| Countries of Europe Quiz | 0 | - | 5.00 | 3,780,027 |
| Countries of South America | 0 | - | 5.00 | 927,601 |
| Countries of Oceania | 0 | - | 5.00 | 1,057,293 |
| Countries of Asia Quiz | 0 | - | 5.00 | 1,877,878 |
| Landlocked Countries | 0 | - | 4.99 | 422,145 |
| Countries of the World Quiz | 0 | - | 5.00 | 47,596,415 |
| Sahara Desert Countries | 0 | - | 4.98 | 164,562 |
| Himalayan Countries | 0 | - | 4.94 | 138,823 |
| Andean Countries | 0 | - | 4.93 | 84,660 |
| Countries with the Youngest Median Age | 0 | - | 4.97 | 63,863 |
| Countries in the Southern Hemisphere | 0 | - | 4.99 | 125,900 |
| Coffee Producing Countries | 0 | - | 4.83 | 67,489 |
| Countries with Shrinking Populations | 0 | - | 4.94 | 65,838 |
| Danube Countries | 0 | - | 4.97 | 72,034 |
| Countries With an "Ish" Demonym | 0 | - | 4.98 | 117,041 |
| Countries With an "Ese" Demonym | 0 | - | 4.97 | 86,443 |
| Countries with the Worst Passports | 0 | - | 4.93 | 84,350 |
| Countries with the Most Immigrants | 0 | - | 4.90 | 149,832 |
| European Landlocked Countries | 0 | - | 4.99 | 147,165 |
| Partially Recognized Countries | 0 | - | 4.98 | 106,679 |
| Countries with the Most Species | 0 | - | 4.99 | 103,264 |
| Countries 197 to 205 | 0 | - | 4.90 | 70,792 |
| Tropic of Cancer Countries | 0 | - | 4.97 | 53,603 |
| Tropic of Capricorn Countries | 0 | - | 4.96 | 47,729 |
| Countries that Use the Peso | 0 | - | 4.89 | 59,554 |
| Countries with the Largest Exclusive Economic Zone | 0 | - | 4.90 | 73,246 |
| Countries with a AAA Credit Rating | 0 | - | 4.86 | 57,684 |
| Countries in the Alps | 0 | - | 4.87 | 118,234 |
| Top Five Importing Partners by Country | 0 | - | 4.97 | 101,218 |
| Countries, Capitals, Currencies and Official Languages | 0 | - | 5.00 | 107,064 |
| Biggest Import Partners By Country | 0 | - | 4.99 | 78,672 |
| Southernmost Countries by Continent | 0 | - | 4.98 | 96,615 |
| Northernmost Countries by Continent | 0 | - | 4.98 | 116,537 |
| Countries by Population Growth, 1970–Present | 0 | - | 4.92 | 95,960 |
| Five Biggest Countries by Latitude | 0 | - | 4.97 | 100,695 |
| Five Biggest Countries by Longitude | 0 | - | 4.91 | 53,513 |
| Largest Country by Body of Water | 0 | - | 4.96 | 58,192 |
| Countries with the Most Container Port Traffic | 0 | - | 4.92 | 62,867 |
| Bridge and Tunnel Borders | 0 | - | 4.96 | 53,666 |
| Countries with the Longest Road Networks Quiz | 0 | - | 4.90 | 41,536 |
| Countries that Touch the Prime Meridian or Equator | 0 | - | 4.88 | 104,242 |
| Arctic Ocean Countries | 0 | - | 4.95 | 79,493 |
| Countries with the Most Grassland | 0 | - | 4.94 | 77,544 |
| All Countries by Area : Four at a Time | 0 | - | 5.00 | 118,951 |
| Countries with the Most Climate Zones | 0 | - | 4.96 | 68,331 |
| Countries that Host the Most Refugees | 0 | - | 4.96 | 63,998 |
| Countries of the World by Similar Area in 90 Seconds | 0 | - | 4.95 | 46,116 |
| All Countries of the World by Area with Hints | 0 | - | 4.97 | 244,035 |
| World Countries - Blind Typing | 0 | - | 5.00 | 108,178 |
| Countries in Their Own Alphabet | 0 | - | 4.95 | 48,249 |
| Largest Countries By Category | 0 | - | 4.97 | 158,248 |
