| Deadliest U.S. Wars | 0 | - | 4.89 | 191,805 |
| US States Quiz | 0 | - | 5.00 | 16,999,454 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,501 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,432 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,577 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 246,541 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,107 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,738 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,701 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 335,503 |
| Pixelated United States Map | 0 | - | 4.88 | 94,827 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,572 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,457 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,092 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,296 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,328 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,377 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,397 |
| U.S. States By Population | 0 | - | 4.92 | 154,168 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,248 |
| U.S. States with Longest Names | 0 | - | 4.85 | 44,908 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,876 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,543 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,112 |
| Events in U.S. History | 0 | - | 4.41 | 28,830 |
| US States with an Empty Map | 0 | - | 5.00 | 628,808 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,404 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,245 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,693 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,316 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,482 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,054 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,173 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,308 |
| People on Money - United States | 0 | - | 4.31 | 63,435 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,587 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,578 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,883 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,536 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,869 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,221 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,424 |
| States of Mexico | 0 | - | 4.96 | 178,325 |
| Mexico States Map Quiz | 0 | - | 4.84 | 105,675 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,170 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,827 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,749 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,679 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,282 |
| United States Country Quiz | 0 | - | 4.43 | 102,219 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,071 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,726,614 |
| American Founding Fathers | 0 | - | 4.42 | 23,274 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,226 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,604 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,619 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,504 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,214 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,016 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 57,339 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 749,862 |
| Names of Generations | 0 | - | 4.09 | 45,528 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,542 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,437 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,150 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,122 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,538 |
| New England States | 0 | - | 4.51 | 59,900 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,067 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,121 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,163 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,287 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,149 |
| U.S. States by Borders | 0 | - | 4.62 | 35,488 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 188,905 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,686 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,347 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,450 |
| Countries that Beat Canada | 0 | - | 4.90 | 99,017 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,972 |
| United States Map Quiz | 0 | - | 4.98 | 4,171,667 |
| History of Pennsylvania | 0 | - | 4.16 | 7,168 |
| History of Virginia | 0 | - | 4.33 | 11,642 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,148 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,101 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,659 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.70 | 60,940 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,120 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,951 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,139 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,983 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.44 | 70,618 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.74 | 64,210 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,574 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,836 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,229 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,372 |
| Flags of North and South America | 0 | - | 4.99 | 377,147 |
| Belize Country Quiz | 0 | - | 4.85 | 21,094 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,304 |
| Top U.S. Universities | 0 | - | 4.15 | 145,856 |
| Largest United States Airlines | 0 | - | 4.39 | 55,164 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,985 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,360 |
| U.S. States by Governor | 0 | - | 4.43 | 18,114 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,767 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,779 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,561 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,911 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,198 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,487 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,577 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,619 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,579 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,344 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,512 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,691 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,611 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,765 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 36,967 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,694 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,940 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,023 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,731 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,296 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,017 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,887 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,479 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,651 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,712 |
| California Groups of Things | 0 | - | 4.26 | 45,773 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,320 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,257 |
| New York Groups of Things | 0 | - | 4.39 | 72,146 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,930 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,785 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,065 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,569 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,835 |
| Flyover States | 0 | - | 4.53 | 29,600 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,265 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,411 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,467 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,190 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,565 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,402 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,305 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,689 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,767 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,989 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 65,012 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,340 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,449 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,681 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,041 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,828 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 77,044 |
| The Only American Country ... | 0 | - | 4.92 | 122,226 |
| American Countries with the Shortest Names | 0 | - | 4.97 | 121,687 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,898 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,835 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,956 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,825 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,881 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,019 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,075 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,274 |
| Old West History | 0 | - | 4.34 | 15,303 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,536 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,987 |
| Regions of U.S. States | 0 | - | 4.37 | 44,198 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,424 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,632 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,935 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,373 |
| Movies by State | 0 | - | 4.27 | 40,608 |
| Canada Country Quiz | 0 | - | 4.55 | 133,066 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,615 |
| Canada A-Z | 0 | - | 4.73 | 32,973 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,401 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,491 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,806 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,871 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,602 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,852 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,758 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.93 | 54,881 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,615 |
| States of Brazil | 0 | - | 4.97 | 89,740 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,235 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,516 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 95,037 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 83,033 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,083 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,089 |
| Geography of California | 0 | - | 4.26 | 10,629 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,713 |
| Chicago City Trivia | 0 | - | 4.31 | 31,521 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,963 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,857 |
