| Countries of Europe Quiz | 0 | - | 5.00 | 3,732,221 |
| Countries of South America | 0 | - | 5.00 | 918,095 |
| Countries of Oceania | 0 | - | 5.00 | 1,044,563 |
| Countries of Asia Quiz | 0 | - | 5.00 | 1,854,925 |
| Landlocked Countries | 0 | - | 4.99 | 415,529 |
| Countries of the World Quiz | 0 | - | 5.00 | 47,071,457 |
| Sahara Desert Countries | 0 | - | 4.98 | 161,372 |
| Himalayan Countries | 0 | - | 4.95 | 136,037 |
| Andean Countries | 0 | - | 4.94 | 83,196 |
| Countries with the Youngest Median Age | 0 | - | 4.97 | 62,516 |
| Countries in the Southern Hemisphere | 0 | - | 4.99 | 123,674 |
| Coffee Producing Countries | 0 | - | 4.83 | 66,207 |
| Countries with Shrinking Populations | 0 | - | 4.94 | 64,855 |
| Danube Countries | 0 | - | 4.97 | 71,280 |
| Countries With an "Ish" Demonym | 0 | - | 4.97 | 116,020 |
| Countries With an "Ese" Demonym | 0 | - | 4.97 | 85,722 |
| Countries with the Worst Passports | 0 | - | 4.94 | 82,899 |
| Countries with the Most Immigrants | 0 | - | 4.90 | 147,844 |
| European Landlocked Countries | 0 | - | 4.99 | 145,984 |
| Partially Recognized Countries | 0 | - | 4.98 | 105,557 |
| Countries with the Most Species | 0 | - | 4.99 | 95,355 |
| Countries 197 to 205 | 0 | - | 4.89 | 69,685 |
| Tropic of Cancer Countries | 0 | - | 4.97 | 53,274 |
| Tropic of Capricorn Countries | 0 | - | 4.96 | 47,446 |
| Countries that Use the Peso | 0 | - | 4.88 | 59,076 |
| Countries with the Largest Exclusive Economic Zone | 0 | - | 4.90 | 72,725 |
| Countries with a AAA Credit Rating | 0 | - | 4.85 | 57,092 |
| Countries in the Alps | 0 | - | 4.86 | 117,149 |
| Top Five Importing Partners by Country | 0 | - | 4.97 | 94,771 |
| Countries, Capitals, Currencies and Official Languages | 0 | - | 5.00 | 105,626 |
| Biggest Import Partners By Country | 0 | - | 4.99 | 78,168 |
| Southernmost Countries by Continent | 0 | - | 4.98 | 95,603 |
| Northernmost Countries by Continent | 0 | - | 4.98 | 115,402 |
| Countries by Population Growth, 1970–Present | 0 | - | 4.91 | 95,154 |
| Five Biggest Countries by Latitude | 0 | - | 4.97 | 99,820 |
| Five Biggest Countries by Longitude | 0 | - | 4.91 | 52,908 |
| Largest Country by Body of Water | 0 | - | 4.96 | 57,709 |
| Countries with the Most Container Port Traffic | 0 | - | 4.92 | 62,221 |
| Bridge and Tunnel Borders | 0 | - | 4.96 | 53,281 |
| Countries with the Longest Road Networks Quiz | 0 | - | 4.90 | 41,148 |
| Countries that Touch the Prime Meridian or Equator | 0 | - | 4.88 | 103,630 |
| Arctic Ocean Countries | 0 | - | 4.95 | 78,895 |
| Countries with the Most Grassland | 0 | - | 4.93 | 76,910 |
| All Countries by Area : Four at a Time | 0 | - | 5.00 | 117,496 |
| Countries with the Most Climate Zones | 0 | - | 4.96 | 67,807 |
| Countries that Host the Most Refugees | 0 | - | 4.95 | 59,356 |
| Countries of the World by Similar Area in 90 Seconds | 0 | - | 4.95 | 45,057 |
| All Countries of the World by Area with Hints | 0 | - | 4.97 | 240,355 |
| World Countries - Blind Typing | 0 | - | 5.00 | 106,246 |
| Countries in Their Own Alphabet | 0 | - | 4.95 | 47,741 |
| Largest Countries By Category | 0 | - | 4.97 | 157,061 |
| Countries by Countries | 0 | - | 4.96 | 62,461 |
