| Warsaw Pact Countries | 0 | - | 4.83 | 80,971 |
| Recently Independent Countries Quiz | 0 | - | 4.98 | 146,642 |
| Independence from Whom | 0 | - | 4.99 | 189,696 |
| Who Controlled These Colonies? | 0 | - | 4.89 | 115,868 |
| Most Recently-Settled Countries | 0 | - | 4.92 | 49,969 |
| Countries of the World in 1938 Quiz | 0 | - | 4.96 | 79,804 |
| Countries of the World Quiz | 0 | - | 5.00 | 41,844,773 |
| Countries of the World in 1900 | 0 | - | 4.88 | 68,708 |
| Countries of the World in 1914 with a Map | 0 | - | 4.99 | 173,927 |
| Countries of the World in 1945 with a Map | 0 | - | 5.00 | 131,063 |
| Countries by Former Name | 0 | - | 4.99 | 115,715 |
| Historical City to Country | 0 | - | 4.82 | 73,158 |
| Landlocked Countries Quiz | 0 | - | 4.99 | 335,379 |
| Most Populous Countries by Year | 0 | - | 4.81 | 95,987 |
| First Countries to Reach 5 Million People | 0 | - | 4.90 | 111,056 |
| Most Populous Modern-Day Countries in 1000 AD | 0 | - | 4.85 | 69,432 |
| Most Populous Modern-Day Countries in 1 AD | 0 | - | 4.97 | 77,094 |
| Most Populous Modern-Day Countries in 1800 AD | 0 | - | 4.92 | 54,313 |
| Most Populous Modern-Day Countries in 1500 AD | 0 | - | 4.93 | 67,710 |
| Most Populous Modern-Day Countries by Century | 0 | - | 4.98 | 88,290 |
| Former Capitals Quiz | 0 | - | 4.82 | 58,716 |
| Countries Settled by Vikings | 0 | - | 4.93 | 113,140 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,182,808 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.92 | 52,061 |
| Countries of Europe in 1444 | 0 | - | 4.93 | 88,847 |
| Countries of Europe Quiz | 0 | - | 5.00 | 3,236,242 |
| Members of the Arab League | 0 | - | 4.86 | 66,653 |
| Sahara Desert Countries | 0 | - | 4.97 | 130,794 |
| Himalayan Countries | 0 | - | 4.94 | 108,732 |
| Andean Countries | 0 | - | 4.91 | 60,399 |
| Countries with the Oldest Median Age | 0 | - | 4.82 | 61,593 |
| Countries with the Youngest Median Age | 0 | - | 4.98 | 50,996 |
| Countries in the Southern Hemisphere | 0 | - | 4.99 | 104,629 |
| Coffee Producing Countries | 0 | - | 4.82 | 54,930 |
| Countries with Shrinking Populations | 0 | - | 4.93 | 54,374 |
| Danube Countries | 0 | - | 4.96 | 57,294 |
| Countries With an "Ish" Demonym | 0 | - | 4.97 | 92,289 |
| Countries With an "Ese" Demonym | 0 | - | 4.96 | 65,348 |
| Countries with the Best Passports | 0 | - | 4.86 | 72,851 |
| Countries with the Worst Passports | 0 | - | 4.89 | 50,528 |
| Countries with the Most Immigrants | 0 | - | 4.87 | 111,189 |
| European Landlocked Countries | 0 | - | 4.99 | 137,295 |
| Partially Recognized Countries | 0 | - | 4.98 | 90,945 |
| Countries with the Most Species | 0 | - | 4.99 | 90,095 |
| Countries 197 to 205 | 0 | - | 4.87 | 57,472 |
| Tropic of Cancer Countries | 0 | - | 4.96 | 45,066 |
| Tropic of Capricorn Countries | 0 | - | 4.96 | 44,359 |
| Countries Producing the Most Sugarcane | 0 | - | 4.94 | 49,151 |
| Countries that Use the Peso | 0 | - | 4.82 | 46,942 |
| Countries with the Largest Exclusive Economic Zone | 0 | - | 4.88 | 59,172 |
| Countries with a AAA Credit Rating | 0 | - | 4.87 | 50,009 |
| Countries in the Alps | 0 | - | 4.84 | 103,996 |