| Countries by Countries | 0 | - | 4.96 | 63,251 |
| Country Flags with the Most White | 0 | - | 4.85 | 138,711 |
| Countries With the Northernmost Southernmost Point | 0 | - | 4.96 | 62,297 |
| Countries with the Southernmost Northernmost Point | 0 | - | 4.87 | 47,571 |
| Country Flags With Only Two Colors | 0 | - | 4.91 | 88,690 |
| Top 50 Countries by Population - In Order | 0 | - | 4.98 | 331,712 |
| Spanish-Speaking Countries | 0 | - | 4.95 | 375,552 |
| Countries with the Most Tourists Quiz | 0 | - | 4.92 | 407,428 |
| Island Countries | 0 | - | 4.99 | 711,108 |
| Biggest Countries by Area | 0 | - | 5.00 | 1,050,099 |
| Northernmost Countries | 0 | - | 4.99 | 362,037 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,025,868 |
| "Land" Countries | 0 | - | 4.98 | 337,393 |
| Countries of the World with an Empty Map | 0 | - | 5.00 | 3,384,117 |
| Countries More Populous Than Their Neighbors | 0 | - | 4.99 | 173,937 |
| Countries with Megacities | 0 | - | 4.99 | 264,654 |
| Countries With More than 50 Million People | 0 | - | 4.99 | 199,773 |
| Countries with the Most Population Growth by Decade | 0 | - | 4.98 | 113,494 |
| Countries With More than 200 Million People | 0 | - | 4.95 | 138,036 |
| Countries Less Populous Than Their Neighbors | 0 | - | 4.96 | 81,565 |
| Countries by Official Language | 0 | - | 4.95 | 195,286 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.91 | 296,418 |
| Countries in their Native Language | 0 | - | 4.99 | 199,077 |
| Independence from Whom | 0 | - | 4.99 | 212,146 |
| Subdivisions by Country | 0 | - | 4.86 | 50,437 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,761 |
| Megadiverse Countries | 0 | - | 4.96 | 135,026 |
| Countries With the Most English Speakers | 0 | - | 4.86 | 132,122 |
| Countries Producing the Most Sugarcane | 0 | - | 4.95 | 55,368 |
| Countries with Multiple Big Islands | 0 | - | 4.93 | 126,245 |
| Top 10 Wheat-Producing Countries | 0 | - | 4.89 | 75,112 |
| 15 Biggest Island Countries | 0 | - | 4.98 | 163,160 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,605 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,497 |
| Countries Bigger Than Their Neighbors | 0 | - | 4.93 | 154,044 |
| Countries with Multiple Populous Islands | 0 | - | 4.89 | 95,669 |
| Countries in Relation to Cities #1 | 0 | - | 4.92 | 45,151 |
| Countries by Sports League Revenue | 0 | - | 4.94 | 77,700 |
| Landmarks of Countries #1 | 0 | - | 4.88 | 107,894 |
| Countries Furthest from the United States | 0 | - | 4.94 | 89,217 |
| Countries with the Highest HDI | 0 | - | 4.95 | 136,973 |
| Straight Shot to the Arctic Circle | 0 | - | 4.88 | 75,362 |
| Most Dispersed Island Nations | 0 | - | 4.97 | 71,502 |
| Countries of the World in Alphabetical Order | 0 | - | 5.00 | 111,236 |
| World Map Quiz | 0 | - | 4.81 | 65,117 |
| Recognized, Non-Recognized Countries, and Territories of the World | 0 | - | 5.00 | 157,372 |
| Smallest Countries with at Least One Border | 0 | - | 4.87 | 107,367 |
| Countries by Founding Story | 0 | - | 4.95 | 77,387 |
| Countries by Road Signs | 0 | - | 4.98 | 54,026 |
| Southernmost Countries of the World | 0 | - | 4.99 | 228,122 |
