| Deadliest U.S. Wars | 0 | - | 4.89 | 191,620 |
| US States Quiz | 0 | - | 5.00 | 16,971,065 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,390 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,387 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,225 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,362 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,983 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,062 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,632 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,829 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,508 |
| Pixelated United States Map | 0 | - | 4.88 | 94,710 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,362 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,315 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,901 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 112,129 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,128 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,165 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,155 |
| U.S. States By Population | 0 | - | 4.92 | 154,033 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,077 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,804 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,772 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,482 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,002 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,353 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,047 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,428 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,165 |
| US States with an Empty Map | 0 | - | 5.00 | 627,801 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,340 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,956 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,863 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,983 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,296 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,741 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,355 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,701 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,164 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,350 |
| States of Mexico | 0 | - | 4.96 | 177,815 |
| Mexico States Map Quiz | 0 | - | 4.84 | 105,487 |
| Events in U.S. History | 0 | - | 4.41 | 28,792 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,086 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,779 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,691 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,656 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,265 |
| United States Country Quiz | 0 | - | 4.43 | 102,064 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,035 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,720,698 |
| American Founding Fathers | 0 | - | 4.42 | 23,267 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,660 |
| California Groups of Things | 0 | - | 4.26 | 45,728 |
| Los Angeles vs. New York | 0 | - | 4.41 | 19,999 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,312 |
| Famous People from New York by Picture | 0 | - | 4.03 | 27,588 |
| New York Groups of Things | 0 | - | 4.39 | 71,786 |
| People on Money - United States | 0 | - | 4.31 | 63,416 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,570 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,185 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,564 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,954 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,165 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,845 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 53,277 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 749,193 |
| Names of Generations | 0 | - | 4.09 | 45,433 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,324 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,377 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,107 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,074 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,072 |
| New England States | 0 | - | 4.51 | 59,882 |
| U.S. States by Land Area | 0 | - | 4.63 | 53,016 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,101 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,067 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,243 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,102 |
| U.S. States by Borders | 0 | - | 4.62 | 35,444 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 188,303 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,657 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,286 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,411 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,870 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,935 |
| United States Map Quiz | 0 | - | 4.98 | 4,168,762 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,979 |
| Geography of California | 0 | - | 4.26 | 10,612 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,500 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,950 |
| History of Pennsylvania | 0 | - | 4.16 | 7,160 |
| History of Virginia | 0 | - | 4.33 | 11,637 |
| Flags of North and South America | 0 | - | 4.99 | 376,167 |
| Belize Country Quiz | 0 | - | 4.85 | 21,064 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,289 |
| Top U.S. Universities | 0 | - | 4.15 | 145,680 |
| Largest United States Airlines | 0 | - | 4.39 | 55,133 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,356 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,835 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,840 |
| U.S. States by Governor | 0 | - | 4.43 | 18,109 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,753 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,760 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,110 |
| Famous People from Alabama by Picture | 0 | - | 4.07 | 24,117 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,899 |
| Hawaiian Islands | 0 | - | 4.83 | 42,892 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,173 |
| Famous People from Michigan by Picture | 0 | - | 4.30 | 21,474 |
| State Quiz - New York | 0 | - | 4.52 | 46,356 |
| Boroughs of New York City | 0 | - | 4.47 | 84,894 |
| Famous People from Texas by Picture | 0 | - | 3.99 | 33,440 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,567 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,475 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,096 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,038 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,599 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,310 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,749 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,553 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,327 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,112 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,238 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,909 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,070 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,648 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,738 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,956 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,950 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,410 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 63,977 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,560 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,827 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,804 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,153 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,354 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,982 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,442 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,472 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,448 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,164 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,344 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,585 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,475 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,640 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 36,782 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,539 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,910 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,938 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,999 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,699 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,269 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,449 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,290 |
| Musical Acts from Los Angeles by Two Songs | 0 | - | 4.27 | 16,266 |
| Movies Set in San Francisco | 0 | - | 4.23 | 19,955 |
| Movies Set in Miami | 0 | - | 4.32 | 16,711 |
| Musical Acts from New York City | 0 | - | 3.80 | 10,189 |
| History of New York | 0 | - | 4.36 | 16,406 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,016 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,558 |
| Flyover States | 0 | - | 4.52 | 29,579 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,233 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,362 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,443 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,172 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,910 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,285 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,648 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,160 |
| The Only American Country ... | 0 | - | 4.92 | 122,103 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,556 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,802 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,671 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,849 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,499 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,781 |
| History of Florida | 0 | - | 4.45 | 9,867 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,858 |
| History of Texas | 0 | - | 4.43 | 14,679 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,204 |
| Regions of U.S. States | 0 | - | 4.37 | 44,124 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,410 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,624 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,922 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,353 |
| Movies by State | 0 | - | 4.27 | 40,598 |
| Canada Country Quiz | 0 | - | 4.55 | 132,938 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,528 |
| Canada A-Z | 0 | - | 4.73 | 32,944 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,158 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,928 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,585 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,696 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,571 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.94 | 92,474 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,706 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 53,035 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 49,043 |
