| Federal Subjects of Russia | 0 | - | 4.94 | 144,012 |
| Europe Geography Decoder | 0 | - | 4.86 | 69,541 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 526,358 |
| Add A Letter - Make a European City | 0 | - | 4.90 | 23,241 |
| Category Elimination - European Geography #3 | 0 | - | 4.85 | 79,797 |
| Countries That Border Russia | 0 | - | 4.98 | 458,933 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,554 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 274,225 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,179 |
| Russia Country Quiz | 0 | - | 4.85 | 113,640 |
| German Groups of Things | 0 | - | 4.46 | 38,306 |
| Count to 10 in Europe: Pro | 0 | - | 4.85 | 68,583 |
| Official European Union Languages | 0 | - | 4.97 | 236,546 |
| European Countries in their Native Language | 0 | - | 4.99 | 156,705 |
| Europe by Borders in 30 Seconds | 0 | - | 4.98 | 425,210 |
| Word Scramble - European Countries | 0 | - | 4.70 | 140,993 |
| Non-Bordering Countries Closest to Russia | 0 | - | 4.91 | 82,382 |
| Countries that Beat Switzerland | 0 | - | 4.88 | 41,569 |
| British Groups of Things | 0 | - | 4.25 | 82,671 |
| History of Russia Quiz | 0 | - | 4.49 | 31,795 |
| Celtic Nations | 0 | - | 4.69 | 46,812 |
| 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 | 69,945 |
| Europe Geography Quiz #5 | 0 | - | 4.54 | 60,987 |
| Most Guessed Cities in Europe - Not Capitals | 0 | - | 4.82 | 86,854 |
| Countries of Europe with an Empty Map | 0 | - | 5.00 | 307,834 |
| All First-Level Subdivisions of Europe on a Map | 0 | - | 4.98 | 167,907 |
| Four Letter European Geography #1 | 0 | - | 4.44 | 27,152 |
| Four Letter European Geography #2 | 0 | - | 4.57 | 19,613 |
| Most Mentioned Allies of Russia | 0 | - | 4.49 | 37,798 |
| Most Mentioned Enemies of Russia | 0 | - | 4.69 | 89,571 |
| Germany Multiple Choice | 0 | - | 4.84 | 54,049 |
| "Big Five" European Soccer Champions Since 2000 | 0 | - | 4.97 | 349,942 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,005 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,346 |
| European Geography By Letter - P #1 | 0 | - | 4.81 | 96,336 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,220 |
| European Geography By Letter - B #2 | 0 | - | 4.83 | 76,272 |
| Famous Russians | 0 | - | 4.16 | 23,728 |
| Word Chain - Russia | 0 | - | 4.33 | 15,685 |
| States of Germany | 0 | - | 4.96 | 150,063 |
| Germany Immigration by Country | 0 | - | 4.84 | 80,018 |
| 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 |
| Champions League Winners | 0 | - | 4.92 | 996,391 |
| Countries of Africa - One Minute Sprint | 0 | - | 4.42 | 319,351 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,148 |
| Geography of Russia | 0 | - | 4.57 | 21,428 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,520 |
| 10 Closest Megacities to London | 0 | - | 4.90 | 17,410 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,100 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,168 |
| Europe Geography Quiz #3 | 0 | - | 4.34 | 63,397 |
| Croatia Country Quiz | 0 | - | 4.83 | 42,854 |
| Bosnia and Herzegovina Country Quiz | 0 | - | 4.86 | 35,038 |
| Departments of France | 0 | - | 4.93 | 52,830 |
| Word Chain - France | 0 | - | 4.38 | 42,583 |
| Countries Surrounding Rome | 0 | - | 4.97 | 49,369 |
| United Kingdom Decoder | 0 | - | 4.29 | 39,947 |
