| Deadliest U.S. Wars | 0 | - | 4.83 | 158,261 |
| US States Quiz | 0 | - | 5.00 | 14,760,610 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.84 | 54,853 |
| Total United States Immigration by Country | 0 | - | 4.89 | 96,824 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.93 | 147,125 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.95 | 185,193 |
| U.S. Cabinet Departments | 0 | - | 4.85 | 67,660 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.97 | 340,351 |
| Pixelated United States Map | 0 | - | 4.90 | 82,306 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 93,462 |
| Countries that Visit the United States the Most | 0 | - | 4.95 | 78,788 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 100,646 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 96,251 |
| 10 Southernmost U.S. States | 0 | - | 4.84 | 99,313 |
| U.S. States with Short Names | 0 | - | 4.87 | 129,825 |
| U.S. States that Start with M | 0 | - | 4.91 | 150,566 |
| U.S. States By Population | 0 | - | 4.90 | 130,043 |
| U.S. States that Start with N | 0 | - | 4.95 | 155,635 |
| U.S. States with Longest Names | 0 | - | 4.84 | 36,091 |
| U.S. States with a Unique First Letter | 0 | - | 4.95 | 77,909 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 58,400 |
| The Only Remaining U.S. State . . . | 0 | - | 4.94 | 56,155 |
| US States with an Empty Map | 0 | - | 5.00 | 554,709 |
| 10 Longest Rivers in the United States | 0 | - | 4.82 | 35,044 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.95 | 274,489 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 124,552 |
| Countries that Beat the United States | 0 | - | 4.92 | 145,825 |
| Louisiana Purchase with a Map | 0 | - | 4.95 | 36,275 |
| U.S. States with the Longest International Borders | 0 | - | 4.81 | 40,894 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.89 | 89,572 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 73,249 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 71,344 |
| U.S. States or European Countries by Population | 0 | - | 4.98 | 116,191 |
| Hawaiian Islands Map Quiz | 0 | - | 4.88 | 21,032 |
| People on Money - United States | 0 | - | 4.31 | 61,797 |
| U.S. History Groups of Two | 0 | - | 4.28 | 35,359 |
| Name a Valid U.S. State #1 | 0 | - | 4.95 | 184,945 |
| Top 10 Coldest U.S. States | 0 | - | 4.91 | 100,326 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 100,815 |
| Top 10 Most Native American U.S. States | 0 | - | 4.84 | 71,372 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 57,135 |
| U.S. History for Dummies | 0 | - | 4.49 | 65,442 |
| States of Mexico | 0 | - | 4.95 | 141,556 |
| Mexico States Map Quiz | 0 | - | 4.84 | 90,680 |
| Events in U.S. History | 0 | - | 4.39 | 26,133 |
| U.S. State Nicknames Quiz | 0 | - | 4.49 | 46,191 |
| U.S. National Parks Quiz | 0 | - | 4.79 | 46,788 |
| Countries with American Expatriates | 0 | - | 4.58 | 40,940 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 38,342 |
| United States Country Quiz | 0 | - | 4.45 | 89,245 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 72,500 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,175,362 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.76 | 57,099 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 41,303 |
| The Life of Thomas Edison | 0 | - | 4.03 | 4,649 |
| Valid Answer - U.S. History | 0 | - | 4.19 | 21,325 |
| Countries Closest to Canada | 0 | - | 4.90 | 184,589 |
| Asian Last Names in the United States | 0 | - | 4.41 | 43,316 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.18 | 701,401 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 198,677 |
| U.S. Federal Agency Acronyms | 0 | - | 4.51 | 75,929 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 54,562 |
| Six Flags Over Texas | 0 | - | 4.84 | 58,804 |
| New England States | 0 | - | 4.54 | 52,443 |
| US States by Land Area | 0 | - | 4.58 | 48,513 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 36,194 |
| Add a Letter - Make a U.S. State | 0 | - | 4.74 | 76,573 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 51,106 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.78 | 37,327 |
| Save Americans by Guessing U.S. States | 0 | - | 4.57 | 150,422 |
| 10 Easternmost U.S. States | 0 | - | 4.54 | 53,012 |
| The Only U.S. State ... #1 | 0 | - | 4.51 | 82,642 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.47 | 40,520 |
| Countries that Beat Canada | 0 | - | 4.91 | 78,243 |
| United States Map Quiz | 0 | - | 4.98 | 3,905,594 |
| Red State or Blue State Trait? | 0 | - | 4.43 | 48,449 |
| History of Pennsylvania | 0 | - | 4.09 | 6,437 |
| History of Virginia | 0 | - | 4.33 | 10,942 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 49,223 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.70 | 59,941 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.75 | 54,040 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.76 | 52,933 |
| Longest U.S. State Borders | 0 | - | 4.65 | 34,278 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 58,309 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.65 | 46,740 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.54 | 31,780 |
| U.S. States with the Fewest Borders | 0 | - | 4.76 | 105,806 |
| U.S. States with the Most Borders | 0 | - | 4.56 | 61,070 |
| Belize Country Quiz | 0 | - | 4.88 | 18,780 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 17,102 |
| Top U.S. Universities | 0 | - | 4.12 | 113,112 |
| Largest United States Airlines | 0 | - | 4.38 | 52,048 |
| Third Most Common Language by U.S. State | 0 | - | 4.91 | 107,129 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.38 | 7,883 |
| U.S. States by Governor Quiz | 0 | - | 4.42 | 16,957 |
| U.S. Political Parties in History | 0 | - | 4.42 | 26,180 |
| U.S. Government Agencies | 0 | - | 4.41 | 17,687 |
| U.S. Presidents by Picture | 0 | - | 4.85 | 394,813 |
| American Founding Fathers | 0 | - | 4.36 | 22,097 |
| Florida Pro Sport Teams | 0 | - | 4.66 | 10,332 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.92 | 49,745 |
