| Deadliest U.S. Wars | 0 | - | 4.89 | 189,158 |
| US States Quiz | 0 | - | 5.00 | 16,684,489 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,401 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,566 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,063 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,085 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,492 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,560 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,129 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,662 |
| Pixelated United States Map | 0 | - | 4.89 | 93,387 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,338 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,757 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,622 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,267 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,319 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,542 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,804 |
| U.S. States By Population | 0 | - | 4.92 | 152,289 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,296 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,796 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,470 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,726 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,805 |
| US States with an Empty Map | 0 | - | 5.00 | 618,315 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,778 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,308 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,423 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,485 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,009 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,887 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,586 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,819 |
| People on Money - United States | 0 | - | 4.31 | 63,199 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,223 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,508 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,797 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,573 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 90,966 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,518 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,421 |
| States of Mexico | 0 | - | 4.95 | 173,143 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,703 |
| Events in U.S. History | 0 | - | 4.40 | 28,456 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,238 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,462 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,069 |
| United States Country Quiz | 0 | - | 4.43 | 100,496 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,584 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,041 |
| American Founding Fathers | 0 | - | 4.41 | 23,065 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,705 |
| The Life of Thomas Edison | 0 | - | 4.03 | 4,891 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,436 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,274 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,614 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,511 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,060 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 742,857 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 207,728 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,672 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,717 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,568 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,186 |
| New England States | 0 | - | 4.51 | 59,700 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,440 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,878 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,276 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,601 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,643 |
| U.S. States by Borders | 0 | - | 4.63 | 35,051 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 182,328 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,215 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,097 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 43,971 |
| Countries that Beat Canada | 0 | - | 4.90 | 86,805 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,487 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,177 |
| History of Pennsylvania | 0 | - | 4.16 | 7,085 |
| History of Virginia | 0 | - | 4.31 | 11,554 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,631 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,363 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,261 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,016 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,924 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,551 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,343 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,757 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,382 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,656 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 112,981 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,221 |
| Flags of North and South America | 0 | - | 4.99 | 366,065 |
| Belize Country Quiz | 0 | - | 4.85 | 20,785 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,034 |
| Top U.S. Universities | 0 | - | 4.15 | 143,961 |
| Largest United States Airlines | 0 | - | 4.39 | 54,820 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,349 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,299 |
| U.S. States by Governor | 0 | - | 4.43 | 17,976 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,563 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,533 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,404 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,746 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 32,981 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,209 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,374 |
| U.S. Geography by Letter - C | 0 | - | 4.26 | 73,317 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,279 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,283 |
| U.S. Geography by Letter - T | 0 | - | 4.27 | 48,968 |
| U.S. Geography by Letter - P | 0 | - | 4.34 | 47,360 |
| U.S. Geography by Letter - M | 0 | - | 4.13 | 52,576 |
| U.S. Geography by Letter - L | 0 | - | 4.03 | 40,328 |
| U.S. Geography by Letter - G | 0 | - | 4.12 | 38,576 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,299 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,651 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,780 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,330 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,919 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.49 | 37,101 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,319 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,145 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,402 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,107 |
| California Groups of Things | 0 | - | 4.25 | 45,256 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,200 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,666 |
| New York Groups of Things | 0 | - | 4.38 | 59,917 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,636 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,581 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,456 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.45 | 49,731 |
| Flyover States | 0 | - | 4.52 | 29,377 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,894 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,770 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,180 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,957 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,406 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,416 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,656 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,249 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,458 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 127,968 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,395 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,539 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,061 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,296 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,373 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,551 |
| The Only American Country ... | 0 | - | 4.92 | 120,680 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,279 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,884 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,215 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,791 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,659 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,625 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 72,997 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,017 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,447 |
| Old West History | 0 | - | 4.33 | 15,218 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,486 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,842 |
| Regions of U.S. States | 0 | - | 4.37 | 43,430 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,336 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,481 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,757 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,190 |
| Movies by State | 0 | - | 4.27 | 40,435 |
| Canada Country Quiz | 0 | - | 4.54 | 131,650 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,568 |
| Canada A-Z | 0 | - | 4.73 | 32,634 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,819 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,321 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,273 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,015 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,933 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,741 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,021 |
| Mexico Country Quiz | 0 | - | 4.49 | 71,940 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,306 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 52,825 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,352 |
| States of Brazil | 0 | - | 4.98 | 86,252 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,154 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,352 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 92,150 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 80,626 |
| Senators Who Ran For President | 0 | - | 4.24 | 16,987 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 21,965 |
| Geography of California | 0 | - | 4.25 | 10,494 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,647 |
| Chicago City Trivia | 0 | - | 4.31 | 31,372 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,791 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,771 |
| Washington State by Picture | 0 | - | 4.26 | 7,680 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,827 |
| A Superlative for Every U.S. State | 0 | - | 4.44 | 27,891 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 38,915 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 37,984 |
