| Deadliest U.S. Wars | 0 | - | 4.89 | 190,558 |
| US States Quiz | 0 | - | 5.00 | 16,836,998 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,636 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,809 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,349 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,215 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 243,307 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,812 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,097 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 331,156 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,305 |
| Pixelated United States Map | 0 | - | 4.87 | 94,102 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,378 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,547 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,660 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,192 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,231 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,728 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,997 |
| U.S. States By Population | 0 | - | 4.92 | 153,023 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,216 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,336 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,154 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,117 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,480 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,114 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,170 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,578 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,418 |
| US States with an Empty Map | 0 | - | 5.00 | 623,432 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,609 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,348 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,760 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,935 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,480 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,504 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,435 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,827 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,836 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,942 |
| States of Mexico | 0 | - | 4.95 | 175,592 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,510 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,654 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,370 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,465 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,560 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,160 |
| United States Country Quiz | 0 | - | 4.43 | 101,348 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,831 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,689,484 |
| American Founding Fathers | 0 | - | 4.42 | 23,202 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,377 |
| California Groups of Things | 0 | - | 4.25 | 45,428 |
| Los Angeles vs. New York | 0 | - | 4.41 | 19,822 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,251 |
| Famous People from New York by Picture | 0 | - | 4.03 | 27,462 |
| New York Groups of Things | 0 | - | 4.37 | 63,188 |
| People on Money - United States | 0 | - | 4.31 | 63,323 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,411 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,998 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,265 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,049 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,900 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,324 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,802 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 746,330 |
| Names of Generations | 0 | - | 4.10 | 44,296 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,899 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,056 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,931 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,834 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,047 |
| New England States | 0 | - | 4.51 | 59,785 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,751 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,985 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,709 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,927 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,878 |
| U.S. States by Borders | 0 | - | 4.61 | 35,264 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 185,167 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,436 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,966 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,183 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,304 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,717 |
| United States Map Quiz | 0 | - | 4.98 | 4,154,419 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,131 |
| Geography of California | 0 | - | 4.26 | 10,551 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,988 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,886 |
| History of Pennsylvania | 0 | - | 4.16 | 7,129 |
| History of Virginia | 0 | - | 4.31 | 11,590 |
| Events in U.S. History | 0 | - | 4.40 | 28,625 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,685 |
| Flags of North and South America | 0 | - | 4.99 | 372,084 |
| Belize Country Quiz | 0 | - | 4.85 | 20,940 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,183 |
| Top U.S. Universities | 0 | - | 4.15 | 144,872 |
| Largest United States Airlines | 0 | - | 4.39 | 54,997 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,327 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 42,007 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,601 |
| U.S. States by Governor | 0 | - | 4.43 | 18,046 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,674 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,652 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,985 |
| Famous People from Alabama by Picture | 0 | - | 4.07 | 24,036 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,825 |
| Hawaiian Islands | 0 | - | 4.83 | 42,656 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,913 |
| Famous People from Michigan by Picture | 0 | - | 4.30 | 21,373 |
| State Quiz - New York | 0 | - | 4.52 | 46,033 |
| Boroughs of New York City | 0 | - | 4.47 | 84,505 |
| Famous People from Texas by Picture | 0 | - | 3.99 | 33,351 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,284 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,279 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,855 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,714 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,440 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,154 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,955 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,482 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,909 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,023 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,962 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,755 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,726 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,478 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,602 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,859 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,697 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,264 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,697 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,469 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,736 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,673 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,419 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,292 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,008 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,998 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 56,995 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,682 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 53,327 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,269 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,054 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,227 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,026 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,806 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,663 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,889 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,510 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,088 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,328 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,142 |
| Musical Acts from Los Angeles by Two Songs | 0 | - | 4.27 | 16,053 |
| Movies Set in San Francisco | 0 | - | 4.23 | 19,933 |
| Movies Set in Miami | 0 | - | 4.32 | 16,695 |
| Musical Acts from New York City | 0 | - | 3.80 | 10,151 |
| History of New York | 0 | - | 4.36 | 16,337 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,797 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,508 |
| Flyover States | 0 | - | 4.52 | 29,481 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,082 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,084 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,320 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,079 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,286 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,029 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,483 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,833 |
| The Only American Country ... | 0 | - | 4.92 | 121,421 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,959 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,372 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,206 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,349 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,410 |
| History of Florida | 0 | - | 4.45 | 9,813 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,767 |
| History of Texas | 0 | - | 4.43 | 14,608 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,828 |
| Regions of U.S. States | 0 | - | 4.37 | 43,805 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,372 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,553 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,833 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,272 |
| Movies by State | 0 | - | 4.27 | 40,527 |
| Canada Country Quiz | 0 | - | 4.54 | 132,339 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,078 |
| Canada A-Z | 0 | - | 4.73 | 32,781 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,923 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,155 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,319 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,730 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,640 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,158 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,336 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 83,551 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,977 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 52,703 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 48,719 |