| Georgia ... or Georgia? | 0 | - | 4.79 | 71,967 |
| Dominica Country Quiz | 0 | - | 4.83 | 17,806 |
| American Legal Vocabulary | 0 | - | 4.40 | 32,164 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 31,749 |
| Cities by Picture #2 | 0 | - | 4.22 | 32,384 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.52 | 34,043 |
| Biggest Trading Partners - US | 0 | - | 4.63 | 101,597 |
| American Geography Quiz for Dummies | 0 | - | 4.33 | 53,024 |
| The U.S. Government - How Does it Work? | 0 | - | 4.32 | 39,874 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 353,349 |
| Famous People from California by Picture | 0 | - | 4.31 | 31,804 |
| California Groups of Things | 0 | - | 4.23 | 42,846 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.40 | 55,717 |
| New York Groups of Things | 0 | - | 4.39 | 57,313 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.34 | 70,811 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.49 | 20,501 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.44 | 47,710 |
| Flyover States | 0 | - | 4.51 | 28,003 |
| U.S. States With Double Letters | 0 | - | 4.66 | 4,292 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.30 | 57,811 |
| U.S. States by Borders | 0 | - | 4.56 | 26,347 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 37,443 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 35,365 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 69,347 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 44,089 |
| U.S. State Superlatives #1 | 0 | - | 4.46 | 75,525 |
| U.S. State Superlatives #2 | 0 | - | 4.51 | 37,343 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.38 | 120,986 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.54 | 60,643 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 103,400 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.49 | 35,070 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.79 | 58,557 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.45 | 39,403 |
| Flags of North and South America Quiz | 0 | - | 4.99 | 310,244 |
| The Only American Country ... | 0 | - | 4.94 | 109,818 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 100,950 |
| U.S. State Border Crossings | 0 | - | 4.96 | 82,171 |
| U.S. Citizenship Test Questions | 0 | - | 4.86 | 222,242 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.83 | 33,364 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 65,385 |
| Name a Valid U.S. President #1 | 0 | - | 4.93 | 167,332 |
| Play-Doh Presidents | 0 | - | 5.00 | 74,629 |
| Cities and Towns of Massachusetts | 0 | - | 4.89 | 60,467 |
| Who Did that Motown Song | 0 | - | 4.45 | 12,667 |
| Old West History | 0 | - | 4.28 | 14,789 |
| Life of Benjamin Franklin | 0 | - | 4.18 | 6,221 |
| American Revolution - Multiple Choice | 0 | - | 4.32 | 18,815 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 19,775 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 27,506 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.71 | 25,279 |
| Which U.S. State - Multiple Choice | 0 | - | 4.45 | 18,986 |
| Movies by State Quiz | 0 | - | 4.23 | 39,374 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.41 | 49,911 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.60 | 31,102 |
| Canada Country Quiz | 0 | - | 4.54 | 121,480 |
| Canada Cities Map Quiz | 0 | - | 4.65 | 109,464 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 133,867 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 62,945 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.93 | 49,415 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 58,849 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 46,530 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 93,713 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 100,208 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 93,717 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 81,493 |
| Mexico Country Quiz | 0 | - | 4.48 | 66,511 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.90 | 40,079 |
| Brazil States Map Quiz | 0 | - | 4.83 | 39,622 |
| States of Brazil | 0 | - | 4.97 | 68,764 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 18,417 |
| U.S. States by Picture #1 | 0 | - | 4.15 | 14,360 |
| Most-Visited U.S. Cities | 0 | - | 4.87 | 72,821 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 62,917 |
| Senators Who Ran For President | 0 | - | 4.28 | 16,305 |
| U.S. Electoral College Landslides | 0 | - | 4.33 | 21,010 |
| Geography of California | 0 | - | 4.23 | 9,678 |
| California Pro Sport Teams | 0 | - | 4.23 | 22,122 |
| Chicago City Trivia | 0 | - | 4.26 | 30,411 |
| Boston Talk to English Translation Quiz | 0 | - | 4.46 | 14,158 |
| New York Pro Sport Teams | 0 | - | 4.35 | 23,167 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.83 | 21,675 |
| Texas Pro Sport Teams | 0 | - | 4.11 | 16,232 |
| Washington State by Picture | 0 | - | 4.16 | 7,145 |
| Embarrassing Chapters in US History | 0 | - | 4.15 | 31,477 |
| Events by U.S. State #1 | 0 | - | 4.41 | 21,780 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 31,464 |
| A Superlative for Every U.S. State | 0 | - | 4.47 | 24,923 |
| Most Valuable Crops by U.S. State | 0 | - | 4.38 | 36,791 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.30 | 34,777 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 31,222 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.51 | 27,573 |
| U.S. States with the Most Venomous Snake Species | 0 | - | 4.47 | 25,042 |
| U.S. States with the Most Endangered Species | 0 | - | 4.50 | 13,865 |
| African-American Historical Figures | 0 | - | 4.14 | 16,401 |
| Canadian Prime Ministers Quiz | 0 | - | 4.64 | 49,707 |
| Capitals of Canadian Provinces | 0 | - | 4.86 | 73,678 |
| Most-Visited Countries by Canadians | 0 | - | 4.79 | 37,917 |
| U.S. History Multiple Choice #5 | 0 | - | 4.34 | 10,408 |
| The United States... or the United Kingdom? | 0 | - | 4.89 | 90,338 |