| Countries by Inland Surface Water | 0 | - | 4.93 | 105,296 |
| Top 20 Motor Vehicle Producing Countries | 0 | - | 4.91 | 123,016 |
| Countries With the Most Languages | 0 | - | 4.90 | 202,247 |
| Countries with the Highest Population Under Age 15 | 0 | - | 4.95 | 110,914 |
| Countries with the Highest Population 65 and Older | 0 | - | 4.90 | 94,028 |
| Countries with the Most Prisoners | 0 | - | 4.94 | 99,313 |
| Countries with the Most Domestic Camels | 0 | - | 4.94 | 61,450 |
| Tallest Countries North to South | 0 | - | 4.83 | 120,587 |
| Widest Countries East to West | 0 | - | 4.92 | 129,666 |
| Countries with the Highest Average Elevation | 0 | - | 4.98 | 71,462 |
| Largest Countries by Area or Population | 0 | - | 5.00 | 186,396 |
| Countries with the Most Area in the Southern Hemisphere | 0 | - | 4.99 | 98,126 |
| Most Populous Countries as a Percent of Their Continent | 0 | - | 4.97 | 94,779 |
| Largest Countries as a Percent of Continent | 0 | - | 4.97 | 148,612 |
| Countries with the Most Desert | 0 | - | 4.93 | 127,883 |
| Countries by Contribution to UN Budget | 0 | - | 4.87 | 77,378 |
| Countries with Most Nobel Laureates per Capita | 0 | - | 4.83 | 34,801 |
| Countries with Double Letters | 0 | - | 4.96 | 96,256 |
| Countries that End in N | 0 | - | 4.95 | 171,148 |
| Countries with Five Letters | 0 | - | 4.96 | 282,526 |
| Countries with Six Letters | 0 | - | 4.94 | 213,581 |
| Countries with W | 0 | - | 4.97 | 160,336 |
| Countries with Z | 0 | - | 4.98 | 291,487 |
| Countries with Letters Missing | 0 | - | 4.96 | 186,719 |
| Countries That End in U | 0 | - | 4.95 | 120,861 |
| Top 20 Longest One-Word Country Names | 0 | - | 4.98 | 134,476 |
| Countries that End in O | 0 | - | 4.92 | 159,512 |
| Countries that End in R | 0 | - | 4.87 | 118,973 |
| Country Names Created by Only 4 Letters | 0 | - | 4.99 | 155,734 |
| Countries Ending in "IA" | 0 | - | 4.99 | 209,118 |
| Countries by First and Last Letter #1 | 0 | - | 4.97 | 170,704 |
| Countries by Last Two Letters | 0 | - | 4.85 | 135,481 |
| Countries by First and Last Letter #2 | 0 | - | 4.96 | 142,407 |
| Countries That End in Y | 0 | - | 4.91 | 185,879 |
| Countries Based on First Two Letters #1 | 0 | - | 4.99 | 197,932 |
| Countries with Cardinal Directions in Their Names | 0 | - | 4.92 | 152,865 |
| Countries that End in I | 0 | - | 4.94 | 135,098 |
| Countries Based on First Two Letters #2 | 0 | - | 4.99 | 184,121 |
| Countries by Initial Letter and Length #1 | 0 | - | 4.98 | 95,826 |
| Countries That End in NIA | 0 | - | 4.92 | 109,790 |
| Countries That End in BIA | 0 | - | 4.93 | 149,222 |
| Countries by Initial Letter and Continent #1 | 0 | - | 4.94 | 167,131 |
| Countries Whose Names Start with Saint | 0 | - | 4.87 | 119,435 |
| Countries That End in RIA | 0 | - | 4.93 | 126,810 |
| Most Common Words in Official Country Names | 0 | - | 4.86 | 111,026 |
| Divided Country Name Puzzle #1 | 0 | - | 4.99 | 227,641 |
| Divided Country Name Puzzle #2 | 0 | - | 4.99 | 133,719 |
| Divided Country Name Puzzle #3 | 0 | - | 4.92 | 126,136 |
| Groups of Countries that Start with the Same 3 Letters | 0 | - | 5.00 | 91,693 |
| Add A Letter - Make a Country | 0 | - | 4.82 | 74,581 |
