| Countries of the World in 1900 | 0 | - | 4.89 | 85,598 |
| Countries of the World in 1914 with a Map | 0 | - | 4.99 | 196,257 |
| Countries of the World in 1945 with a Map | 0 | - | 5.00 | 151,740 |
| Countries of Europe in 1444 | 0 | - | 4.92 | 100,319 |
| Countries of the World in 1444 | 0 | - | 4.98 | 60,594 |
| Modern-Day Countries of the Inca Empire on a Map | 0 | - | 4.83 | 57,741 |
| Independence from Whom | 0 | - | 4.99 | 212,577 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 133,079 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,702 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,752 |
| Countries by Founding Story | 0 | - | 4.95 | 77,544 |
| Modern-Day Countries of the Umayyad Caliphate on a Map | 0 | - | 4.98 | 69,066 |
| Countries by Borders in 90 Seconds | 0 | - | 4.99 | 3,842,217 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,643,343 |
| Recently Independent Countries | 0 | - | 4.98 | 159,714 |
| Countries by Former Name | 0 | - | 4.99 | 125,571 |
| Historical City to Country | 0 | - | 4.85 | 78,763 |
| Countries of the World Quiz | 0 | - | 5.00 | 47,736,766 |
| Landlocked Countries | 0 | - | 4.99 | 423,867 |
| Save Humanity by Guessing Countries | 0 | - | 4.98 | 583,571 |
| Countries of Europe in 1000 with a Map | 0 | - | 4.78 | 43,498 |
| Countries of Europe Quiz | 0 | - | 5.00 | 3,792,449 |
| Most Populous Countries by Year | 0 | - | 4.83 | 111,132 |
| First Countries to Reach 5 Million People | 0 | - | 4.93 | 135,709 |
| Most Populous Modern-Day Countries in 1000 AD | 0 | - | 4.88 | 76,398 |
| Most Populous Modern-Day Countries in 1 AD | 0 | - | 4.98 | 93,075 |
| Most Populous Modern-Day Countries in 1800 AD | 0 | - | 4.93 | 67,424 |
| Most Populous Modern-Day Countries in 1500 AD | 0 | - | 4.93 | 73,737 |
| Most Populous Modern-Day Countries by Century | 0 | - | 4.98 | 97,588 |
| Sahara Desert Countries | 0 | - | 4.98 | 165,370 |
| Himalayan Countries | 0 | - | 4.94 | 139,546 |
| Andean Countries | 0 | - | 4.94 | 85,070 |
| Countries with the Youngest Median Age | 0 | - | 4.97 | 64,252 |
| Countries in the Southern Hemisphere | 0 | - | 4.99 | 126,469 |
| Coffee Producing Countries | 0 | - | 4.83 | 67,814 |
| Countries with Shrinking Populations | 0 | - | 4.94 | 66,125 |
| Danube Countries | 0 | - | 4.97 | 72,215 |
| Countries With an "Ish" Demonym | 0 | - | 4.98 | 117,313 |
| Countries With an "Ese" Demonym | 0 | - | 4.97 | 86,630 |
| Countries with the Worst Passports | 0 | - | 4.93 | 84,717 |
| Countries with the Most Immigrants | 0 | - | 4.90 | 150,225 |
| European Landlocked Countries | 0 | - | 4.99 | 147,387 |
| Partially Recognized Countries | 0 | - | 4.98 | 106,988 |
| Countries with the Most Species | 0 | - | 4.99 | 103,425 |
| Countries 197 to 205 | 0 | - | 4.90 | 71,116 |
| Countries Settled by Vikings | 0 | - | 4.93 | 121,916 |
| Tropic of Cancer Countries | 0 | - | 4.97 | 53,682 |
| Tropic of Capricorn Countries | 0 | - | 4.96 | 47,794 |
| Countries that Use the Peso | 0 | - | 4.89 | 59,704 |
| Countries with the Largest Exclusive Economic Zone | 0 | - | 4.90 | 73,441 |
| Countries with a AAA Credit Rating | 0 | - | 4.86 | 57,854 |
