| Countries of the World Quiz | 0 | - | 5.00 | 47,506,085 |
| Landlocked Countries | 0 | - | 4.99 | 421,053 |
| Countries of Europe Quiz | 0 | - | 5.00 | 3,771,661 |
| Sahara Desert Countries | 0 | - | 4.98 | 164,007 |
| Himalayan Countries | 0 | - | 4.95 | 138,318 |
| Andean Countries | 0 | - | 4.93 | 84,380 |
| Countries with the Youngest Median Age | 0 | - | 4.97 | 63,601 |
| Countries in the Southern Hemisphere | 0 | - | 4.99 | 125,517 |
| Coffee Producing Countries | 0 | - | 4.83 | 67,231 |
| Countries with Shrinking Populations | 0 | - | 4.94 | 65,634 |
| Danube Countries | 0 | - | 4.97 | 71,904 |
| Countries With an "Ish" Demonym | 0 | - | 4.98 | 116,881 |
| Countries With an "Ese" Demonym | 0 | - | 4.97 | 86,304 |
| Countries with the Worst Passports | 0 | - | 4.94 | 84,100 |
| Countries with the Most Immigrants | 0 | - | 4.90 | 149,574 |
| European Landlocked Countries | 0 | - | 4.99 | 147,035 |
| Partially Recognized Countries | 0 | - | 4.98 | 106,467 |
| Countries with the Most Species | 0 | - | 4.99 | 103,153 |
| Countries 197 to 205 | 0 | - | 4.89 | 70,618 |
| Tropic of Cancer Countries | 0 | - | 4.97 | 53,535 |
| Tropic of Capricorn Countries | 0 | - | 4.96 | 47,677 |
| Countries that Use the Peso | 0 | - | 4.89 | 59,472 |
| Countries with the Largest Exclusive Economic Zone | 0 | - | 4.90 | 73,153 |
| Countries with a AAA Credit Rating | 0 | - | 4.86 | 57,559 |
| Countries in the Alps | 0 | - | 4.87 | 118,046 |
| Top Five Importing Partners by Country | 0 | - | 4.97 | 100,373 |
| Countries, Capitals, Currencies and Official Languages | 0 | - | 5.00 | 106,840 |
| Biggest Import Partners By Country | 0 | - | 4.99 | 78,581 |
| Southernmost Countries by Continent | 0 | - | 4.98 | 96,509 |
| Northernmost Countries by Continent | 0 | - | 4.98 | 116,386 |
| Countries by Population Growth, 1970–Present | 0 | - | 4.92 | 95,874 |
| Five Biggest Countries by Latitude | 0 | - | 4.97 | 100,543 |
| Five Biggest Countries by Longitude | 0 | - | 4.91 | 53,403 |
| Largest Country by Body of Water | 0 | - | 4.96 | 58,114 |
| Countries with the Most Container Port Traffic | 0 | - | 4.92 | 62,751 |
| Bridge and Tunnel Borders | 0 | - | 4.96 | 53,587 |
| Countries with the Longest Road Networks Quiz | 0 | - | 4.90 | 41,448 |
| Countries that Touch the Prime Meridian or Equator | 0 | - | 4.88 | 104,122 |
| Arctic Ocean Countries | 0 | - | 4.95 | 79,388 |
| Countries with the Most Grassland | 0 | - | 4.94 | 77,421 |
| All Countries by Area : Four at a Time | 0 | - | 5.00 | 118,671 |
| Countries with the Most Climate Zones | 0 | - | 4.96 | 68,217 |
| Countries that Host the Most Refugees | 0 | - | 4.95 | 59,728 |
| Countries of the World by Similar Area in 90 Seconds | 0 | - | 4.95 | 45,890 |
| All Countries of the World by Area with Hints | 0 | - | 4.97 | 243,478 |
| World Countries - Blind Typing | 0 | - | 5.00 | 107,829 |
| Countries in Their Own Alphabet | 0 | - | 4.95 | 48,146 |
| Largest Countries By Category | 0 | - | 4.97 | 158,021 |
| Countries by Countries | 0 | - | 4.96 | 63,087 |
| Country Flags with the Most White | 0 | - | 4.85 | 138,546 |
| Countries With the Northernmost Southernmost Point | 0 | - | 4.96 | 62,239 |