| Top Five Importing Partners by Country | 0 | - | 4.98 | 86,569 |
| Countries, Capitals, Currencies and Official Languages | 0 | - | 5.00 | 89,816 |
| Biggest Import Partners By Country | 0 | - | 4.99 | 72,376 |
| Southernmost Countries by Continent | 0 | - | 4.98 | 79,484 |
| Northernmost Countries by Continent | 0 | - | 4.97 | 95,003 |
| Countries by Population Growth, 1970–Present | 0 | - | 4.91 | 88,434 |
| Five Biggest Countries by Latitude | 0 | - | 4.97 | 90,657 |
| Five Biggest Countries by Longitude | 0 | - | 4.91 | 46,837 |
| Biggest Country by Body of Water | 0 | - | 4.96 | 45,753 |
| Countries with the Most Container Port Traffic | 0 | - | 4.92 | 55,495 |
| Top 10 Wheat-Producing Countries | 0 | - | 4.88 | 70,256 |
| Bridge and Tunnel Borders | 0 | - | 4.96 | 49,082 |
| Countries with the Longest Road Networks Quiz | 0 | - | 4.90 | 37,070 |
| Countries that Touch the Prime Meridian or Equator | 0 | - | 4.88 | 96,674 |
| Arctic Ocean Countries | 0 | - | 4.93 | 72,760 |
| Countries with the Most Grassland | 0 | - | 4.94 | 70,338 |
| All Countries by Area : Four at a Time | 0 | - | 5.00 | 100,850 |
| Countries with the Most Climate Zones | 0 | - | 4.96 | 62,035 |
| Countries that Host the Most Refugees | 0 | - | 4.94 | 54,126 |
| All Countries of the World by Area with Hints | 0 | - | 4.97 | 203,336 |
| World Countries - Blind Typing | 0 | - | 5.00 | 75,719 |
| Countries in Their Own Alphabet | 0 | - | 4.95 | 42,902 |
| Largest Countries By Category | 0 | - | 4.97 | 146,591 |
| Countries by Countries | 0 | - | 4.95 | 55,711 |
| Country Flags with the Most White | 0 | - | 4.91 | 126,706 |
| Countries With the Northernmost Southernmost Point | 0 | - | 4.96 | 59,266 |
| Countries with the Southernmost Northernmost Point | 0 | - | 4.87 | 45,185 |
| Country Flags With Only Two Colors | 0 | - | 4.92 | 79,782 |
| Spanish-Speaking Countries | 0 | - | 4.94 | 345,543 |
| Countries with the Most Tourists Quiz | 0 | - | 4.91 | 363,379 |
| Island Countries Quiz | 0 | - | 4.99 | 669,470 |
| Biggest Countries by Area | 0 | - | 5.00 | 949,013 |
| Northernmost Countries | 0 | - | 4.99 | 331,217 |
| Countries of South America | 0 | - | 5.00 | 811,662 |
| Countries of Oceania | 0 | - | 5.00 | 915,620 |
| Countries of Asia Quiz | 0 | - | 5.00 | 1,615,190 |
| Most Populous Countries in 1900 | 0 | - | 4.92 | 163,678 |
| Flags of Countries of the World in 1910 | 0 | - | 4.95 | 70,314 |
| Battle to Country | 0 | - | 4.92 | 36,887 |
| Countries by Independence Day | 0 | - | 4.63 | 44,764 |
| Former Countries by Capital | 0 | - | 4.44 | 105,245 |
| Former Countries | 0 | - | 4.72 | 126,122 |
| Guerrillas by Country | 0 | - | 4.45 | 38,952 |
| Countries More Populous Than Their Neighbors | 0 | - | 4.99 | 129,331 |
| Countries with Megacities | 0 | - | 4.99 | 202,224 |
| Most Populous Countries in 1950 | 0 | - | 4.50 | 71,453 |
| Countries With More than 50 Million People | 0 | - | 4.99 | 175,696 |
| Countries with the Most Population Growth by Decade | 0 | - | 4.97 | 100,128 |
| Countries With More than 200 Million People | 0 | - | 4.94 | 98,488 |
| Countries Less Populous Than Their Neighbors | 0 | - | 4.97 | 66,078 |