| Countries in the Alps | 0 | - | 4.87 | 118,499 |
| Top Five Importing Partners by Country | 0 | - | 4.97 | 102,091 |
| Countries, Capitals, Currencies and Official Languages | 0 | - | 5.00 | 107,463 |
| Biggest Import Partners By Country | 0 | - | 4.99 | 78,814 |
| Southernmost Countries by Continent | 0 | - | 4.98 | 96,816 |
| Northernmost Countries by Continent | 0 | - | 4.98 | 116,750 |
| Countries by Population Growth, 1970–Present | 0 | - | 4.92 | 96,098 |
| Five Biggest Countries by Latitude | 0 | - | 4.97 | 100,925 |
| Five Biggest Countries by Longitude | 0 | - | 4.91 | 53,675 |
| Largest Country by Body of Water | 0 | - | 4.96 | 58,302 |
| Countries with the Most Container Port Traffic | 0 | - | 4.92 | 63,020 |
| Bridge and Tunnel Borders | 0 | - | 4.96 | 53,764 |
| Countries with the Longest Road Networks Quiz | 0 | - | 4.90 | 41,632 |
| Countries that Touch the Prime Meridian or Equator | 0 | - | 4.88 | 104,392 |
| Arctic Ocean Countries | 0 | - | 4.95 | 79,640 |
| Countries with the Most Grassland | 0 | - | 4.94 | 77,726 |
| All Countries by Area : Four at a Time | 0 | - | 5.00 | 119,385 |
| Countries with the Most Climate Zones | 0 | - | 4.96 | 68,476 |
| Countries that Host the Most Refugees | 0 | - | 4.97 | 65,265 |
| Countries of the World by Similar Area in 90 Seconds | 0 | - | 4.95 | 46,367 |
| All Countries of the World by Area with Hints | 0 | - | 4.97 | 244,939 |
| World Countries - Blind Typing | 0 | - | 5.00 | 108,671 |
| Countries in Their Own Alphabet | 0 | - | 4.95 | 48,384 |
| Largest Countries By Category | 0 | - | 4.97 | 158,553 |
| Countries by Countries | 0 | - | 4.96 | 63,444 |
| Pixelated World Map | 0 | - | 5.00 | 143,877 |
| Country Flags with the Most White | 0 | - | 4.85 | 139,018 |
| Warsaw Pact Countries | 0 | - | 4.83 | 84,620 |
| Countries With the Northernmost Southernmost Point | 0 | - | 4.96 | 62,350 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,040 |
| Countries with the Southernmost Northernmost Point | 0 | - | 4.87 | 47,624 |
| All Countries by Population With a Map | 0 | - | 4.99 | 110,296 |
| Six Degrees of Separation - Countries #1 | 0 | - | 4.96 | 99,212 |
| Country Flags With Only Two Colors | 0 | - | 4.91 | 88,909 |
| Countries of the World with a Borderless Map | 0 | - | 4.99 | 82,587 |
| Top 50 Countries by Population - In Order | 0 | - | 4.98 | 333,293 |
| Spanish-Speaking Countries | 0 | - | 4.95 | 376,122 |
| Countries with the Most Tourists Quiz | 0 | - | 4.92 | 408,597 |
| Island Countries | 0 | - | 4.99 | 711,789 |
| Modern-Day Countries of the Khmer Empire on a Map | 0 | - | 4.77 | 45,735 |
| Modern-Day Countries of the Mayan Civilization | 0 | - | 4.78 | 33,586 |
| Biggest Countries by Area | 0 | - | 5.00 | 1,052,516 |
| Northernmost Countries | 0 | - | 4.99 | 363,102 |
| Countries of South America | 0 | - | 5.00 | 930,013 |
| Countries of Oceania | 0 | - | 5.00 | 1,060,349 |
| Countries of Asia Quiz | 0 | - | 5.00 | 1,883,533 |
| "Land" Countries | 0 | - | 4.98 | 337,896 |
| Most Populous Countries in 1900 | 0 | - | 4.91 | 174,081 |
| Countries by Independence Day | 0 | - | 4.62 | 52,831 |
| Former Countries by Capital | 0 | - | 4.45 | 127,714 |