| Countries with the Southernmost Northernmost Point | 0 | - | 4.87 | 47,530 |
| Country Flags With Only Two Colors | 0 | - | 4.91 | 88,567 |
| Top 50 Countries by Population - In Order | 0 | - | 4.98 | 330,764 |
| Spanish-Speaking Countries | 0 | - | 4.95 | 375,243 |
| Countries with the Most Tourists Quiz | 0 | - | 4.92 | 406,635 |
| Island Countries | 0 | - | 4.99 | 710,671 |
| Biggest Countries by Area | 0 | - | 5.00 | 1,048,620 |
| Northernmost Countries | 0 | - | 4.99 | 361,526 |
| Countries of South America | 0 | - | 5.00 | 925,900 |
| Countries of Oceania | 0 | - | 5.00 | 1,055,116 |
| Countries of Asia Quiz | 0 | - | 5.00 | 1,873,936 |
| "Land" Countries | 0 | - | 4.98 | 337,011 |
| Countries of the World with an Empty Map | 0 | - | 5.00 | 3,381,204 |
| Countries More Populous Than Their Neighbors | 0 | - | 4.99 | 173,637 |
| Countries with Megacities | 0 | - | 4.99 | 263,895 |
| Countries With More than 50 Million People | 0 | - | 4.99 | 199,484 |
| Countries with the Most Population Growth by Decade | 0 | - | 4.98 | 113,334 |
| Countries With More than 200 Million People | 0 | - | 4.96 | 137,763 |
| Countries Less Populous Than Their Neighbors | 0 | - | 4.96 | 81,390 |
| Countries by Official Language | 0 | - | 4.95 | 195,052 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.91 | 296,117 |
| Countries in their Native Language | 0 | - | 4.99 | 198,593 |
| Independence from Whom | 0 | - | 4.99 | 211,864 |
| Subdivisions by Country | 0 | - | 4.86 | 50,386 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 132,555 |
| Megadiverse Countries | 0 | - | 4.96 | 134,932 |
| Countries With the Most English Speakers | 0 | - | 4.86 | 131,917 |
| Countries Producing the Most Sugarcane | 0 | - | 4.95 | 55,292 |
| Countries with Multiple Big Islands | 0 | - | 4.93 | 125,871 |
| Top 10 Wheat-Producing Countries | 0 | - | 4.89 | 75,075 |
| 15 Biggest Island Countries | 0 | - | 4.98 | 162,993 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,534 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 94,331 |
| Countries Bigger Than Their Neighbors | 0 | - | 4.93 | 153,974 |
| Countries with Multiple Populous Islands | 0 | - | 4.89 | 95,593 |
| Countries in Relation to Cities #1 | 0 | - | 4.92 | 45,053 |
| Countries by Sports League Revenue | 0 | - | 4.94 | 77,475 |
| Landmarks of Countries #1 | 0 | - | 4.88 | 107,821 |
| Countries Furthest from the United States | 0 | - | 4.94 | 89,130 |
| Countries with the Highest HDI | 0 | - | 4.95 | 136,908 |
| Straight Shot to the Arctic Circle | 0 | - | 4.88 | 75,295 |
| Most Dispersed Island Nations | 0 | - | 4.97 | 71,440 |
| Countries of the World in Alphabetical Order | 0 | - | 5.00 | 110,891 |
| World Map Quiz | 0 | - | 4.81 | 64,956 |
| Recognized, Non-Recognized Countries, and Territories of the World | 0 | - | 5.00 | 156,728 |
| Smallest Countries with at Least One Border | 0 | - | 4.87 | 107,258 |
| Countries by Founding Story | 0 | - | 4.95 | 77,283 |
| Countries by Road Signs | 0 | - | 4.98 | 53,887 |
| Southernmost Countries of the World | 0 | - | 4.99 | 227,895 |
| Countries by Inland Surface Water | 0 | - | 4.93 | 105,162 |