| Top 50 Countries by Population - In Order | 0 | - | 4.97 | 253,565 |
| Countries by Official Language | 0 | - | 4.96 | 175,467 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.92 | 253,904 |
| Countries in their Native Language | 0 | - | 4.98 | 180,823 |
| Subdivisions by Country | 0 | - | 4.85 | 46,945 |
| Megadiverse Countries | 0 | - | 4.96 | 126,900 |
| Countries With the Most English Speakers | 0 | - | 4.87 | 94,133 |
| Countries with Multiple Big Islands | 0 | - | 4.93 | 107,684 |
| Most Desired Destinations for Potential Migrants | 0 | - | 4.82 | 47,869 |
| 15 Biggest Island Countries | 0 | - | 4.99 | 133,501 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 95,632 |
| Countries Bigger Than Their Neighbors | 0 | - | 4.95 | 146,109 |
| Countries with Multiple Populous Islands | 0 | - | 4.91 | 77,782 |
| Countries in Relation to Cities #1 | 0 | - | 4.92 | 41,885 |
| Countries by Sports League Revenue | 0 | - | 4.89 | 45,229 |
| Landmarks of Countries #1 | 0 | - | 4.89 | 102,337 |
| Countries Furthest from the United States | 0 | - | 4.94 | 73,031 |
| Countries with the Highest HDI | 0 | - | 4.95 | 131,573 |
| Straight Shot to the Arctic Circle | 0 | - | 4.92 | 69,469 |
| Most Dispersed Island Nations | 0 | - | 4.96 | 66,095 |
| Countries of the World in Alphabetical Order | 0 | - | 5.00 | 86,969 |
| World Map Quiz | 0 | - | 4.90 | 51,658 |
| Recognized, Non-Recognized Countries, and Territories of the World | 0 | - | 5.00 | 119,030 |
| Smallest Countries with at Least One Border | 0 | - | 4.90 | 82,844 |
| Southernmost Countries of the World | 0 | - | 4.99 | 209,996 |
| Countries by Inland Surface Water | 0 | - | 4.94 | 92,972 |
| Top 20 Motor Vehicle Producing Countries | 0 | - | 4.91 | 110,351 |
| Countries With the Most Languages | 0 | - | 4.90 | 178,110 |
| Countries with the Highest Population Under Age 15 | 0 | - | 4.93 | 88,791 |
| Countries with the Highest Population 65 and Older | 0 | - | 4.86 | 73,205 |
| Countries with the Most Prisoners | 0 | - | 4.94 | 88,437 |
| Countries with the Most Domestic Camels | 0 | - | 4.92 | 55,195 |
| Tallest Countries North to South | 0 | - | 4.85 | 111,698 |
| Widest Countries East to West | 0 | - | 4.93 | 120,663 |
| Countries with the Highest Average Elevation | 0 | - | 4.98 | 69,150 |
| Largest Countries by Area or Population | 0 | - | 5.00 | 160,713 |
| Countries with the Longest Perimeter | 0 | - | 4.81 | 72,914 |
| Countries with the Most Area in the Southern Hemisphere | 0 | - | 4.99 | 93,474 |
| Most Populous Countries as a Percent of Their Continent | 0 | - | 4.97 | 86,958 |
| Largest Countries as a Percent of Continent | 0 | - | 4.97 | 120,767 |
| Countries with the Most Desert | 0 | - | 4.92 | 106,608 |
| Countries by Contribution to UN Budget | 0 | - | 4.87 | 66,828 |
| Countries with Most Nobel Laureates per Capita | 0 | - | 4.83 | 32,448 |
| Countries with Double Letters | 0 | - | 4.96 | 72,552 |
| Countries that End in N | 0 | - | 4.94 | 136,787 |
| Countries with Five Letters Quiz | 0 | - | 4.97 | 234,577 |
| Countries with Six Letters Quiz | 0 | - | 4.95 | 191,130 |
| Countries with W | 0 | - | 4.96 | 126,232 |