| Former Countries | 0 | - | 4.77 | 134,074 |
| Countries of the World with an Empty Map | 0 | - | 5.00 | 3,388,637 |
| Mediterranean Countries with an Empty Map | 0 | - | 4.99 | 105,358 |
| Flags of Countries of the World in 1910 | 0 | - | 4.96 | 79,311 |
| Battle to Country | 0 | - | 4.91 | 53,736 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,046 |
| Countries More Populous Than Their Neighbors | 0 | - | 4.99 | 174,453 |
| Countries with Megacities | 0 | - | 4.99 | 265,896 |
| Countries With More than 50 Million People | 0 | - | 4.99 | 200,249 |
| Countries with the Most Population Growth by Decade | 0 | - | 4.98 | 113,756 |
| Countries With More than 200 Million People | 0 | - | 4.95 | 138,504 |
| Countries Less Populous Than Their Neighbors | 0 | - | 4.96 | 81,854 |
| Countries by Official Language | 0 | - | 4.95 | 195,654 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.91 | 297,129 |
| Countries in their Native Language | 0 | - | 4.99 | 199,428 |
| Subdivisions by Country | 0 | - | 4.87 | 50,538 |
| Megadiverse Countries | 0 | - | 4.96 | 135,158 |
| Countries With the Most English Speakers | 0 | - | 4.86 | 132,451 |
| Countries Producing the Most Sugarcane | 0 | - | 4.94 | 55,464 |
| Countries with Multiple Big Islands | 0 | - | 4.92 | 126,347 |
| Top 10 Wheat-Producing Countries | 0 | - | 4.89 | 75,165 |
| 15 Biggest Island Countries | 0 | - | 4.98 | 163,378 |
| Countries Bigger Than Their Neighbors | 0 | - | 4.93 | 154,471 |
| Countries with Multiple Populous Islands | 0 | - | 4.89 | 95,749 |
| Countries in Relation to Cities #1 | 0 | - | 4.92 | 45,208 |
| Countries by Sports League Revenue | 0 | - | 4.95 | 78,100 |
| Landmarks of Countries #1 | 0 | - | 4.88 | 108,273 |
| Countries Furthest from the United States | 0 | - | 4.94 | 89,332 |
| Countries with the Highest HDI | 0 | - | 4.95 | 137,062 |
| Straight Shot to the Arctic Circle | 0 | - | 4.88 | 75,479 |
| Most Dispersed Island Nations | 0 | - | 4.97 | 71,603 |
| Countries of the World in Alphabetical Order | 0 | - | 5.00 | 111,861 |
| World Map Quiz | 0 | - | 4.81 | 65,387 |
| Recognized, Non-Recognized Countries, and Territories of the World | 0 | - | 5.00 | 158,301 |
| Smallest Countries with at Least One Border | 0 | - | 4.87 | 107,532 |
| Countries within the Arctic Circle - Map Quiz | 0 | - | 4.84 | 64,385 |
| Countries by Road Signs | 0 | - | 4.98 | 54,212 |
| Southernmost Countries of the World | 0 | - | 4.99 | 228,689 |
| Countries by Inland Surface Water | 0 | - | 4.93 | 105,690 |
| Top 20 Motor Vehicle Producing Countries | 0 | - | 4.91 | 123,344 |
| Countries With the Most Languages | 0 | - | 4.90 | 202,981 |
| Countries with the Highest Population Under Age 15 | 0 | - | 4.96 | 111,205 |
| Countries with the Highest Population 65 and Older | 0 | - | 4.90 | 94,327 |
| Countries with the Most Prisoners | 0 | - | 4.94 | 99,539 |
| Countries with the Most Domestic Camels | 0 | - | 4.94 | 61,588 |
| Tallest Countries North to South | 0 | - | 4.86 | 129,181 |
| Widest Countries East to West | 0 | - | 4.92 | 130,209 |
| Countries with the Highest Average Elevation | 0 | - | 4.98 | 71,532 |
| Largest Countries by Area or Population | 0 | - | 5.00 | 187,032 |
