 | - | 4.22 | 109,812 |
| European Geography By Letter - F | 0 | - | 4.18 | 89,366 |
| European Geography By Letter - H | 0 | - | 4.29 | 93,068 |
| European Geography By Letter - G | 0 | - | 4.25 | 99,087 |
| European Geography By Letter - I | 0 | - | 4.11 | 92,556 |
| European Geography By Letter - K | 0 | - | 4.15 | 67,394 |