| Top 20 Motor Vehicle Producing Countries | 0 | - | 4.91 | 122,884 |
| Countries With the Most Languages | 0 | - | 4.90 | 201,944 |
| Countries with the Highest Population Under Age 15 | 0 | - | 4.95 | 110,801 |
| Countries with the Highest Population 65 and Older | 0 | - | 4.90 | 93,921 |
| Countries with the Most Prisoners | 0 | - | 4.94 | 99,217 |
| Countries with the Most Domestic Camels | 0 | - | 4.94 | 61,390 |
| Tallest Countries North to South | 0 | - | 4.83 | 120,500 |
| Widest Countries East to West | 0 | - | 4.92 | 129,562 |
| Countries with the Highest Average Elevation | 0 | - | 4.98 | 71,429 |
| Largest Countries by Area or Population | 0 | - | 5.00 | 186,265 |
| Countries with the Most Area in the Southern Hemisphere | 0 | - | 4.99 | 98,086 |
| Most Populous Countries as a Percent of Their Continent | 0 | - | 4.97 | 94,695 |
| Largest Countries as a Percent of Continent | 0 | - | 4.97 | 148,474 |
| Countries with the Most Desert | 0 | - | 4.93 | 127,761 |
| Countries by Contribution to UN Budget | 0 | - | 4.87 | 77,333 |
| Countries with Most Nobel Laureates per Capita | 0 | - | 4.83 | 34,780 |
| Countries with Double Letters | 0 | - | 4.96 | 95,949 |
| Countries that End in N | 0 | - | 4.95 | 170,857 |
| Countries with Five Letters | 0 | - | 4.96 | 281,975 |
| Countries with Six Letters | 0 | - | 4.94 | 213,271 |
| Countries with W | 0 | - | 4.97 | 160,123 |
| Countries with Z | 0 | - | 4.98 | 291,143 |
| Countries with Letters Missing | 0 | - | 4.96 | 186,481 |
| Countries That End in U | 0 | - | 4.95 | 120,735 |
| Top 20 Longest One-Word Country Names | 0 | - | 4.98 | 134,250 |
| Countries that End in O | 0 | - | 4.92 | 159,430 |
| Countries that End in R | 0 | - | 4.87 | 118,899 |
| Country Names Created by Only 4 Letters | 0 | - | 4.99 | 155,668 |
| Countries Ending in "IA" | 0 | - | 4.99 | 208,849 |
| Countries by First and Last Letter #1 | 0 | - | 4.97 | 170,546 |
| Countries by Last Two Letters | 0 | - | 4.85 | 135,377 |
| Countries by First and Last Letter #2 | 0 | - | 4.96 | 142,278 |
| Countries That End in Y | 0 | - | 4.91 | 185,805 |
| Countries Based on First Two Letters #1 | 0 | - | 4.99 | 197,741 |
| Countries with Cardinal Directions in Their Names | 0 | - | 4.92 | 152,729 |
| Countries that End in I | 0 | - | 4.94 | 135,028 |
| Countries Based on First Two Letters #2 | 0 | - | 4.99 | 183,911 |
| Countries by Initial Letter and Length #1 | 0 | - | 4.98 | 95,752 |
| Countries That End in NIA | 0 | - | 4.92 | 109,698 |
| Countries That End in BIA | 0 | - | 4.93 | 149,094 |
| Countries by Initial Letter and Continent #1 | 0 | - | 4.94 | 166,980 |
| Countries Whose Names Start with Saint | 0 | - | 4.87 | 119,312 |
| Countries That End in RIA | 0 | - | 4.93 | 126,732 |
| Most Common Words in Official Country Names | 0 | - | 4.86 | 110,906 |
| Divided Country Name Puzzle #1 | 0 | - | 4.99 | 227,309 |
| Divided Country Name Puzzle #2 | 0 | - | 4.99 | 133,536 |
| Divided Country Name Puzzle #3 | 0 | - | 4.92 | 125,941 |
| Groups of Countries that Start with the Same 3 Letters | 0 | - | 5.00 | 91,509 |
| Add A Letter - Make a Country | 0 | - | 4.82 | 74,506 |
| Countries With One Word and Three A's | 0 | - | 4.92 | 52,922 |