| England or Wales? | 0 | - | 4.94 | 45,319 |
| All UEFA Champions League Teams Ever | 0 | - | 4.85 | 128,501 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,726 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,570 |
| Pre-Euro Currencies | 0 | - | 4.44 | 52,450 |
| European Countries with the Fewest Overnight Visitors | 0 | - | 4.78 | 41,599 |
| Top 20 Football Clubs in Europe | 0 | - | 4.48 | 113,054 |
| 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 |
| Slavic Languages | 0 | - | 4.67 | 53,986 |
| Countries that Border Poland | 0 | - | 4.99 | 171,361 |
| Countries that Border Hungary | 0 | - | 4.98 | 103,701 |
| North Macedonia Country Quiz | 0 | - | 4.81 | 27,618 |
| Moldova Country Quiz | 0 | - | 4.81 | 30,543 |
| Countries Bordering Serbia | 0 | - | 4.96 | 91,755 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,514 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 641,958 |
| Name that Greek Letter | 0 | - | 4.94 | 321,682 |
| Capitals of Italian Regions | 0 | - | 4.62 | 36,429 |
| Spanish Immigration by Country | 0 | - | 4.63 | 55,248 |
| Fictional Characters from Great Britain | 0 | - | 4.24 | 41,919 |
| Word Scramble - Asian Countries | 0 | - | 4.49 | 108,183 |
| Countries of Asia - One Minute Sprint | 0 | - | 4.41 | 273,125 |
| African Countries by First 2 Letters | 0 | - | 4.96 | 266,538 |
| California Groups of Things | 0 | - | 4.25 | 45,269 |
| New York Groups of Things | 0 | - | 4.38 | 59,943 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,242 |
| Top European Languages on a Map | 0 | - | 4.77 | 131,138 |
| Russia Multiple Choice | 0 | - | 4.58 | 40,566 |
| Countries that Beat Russia | 0 | - | 4.84 | 81,902 |
| Countries Bordering Ukraine, with an Empty Map | 0 | - | 4.86 | 95,908 |
| Word Chain - Germany | 0 | - | 4.31 | 22,475 |
| The Trojan War | 0 | - | 4.83 | 39,429 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 110,542 |
| History of Italy | 0 | - | 4.55 | 31,817 |
| Word Chain - Italy | 0 | - | 4.07 | 23,089 |
| Italy Multiple Choice | 0 | - | 4.74 | 103,166 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,050 |
| Roman Emperors | 0 | - | 4.95 | 118,494 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,482 |
| Most Common Last Names in Sweden | 0 | - | 4.49 | 15,286 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 76,982 |
| Word Chain - United Kingdom | 0 | - | 4.05 | 29,240 |
| Name a Valid English City | 0 | - | 4.19 | 16,631 |
| Asian Countries by First 2 Letters | 0 | - | 4.91 | 277,110 |
| Famous People from Africa | 0 | - | 4.45 | 10,858 |
| Africa Geography Quiz #2 | 0 | - | 4.59 | 32,808 |
| Word Chain - Africa | 0 | - | 4.47 | 31,441 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 26,870 |
| Name a Valid Answer - United States #1 | 0 | - | 4.61 | 93,450 |
| European Geography By Letter - A | 0 | - | 4.56 | 132,417 |
| European Geography By Letter - B #1 | 0 | - | 4.67 | 110,917 |
| European Geography By Letter - C | 0 | - | 4.46 | 111,866 |
| European Geography By Letter - D | 0 | - | 4.50 | 106,723 |
| European Geography By Letter - L | 0 | - | 4.52 | 112,226 |
| European Geography By Letter - M | 0 | - | 4.61 | 128,906 |
| European Geography By Letter - N | 0 | - | 4.44 | 99,679 |
| European Geography By Letter - R | 0 | - | 4.42 | 92,635 |
| European Geography By Letter - V | 0 | - | 4.43 | 92,029 |