| Countries with Z | 0 | - | 4.98 | 265,267 |
| Countries with Letters Missing | 0 | - | 4.97 | 170,090 |
| Countries That End in U | 0 | - | 4.95 | 109,806 |
| Top 20 Longest One-Word Country Names | 0 | - | 4.97 | 92,898 |
| Countries that End in O | 0 | - | 4.92 | 148,933 |
| Countries that End in R | 0 | - | 4.85 | 97,505 |
| Country Names Created by Only 4 Letters | 0 | - | 4.99 | 148,445 |
| Countries Ending in "IA" | 0 | - | 4.99 | 174,530 |
| Countries by First and Last Letter #1 | 0 | - | 4.98 | 157,921 |
| Countries by Last Two Letters | 0 | - | 4.89 | 117,851 |
| Countries by First and Last Letter #2 | 0 | - | 4.95 | 130,789 |
| Countries That End in Y | 0 | - | 4.92 | 177,530 |
| Countries Based on First Two Letters #1 | 0 | - | 4.99 | 163,189 |
| Countries with Cardinal Directions in Their Names | 0 | - | 4.91 | 122,755 |
| Countries that End in I | 0 | - | 4.92 | 115,313 |
| Countries Based on First Two Letters #2 | 0 | - | 4.98 | 151,817 |
| Countries by Initial Letter and Length #1 | 0 | - | 4.98 | 89,494 |
| Countries That End in NIA | 0 | - | 4.92 | 101,929 |
| Countries That End in BIA | 0 | - | 4.91 | 127,460 |
| Countries by Initial Letter and Continent #1 | 0 | - | 4.94 | 155,333 |
| Countries Whose Names Start with Saint | 0 | - | 4.87 | 111,093 |
| Countries That End in RIA | 0 | - | 4.90 | 102,006 |
| Most Common Words in Official Country Names | 0 | - | 4.86 | 101,913 |
| Divided Country Name Puzzle #1 | 0 | - | 4.99 | 205,146 |
| Divided Country Name Puzzle #2 | 0 | - | 4.99 | 121,880 |
| Divided Country Name Puzzle #3 | 0 | - | 4.92 | 113,025 |
| Groups of Countries that Start with the Same 3 Letters | 0 | - | 4.99 | 79,523 |
| Countries With One Word and Three A's | 0 | - | 4.92 | 41,433 |
| Countries with a Unique Last Letter | 0 | - | 4.91 | 93,956 |
| Unique Starting Letter - Countries by Continent | 0 | - | 4.98 | 98,306 |
| Countries that are Free from U.S.A. | 0 | - | 4.90 | 43,789 |
| Countries with the Word "And" | 0 | - | 4.98 | 85,224 |
| Countries Containing Two or More Words | 0 | - | 4.97 | 42,669 |
| Countries that End in L | 0 | - | 4.95 | 136,002 |
| "Land" Countries | 0 | - | 4.98 | 292,574 |
| "Stan" Countries Quiz | 0 | - | 4.97 | 191,443 |
| Countries Ending with "An", but not "Stan" | 0 | - | 4.98 | 82,943 |
| City to Country Quiz #1 | 0 | - | 4.95 | 135,469 |
| City to Country Quiz #3 | 0 | - | 4.87 | 101,146 |
| 45 European Countries, 45 Cities | 0 | - | 4.95 | 72,727 |
| Five Biggest Countries by Continent | 0 | - | 4.99 | 211,337 |
| Five Poorest Countries by Continent | 0 | - | 4.94 | 171,197 |
| Five Least Populated Countries by Continent | 0 | - | 4.96 | 117,947 |
| Five Smallest Countries by Continent | 0 | - | 4.97 | 135,058 |
| First Five Countries Alphabetically by Continent | 0 | - | 4.93 | 196,625 |
| Last Five Countries Alphabetically by Continent | 0 | - | 4.98 | 142,699 |
| Five Northernmost Capital Cities by Continent | 0 | - | 4.89 | 66,671 |
| Top 15 Countries that Produce the Most Tea | 0 | - | 4.84 | 103,403 |
| Top 10 Countries in Nuclear Power Production | 0 | - | 4.95 | 83,345 |
| 10 Northernmost Countries That Start with S | 0 | - | 4.93 | 57,463 |