| Countries with a Unique Last Letter | 0 | - | 4.90 | 103,412 |
| Unique Starting Letter - Countries by Continent | 0 | - | 4.98 | 125,416 |
| Countries that are Free from U.S.A. | 0 | - | 4.89 | 49,358 |
| Countries with the Word "And" | 0 | - | 4.99 | 117,153 |
| Countries Containing Two or More Words | 0 | - | 4.97 | 53,845 |
| Countries that End in L | 0 | - | 4.94 | 156,745 |
| "Stan" Countries Quiz | 0 | - | 4.97 | 215,168 |
| Countries Ending with "An", but not "Stan" | 0 | - | 4.98 | 85,238 |
| City to Country Quiz #1 | 0 | - | 4.97 | 155,950 |
| City to Country Quiz #3 | 0 | - | 4.88 | 118,887 |
| 45 European Countries, 45 Cities | 0 | - | 4.95 | 78,914 |
| Five Biggest Countries by Continent | 0 | - | 4.99 | 249,558 |
| Five Poorest Countries by Continent | 0 | - | 4.93 | 200,512 |
| Five Least Populated Countries by Continent | 0 | - | 4.95 | 142,890 |
| Five Smallest Countries by Continent | 0 | - | 4.98 | 163,412 |
| First Five Countries Alphabetically by Continent | 0 | - | 4.94 | 225,271 |
| Last Five Countries Alphabetically by Continent | 0 | - | 4.98 | 152,788 |
| Five Northernmost Capital Cities by Continent | 0 | - | 4.89 | 71,048 |
| Top 10 Countries in Nuclear Power Production | 0 | - | 4.95 | 86,670 |
| 10 Northernmost Countries That Start with S | 0 | - | 4.94 | 62,802 |
| Biggest Countries by Population | 0 | - | 5.00 | 1,446,660 |
| Smallest Countries by Population and Area | 0 | - | 4.99 | 380,571 |
| One Border Countries | 0 | - | 4.98 | 469,007 |
| Countries by Borders in 90 Seconds | 0 | - | 4.99 | 3,831,009 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,626,877 |
| Every Country in its Official/Native Language | 0 | - | 4.98 | 25,415 |
| Five Most Densely Populated Countries by Continent | 0 | - | 4.96 | 86,783 |
| Five Most Populated Countries by Continent | 0 | - | 4.99 | 267,970 |
| Most Populous Countries with Exceptions | 0 | - | 4.98 | 121,990 |
| Top 10 Most Densely-Populated Countries in Europe | 0 | - | 4.98 | 112,450 |
| Five Least Densely Populated Countries by Continent | 0 | - | 4.92 | 93,607 |
| Countries by Population Range - Tile Select | 0 | - | 4.87 | 59,127 |
| Countries by National Anthem | 0 | - | 4.93 | 71,261 |
| NATO Countries | 0 | - | 4.98 | 280,809 |
| EU Countries Quiz | 0 | - | 4.99 | 274,697 |
| Recently Independent Countries | 0 | - | 4.98 | 159,352 |
| French-Speaking Countries | 0 | - | 4.85 | 270,654 |
| Natural Features of Countries #1 | 0 | - | 4.87 | 83,861 |
| Countries That Use the Euro | 0 | - | 4.95 | 105,219 |
| Countries with the Most Military Troops | 0 | - | 4.95 | 288,732 |
| Countries with Nuclear Weapons | 0 | - | 4.86 | 273,669 |
| German-Speaking Countries | 0 | - | 4.91 | 145,633 |
| Countries with Wild Tigers | 0 | - | 4.96 | 136,880 |
| Countries with Wild Penguins | 0 | - | 4.94 | 100,213 |
| Solve the Secret Country #1 | 0 | - | 4.93 | 165,976 |
| Top Five Countries by Religion | 0 | - | 4.93 | 171,798 |
| Solve the Secret Country #2 | 0 | - | 4.87 | 118,588 |
| Countries by Hottest Recorded Temperature | 0 | - | 4.92 | 112,803 |
| Countries by Coldest Recorded Temperature | 0 | - | 4.83 | 112,050 |