| Country Flags with the Most White | 0 | - | 4.87 | 137,698 |
| Countries With the Northernmost Southernmost Point | 0 | - | 4.96 | 62,032 |
| Countries with the Southernmost Northernmost Point | 0 | - | 4.87 | 47,384 |
| Country Flags With Only Two Colors | 0 | - | 4.92 | 87,960 |
| Top 50 Countries by Population - In Order | 0 | - | 4.98 | 325,959 |
| Spanish-Speaking Countries | 0 | - | 4.95 | 372,872 |
| Countries with the Most Tourists Quiz | 0 | - | 4.92 | 402,878 |
| Island Countries | 0 | - | 4.99 | 708,390 |
| Biggest Countries by Area | 0 | - | 4.99 | 1,041,937 |
| Northernmost Countries | 0 | - | 4.99 | 358,787 |
| Countries of North America Quiz | 0 | - | 5.00 | 1,015,440 |
| "Land" Countries | 0 | - | 4.98 | 334,135 |
| Countries of the World with an Empty Map | 0 | - | 5.00 | 3,367,588 |
| Countries More Populous Than Their Neighbors | 0 | - | 4.99 | 171,953 |
| Countries with Megacities | 0 | - | 4.99 | 248,302 |
| Countries With More than 50 Million People | 0 | - | 4.99 | 197,849 |
| Countries with the Most Population Growth by Decade | 0 | - | 4.98 | 112,381 |
| Countries With More than 200 Million People | 0 | - | 4.96 | 136,238 |
| Countries Less Populous Than Their Neighbors | 0 | - | 4.96 | 80,312 |
| Countries by Official Language | 0 | - | 4.95 | 193,222 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.91 | 293,778 |
| Countries in their Native Language | 0 | - | 4.99 | 197,049 |
| Independence from Whom | 0 | - | 4.99 | 210,197 |
| Subdivisions by Country | 0 | - | 4.86 | 50,154 |
| Who Controlled These Colonies? | 0 | - | 4.88 | 131,091 |
| Megadiverse Countries | 0 | - | 4.96 | 134,473 |
| Countries With the Most English Speakers | 0 | - | 4.86 | 130,224 |
| Countries Producing the Most Sugarcane | 0 | - | 4.95 | 55,027 |
| Countries with Multiple Big Islands | 0 | - | 4.93 | 125,552 |
| Top 10 Wheat-Producing Countries | 0 | - | 4.89 | 74,914 |
| 15 Biggest Island Countries | 0 | - | 4.98 | 161,899 |
| Most Recently-Settled Countries | 0 | - | 4.94 | 62,139 |
| Countries of the World in 1938 Quiz | 0 | - | 4.95 | 93,367 |
| Countries Bigger Than Their Neighbors | 0 | - | 4.93 | 153,463 |
| Countries with Multiple Populous Islands | 0 | - | 4.89 | 95,308 |
| Countries in Relation to Cities #1 | 0 | - | 4.92 | 44,789 |
| Countries by Sports League Revenue | 0 | - | 4.95 | 75,967 |
| Landmarks of Countries #1 | 0 | - | 4.88 | 107,529 |
| Countries Furthest from the United States | 0 | - | 4.94 | 88,633 |
| Countries with the Highest HDI | 0 | - | 4.95 | 136,595 |
| Straight Shot to the Arctic Circle | 0 | - | 4.88 | 74,805 |
| Most Dispersed Island Nations | 0 | - | 4.96 | 71,129 |
| Countries of the World in Alphabetical Order | 0 | - | 5.00 | 109,187 |
| World Map Quiz | 0 | - | 4.81 | 63,833 |
| Recognized, Non-Recognized Countries, and Territories of the World | 0 | - | 5.00 | 153,774 |
| Smallest Countries with at Least One Border | 0 | - | 4.87 | 106,607 |
| Countries by Founding Story | 0 | - | 4.95 | 76,738 |
| Southernmost Countries of the World | 0 | - | 4.99 | 226,812 |
| Countries by Inland Surface Water | 0 | - | 4.94 | 104,543 |