| European Geography By Letter - T | 0 | - | 4.41 | 81,314 |
| Europe Map Quiz | 0 | - | 5.00 | 4,731,522 |
| European Geography By Letter - S #1 | 0 | - | 4.63 | 99,605 |
| Capitals of French Regions | 0 | - | 4.45 | 15,987 |
| Regions of France | 0 | - | 4.78 | 119,262 |
| France Immigration by Country | 0 | - | 4.72 | 75,968 |
| Famous Germans | 0 | - | 4.50 | 54,619 |
| 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 | 496,185 |
| Ancient Greek Words | 0 | - | 4.92 | 110,705 |
| Famous Italians by Clue | 0 | - | 4.45 | 88,529 |
| Provinces of the Netherlands | 0 | - | 4.80 | 40,828 |
| 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 | 234,111 |
| Bohemian Rhapsody Lyrics | 0 | - | 4.98 | 290,347 |
| Asia Geography Quiz #1 | 0 | - | 4.78 | 53,332 |
| Asia Geography Quiz #2 | 0 | - | 4.56 | 48,328 |
| Asia Geography Quiz #3 | 0 | - | 4.49 | 32,155 |
| Groups of Things - The Bible | 0 | - | 4.43 | 54,807 |
| Africa Map Quiz | 0 | - | 5.00 | 2,104,402 |
| Oceania Map Quiz | 0 | - | 4.98 | 635,353 |
| Australian Capitals | 0 | - | 4.92 | 62,593 |
| Word Chain - Australia | 0 | - | 4.37 | 38,014 |
| European Physical Geography | 0 | - | 4.26 | 33,374 |
| Word Scramble - European Cities | 0 | - | 3.81 | 18,793 |
| Albania Country Quiz | 0 | - | 4.54 | 38,658 |
| Russian History A-Z | 0 | - | 4.38 | 30,839 |
| Czech Republic Country Quiz | 0 | - | 4.52 | 41,864 |
| Slovakia... or Slovenia? | 0 | - | 4.69 | 41,777 |
| Ukraine Country Quiz | 0 | - | 4.42 | 47,319 |
| Hungary Country Quiz | 0 | - | 4.49 | 43,034 |
| Romania Country Quiz | 0 | - | 4.63 | 53,353 |
| Serbia Country Quiz | 0 | - | 4.44 | 34,770 |
| History of Austria | 0 | - | 4.70 | 17,748 |
| Geography of the French Empire | 0 | - | 4.48 | 26,934 |
| 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 | 433,572 |
| 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 | 117,608 |
| Languages of the United Kingdom | 0 | - | 4.13 | 40,703 |
| United Kingdom A-Z | 0 | - | 4.53 | 87,226 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,394 |
| Champions League Top 4 | 0 | - | 4.77 | 133,821 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,528 |
| Asia Map Quiz | 0 | - | 4.99 | 907,068 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,588,114 |
| Famous Duos #2 | 0 | - | 4.21 | 116,573 |
| Famous Duos Quiz #1 | 0 | - | 4.15 | 83,788 |
| Countries of Africa | 0 | - | 5.00 | 2,508,033 |
| Landlocked Countries in Africa | 0 | - | 4.99 | 45,821 |
| African East Coast | 0 | - | 4.96 | 95,057 |
| Western Africa Map Quiz | 0 | - | 4.97 | 72,928 |
| Oceania Geography Quiz | 0 | - | 4.55 | 21,980 |
| Oceanian Capitals - Map Quiz | 0 | - | 4.95 | 49,805 |
| Australia Map Quiz | 0 | - | 4.94 | 342,499 |
| Hispanic Last Names in the U.S. | 0 | - | 4.31 | 54,614 |
| South American Geography Quiz #2 | 0 | - | 4.62 | 39,198 |
| South American Geography Quiz #1 | 0 | - | 4.73 | 32,471 |
| Word Chain - South America | 0 | - | 4.51 | 23,765 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,966 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,219 |
| Mediterranean Countries Quiz | 0 | - | 4.99 | 210,156 |
| 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 | 362,312 |
| European Geography By Letter - E | 0 | - | 4.23 | 112,225 |
| 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 | 101,288 |