| Countries with the Most Area in the Southern Hemisphere | 0 | - | 4.99 | 98,440 |
| Most Populous Countries as a Percent of Their Continent | 0 | - | 4.97 | 94,934 |
| Largest Countries as a Percent of Continent | 0 | - | 4.97 | 148,812 |
| Countries with the Most Desert | 0 | - | 4.93 | 128,113 |
| Countries by Contribution to UN Budget | 0 | - | 4.87 | 77,448 |
| Countries with Most Nobel Laureates per Capita | 0 | - | 4.83 | 34,854 |
| Countries With the Tallest People | 0 | - | 4.93 | 95,097 |
| Countries with Double Letters | 0 | - | 4.96 | 96,694 |
| Countries that End in N | 0 | - | 4.95 | 171,573 |
| Countries with Five Letters | 0 | - | 4.96 | 283,228 |
| Countries with Six Letters | 0 | - | 4.94 | 214,033 |
| Countries with W | 0 | - | 4.96 | 160,647 |
| Countries with Z | 0 | - | 4.98 | 291,980 |
| Countries with Letters Missing | 0 | - | 4.96 | 187,016 |
| Countries That End in U | 0 | - | 4.95 | 121,030 |
| Top 20 Longest One-Word Country Names | 0 | - | 4.97 | 134,803 |
| Countries that End in O | 0 | - | 4.92 | 159,677 |
| Countries that End in R | 0 | - | 4.87 | 119,078 |
| Country Names Created by Only 4 Letters | 0 | - | 4.99 | 155,835 |
| Countries Ending in "IA" | 0 | - | 4.99 | 209,476 |
| Countries by First and Last Letter #1 | 0 | - | 4.97 | 170,941 |
| Countries by Last Two Letters | 0 | - | 4.85 | 135,653 |
| Countries by First and Last Letter #2 | 0 | - | 4.96 | 142,583 |
| Countries That End in Y | 0 | - | 4.91 | 186,001 |
| Countries Based on First Two Letters #1 | 0 | - | 4.99 | 198,197 |
| Countries with Cardinal Directions in Their Names | 0 | - | 4.92 | 153,083 |
| Countries that End in I | 0 | - | 4.94 | 135,220 |
| Countries Based on First Two Letters #2 | 0 | - | 4.99 | 184,386 |
| Countries by Initial Letter and Length #1 | 0 | - | 4.98 | 95,940 |
| Countries That End in NIA | 0 | - | 4.92 | 109,928 |
| Countries That End in BIA | 0 | - | 4.93 | 149,408 |
| Countries by Initial Letter and Continent #1 | 0 | - | 4.94 | 167,341 |
| Countries Whose Names Start with Saint | 0 | - | 4.87 | 119,632 |
| Countries That End in RIA | 0 | - | 4.93 | 126,946 |
| Most Common Words in Official Country Names | 0 | - | 4.86 | 111,223 |
| Divided Country Name Puzzle #1 | 0 | - | 4.99 | 228,122 |
| Divided Country Name Puzzle #2 | 0 | - | 4.99 | 133,963 |
| Divided Country Name Puzzle #3 | 0 | - | 4.92 | 126,404 |
| Groups of Countries that Start with the Same 3 Letters | 0 | - | 5.00 | 91,942 |
| Add A Letter - Make a Country | 0 | - | 4.81 | 74,695 |
| Countries With One Word and Three A's | 0 | - | 4.92 | 53,195 |
| Countries with a Unique Last Letter | 0 | - | 4.90 | 103,495 |
| Unique Starting Letter - Countries by Continent | 0 | - | 4.98 | 125,729 |
| Countries that are Free from U.S.A. | 0 | - | 4.89 | 49,550 |
| Countries with the Word "And" | 0 | - | 4.99 | 117,524 |
| Countries Containing Two or More Words | 0 | - | 4.96 | 54,212 |
| Countries that End in L | 0 | - | 4.94 | 156,998 |
| "Stan" Countries Quiz | 0 | - | 4.97 | 216,751 |
| Countries Ending with "An", but not "Stan" | 0 | - | 4.98 | 85,308 |
| City to Country Quiz #1 | 0 | - | 4.97 | 156,156 |