| Countries With One Word and Three A's | 0 | - | 4.92 | 53,034 |
| Countries with a Unique Last Letter | 0 | - | 4.90 | 103,447 |
| Unique Starting Letter - Countries by Continent | 0 | - | 4.98 | 125,530 |
| Countries that are Free from U.S.A. | 0 | - | 4.89 | 49,423 |
| Countries with the Word "And" | 0 | - | 4.99 | 117,298 |
| Countries Containing Two or More Words | 0 | - | 4.97 | 53,989 |
| Countries that End in L | 0 | - | 4.94 | 156,846 |
| "Stan" Countries Quiz | 0 | - | 4.97 | 215,825 |
| Countries Ending with "An", but not "Stan" | 0 | - | 4.98 | 85,268 |
| City to Country Quiz #1 | 0 | - | 4.97 | 156,032 |
| City to Country Quiz #3 | 0 | - | 4.88 | 118,960 |
| 45 European Countries, 45 Cities | 0 | - | 4.95 | 79,003 |
| Five Biggest Countries by Continent | 0 | - | 4.99 | 249,762 |
| Five Poorest Countries by Continent | 0 | - | 4.93 | 200,668 |
| Five Least Populated Countries by Continent | 0 | - | 4.95 | 142,999 |
| Five Smallest Countries by Continent | 0 | - | 4.98 | 163,551 |
| First Five Countries Alphabetically by Continent | 0 | - | 4.94 | 225,455 |
| Last Five Countries Alphabetically by Continent | 0 | - | 4.98 | 152,869 |
| Five Northernmost Capital Cities by Continent | 0 | - | 4.89 | 71,105 |
| Top 10 Countries in Nuclear Power Production | 0 | - | 4.95 | 86,709 |
| 10 Northernmost Countries That Start with S | 0 | - | 4.94 | 62,875 |
| Biggest Countries by Population | 0 | - | 5.00 | 1,448,449 |
| Smallest Countries by Population and Area | 0 | - | 4.99 | 381,034 |
| One Border Countries | 0 | - | 4.98 | 469,961 |
| Countries by Borders in 90 Seconds | 0 | - | 4.99 | 3,835,365 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,633,044 |
| Five Most Densely Populated Countries by Continent | 0 | - | 4.96 | 86,952 |
| Five Most Populated Countries by Continent | 0 | - | 4.99 | 268,226 |
| Most Populous Countries with Exceptions | 0 | - | 4.98 | 122,169 |
| Top 10 Most Densely-Populated Countries in Europe | 0 | - | 4.98 | 112,579 |
| Five Least Densely Populated Countries by Continent | 0 | - | 4.92 | 93,753 |
| Countries by Population Range - Tile Select | 0 | - | 4.87 | 59,235 |
| Countries by National Anthem | 0 | - | 4.93 | 71,294 |
| NATO Countries | 0 | - | 4.98 | 281,592 |
| EU Countries Quiz | 0 | - | 4.99 | 275,597 |
| Recently Independent Countries | 0 | - | 4.98 | 159,490 |
| French-Speaking Countries | 0 | - | 4.85 | 270,884 |
| Natural Features of Countries #1 | 0 | - | 4.87 | 83,902 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,580 |
| Countries with the Most Military Troops | 0 | - | 4.95 | 289,382 |
| Countries with Nuclear Weapons | 0 | - | 4.86 | 274,545 |
| German-Speaking Countries | 0 | - | 4.91 | 145,756 |
| Countries with Wild Tigers | 0 | - | 4.96 | 136,977 |
| Countries with Wild Penguins | 0 | - | 4.94 | 100,295 |
| Solve the Secret Country #1 | 0 | - | 4.94 | 166,384 |
| Top Five Countries by Religion | 0 | - | 4.93 | 172,258 |
| Solve the Secret Country #2 | 0 | - | 4.87 | 118,941 |
| Countries by Hottest Recorded Temperature | 0 | - | 4.92 | 113,275 |
| Countries by Coldest Recorded Temperature | 0 | - | 4.83 | 112,578 |