| Top 20 Motor Vehicle Producing Countries | 0 | - | 4.91 | 122,266 |
| Countries With the Most Languages | 0 | - | 4.89 | 200,391 |
| Countries with the Highest Population Under Age 15 | 0 | - | 4.95 | 110,136 |
| Countries with the Highest Population 65 and Older | 0 | - | 4.90 | 93,330 |
| Countries with the Most Prisoners | 0 | - | 4.94 | 98,524 |
| Countries with the Most Domestic Camels | 0 | - | 4.94 | 61,089 |
| Tallest Countries North to South | 0 | - | 4.83 | 119,544 |
| Widest Countries East to West | 0 | - | 4.92 | 129,044 |
| Countries with the Highest Average Elevation | 0 | - | 4.98 | 71,291 |
| Largest Countries by Area or Population | 0 | - | 5.00 | 185,513 |
| Countries with the Most Area in the Southern Hemisphere | 0 | - | 4.99 | 97,660 |
| Most Populous Countries as a Percent of Their Continent | 0 | - | 4.97 | 93,876 |
| Largest Countries as a Percent of Continent | 0 | - | 4.97 | 147,855 |
| Countries with the Most Desert | 0 | - | 4.93 | 127,246 |
| Countries by Contribution to UN Budget | 0 | - | 4.87 | 76,787 |
| Countries with Most Nobel Laureates per Capita | 0 | - | 4.84 | 34,647 |
| Countries with Double Letters | 0 | - | 4.96 | 93,727 |
| Countries that End in N | 0 | - | 4.94 | 157,166 |
| Countries with Five Letters Quiz | 0 | - | 4.96 | 259,077 |
| Countries with Six Letters | 0 | - | 4.93 | 210,743 |
| Countries with W | 0 | - | 4.97 | 158,441 |
| Countries with Z | 0 | - | 4.98 | 288,287 |
| Countries with Letters Missing | 0 | - | 4.97 | 184,791 |
| Countries That End in U | 0 | - | 4.95 | 119,625 |
| Top 20 Longest One-Word Country Names | 0 | - | 4.98 | 132,912 |
| Countries that End in O | 0 | - | 4.92 | 158,669 |
| Countries that End in R | 0 | - | 4.87 | 118,385 |
| Country Names Created by Only 4 Letters | 0 | - | 4.99 | 154,941 |
| Countries Ending in "IA" | 0 | - | 4.99 | 207,450 |
| Countries by First and Last Letter #1 | 0 | - | 4.97 | 169,582 |
| Countries by Last Two Letters | 0 | - | 4.85 | 134,676 |
| Countries by First and Last Letter #2 | 0 | - | 4.96 | 141,228 |
| Countries That End in Y | 0 | - | 4.90 | 185,301 |
| Countries Based on First Two Letters #1 | 0 | - | 4.99 | 196,648 |
| Countries with Cardinal Directions in Their Names | 0 | - | 4.92 | 151,932 |
| Countries that End in I | 0 | - | 4.94 | 134,559 |
| Countries Based on First Two Letters #2 | 0 | - | 4.99 | 182,515 |
| Countries by Initial Letter and Length #1 | 0 | - | 4.98 | 95,318 |
| Countries That End in NIA | 0 | - | 4.92 | 109,142 |
| Countries That End in BIA | 0 | - | 4.92 | 147,872 |
| Countries by Initial Letter and Continent #1 | 0 | - | 4.94 | 166,285 |
| Countries Whose Names Start with Saint | 0 | - | 4.87 | 118,655 |
| Countries That End in RIA | 0 | - | 4.93 | 126,212 |
| Most Common Words in Official Country Names | 0 | - | 4.86 | 110,200 |
| Divided Country Name Puzzle #1 | 0 | - | 4.99 | 225,782 |
| Divided Country Name Puzzle #2 | 0 | - | 4.99 | 132,706 |
| Divided Country Name Puzzle #3 | 0 | - | 4.92 | 125,057 |
| Groups of Countries that Start with the Same 3 Letters | 0 | - | 5.00 | 90,616 |
| Add A Letter - Make a Country | 0 | - | 4.82 | 74,043 |
| Countries With One Word and Three A's | 0 | - | 4.92 | 52,301 |
| Countries with a Unique Last Letter | 0 | - | 4.90 | 102,821 |
| Unique Starting Letter - Countries by Continent | 0 | - | 4.98 | 124,713 |
| Countries that are Free from U.S.A. | 0 | - | 4.89 | 48,911 |
| Countries with the Word "And" | 0 | - | 4.99 | 116,374 |
| Countries Containing Two or More Words | 0 | - | 4.96 | 53,022 |
| Countries that End in L | 0 | - | 4.94 | 156,173 |
| "Stan" Countries Quiz | 0 | - | 4.97 | 212,262 |
| Countries Ending with "An", but not "Stan" | 0 | - | 4.98 | 85,024 |
| City to Country Quiz #1 | 0 | - | 4.97 | 155,639 |
| City to Country Quiz #3 | 0 | - | 4.88 | 118,477 |
| 45 European Countries, 45 Cities | 0 | - | 4.95 | 78,540 |
| Five Biggest Countries by Continent | 0 | - | 4.99 | 248,042 |
| Five Poorest Countries by Continent | 0 | - | 4.93 | 199,666 |
| Five Least Populated Countries by Continent | 0 | - | 4.96 | 141,863 |
| Five Smallest Countries by Continent | 0 | - | 4.98 | 162,686 |
| First Five Countries Alphabetically by Continent | 0 | - | 4.94 | 224,081 |
| Last Five Countries Alphabetically by Continent | 0 | - | 4.98 | 151,955 |
| Five Northernmost Capital Cities by Continent | 0 | - | 4.89 | 70,832 |
| Top 15 Countries that Produce the Most Tea | 0 | - | 4.81 | 108,247 |
| Top 10 Countries in Nuclear Power Production | 0 | - | 4.95 | 86,471 |
| 10 Northernmost Countries That Start with S | 0 | - | 4.94 | 62,439 |
| Biggest Countries by Population | 0 | - | 5.00 | 1,438,217 |
| Smallest Countries by Population and Area | 0 | - | 4.99 | 378,445 |
| One Border Countries | 0 | - | 4.98 | 465,830 |
| Countries by Borders in 90 Seconds | 0 | - | 4.99 | 3,808,886 |
| Countries by First Two Letters in 90 Seconds | 0 | - | 4.98 | 5,597,997 |
| Five Most Densely Populated Countries by Continent | 0 | - | 4.95 | 86,174 |
| Five Most Populated Countries by Continent | 0 | - | 4.99 | 266,622 |
| Most Populous Countries with Exceptions | 0 | - | 4.98 | 121,177 |
| Top 10 Most Densely-Populated Countries in Europe | 0 | - | 4.98 | 111,649 |
| Five Least Densely Populated Countries by Continent | 0 | - | 4.92 | 92,975 |
| Countries by Population Range - Tile Select | 0 | - | 4.87 | 58,544 |
| Countries by National Anthem | 0 | - | 4.93 | 71,081 |
| NATO Countries | 0 | - | 4.98 | 277,384 |
| EU Countries Quiz | 0 | - | 4.99 | 271,019 |
| Recently Independent Countries | 0 | - | 4.98 | 158,233 |
| French-Speaking Countries | 0 | - | 4.85 | 269,336 |
| Natural Features of Countries #1 | 0 | - | 4.86 | 83,459 |
| Countries That Use the Euro | 0 | - | 4.95 | 103,601 |
| Countries with the Most Military Troops | 0 | - | 4.95 | 285,847 |
| Countries with Nuclear Weapons | 0 | - | 4.86 | 269,622 |
| German-Speaking Countries | 0 | - | 4.89 | 123,634 |
| Countries with Wild Tigers | 0 | - | 4.96 | 135,915 |
| Countries with Wild Penguins | 0 | - | 4.94 | 99,557 |
| Solve the Secret Country #1 | 0 | - | 4.94 | 163,909 |
| Top Five Countries by Religion | 0 | - | 4.93 | 169,662 |
| Solve the Secret Country #2 | 0 | - | 4.87 | 116,781 |
| Countries by Hottest Recorded Temperature | 0 | - | 4.91 | 111,963 |
| Countries by Coldest Recorded Temperature | 0 | - | 4.83 | 111,193 |
