| U.S. Cabinet Departments | 0 | - | 4.86 | 72,476 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,703 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,109 |
| U.S. States by Governor | 0 | - | 4.43 | 17,971 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,552 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,524 |
| US States Quiz | 0 | - | 5.00 | 16,676,688 |
| Name the U.S. National Parks | 0 | - | 4.85 | 57,330 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,500 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,018 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 239,915 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,515 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,034 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,775 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,543 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,504 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,498 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,132 |
| Pixelated United States Map | 0 | - | 4.89 | 93,272 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,262 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,701 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,564 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,195 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,255 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,468 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,732 |
| U.S. States By Population | 0 | - | 4.92 | 152,242 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,233 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,763 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,436 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,699 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,778 |
| US States with an Empty Map | 0 | - | 5.00 | 618,048 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,755 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,257 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,368 |
| Senators Who Ran For President | 0 | - | 4.23 | 16,985 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 21,961 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,440 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 100,953 |
| U.S. States with the Most Immigrants | 0 | - | 4.84 | 81,853 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,522 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,769 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,418 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 90,925 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,138 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,062 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,451 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,800 |
| Canadian Prime Ministers | 0 | - | 4.63 | 56,960 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 90,992 |
| States of Mexico | 0 | - | 4.95 | 172,999 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,664 |
| Top U.S. Universities | 0 | - | 4.15 | 143,900 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.49 | 37,077 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,308 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.45 | 49,725 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,235 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,452 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,375 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,051 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,352 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,543 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,037 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,229 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,452 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,059 |
| United States Country Quiz | 0 | - | 4.43 | 100,453 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,569 |
| Politicians with Other Careers | 0 | - | 3.98 | 14,981 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,672 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,648,112 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,695 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,220 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,589 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,493 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,048 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 742,718 |
| Most Guessed U.S. Cities | 0 | - | 4.88 | 104,675 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.83 | 71,929 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 207,650 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,640 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,545 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,177 |
| New England States | 0 | - | 4.51 | 59,695 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,413 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,872 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,251 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,588 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,630 |
| U.S. States by Borders | 0 | - | 4.63 | 35,042 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,171 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,951 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,206 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,079 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 43,961 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,526 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,479 |
| United States Map Quiz | 0 | - | 4.98 | 4,139,440 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,364 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,618 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,343 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,251 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,010 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,920 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,546 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,315 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,753 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 37,973 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,721 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,379 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,650 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 112,958 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,217 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,794 |
| Flags of North and South America | 0 | - | 4.99 | 365,320 |
| Belize Country Quiz | 0 | - | 4.85 | 20,778 |
| Largest United States Airlines | 0 | - | 4.39 | 54,811 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,331 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,298 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,301 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,868 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,660 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,219 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,742 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,359 |
| U.S. Geography by Letter - C | 0 | - | 4.26 | 73,298 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,260 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,262 |
| U.S. Geography by Letter - T | 0 | - | 4.27 | 48,956 |
| U.S. Geography by Letter - P | 0 | - | 4.34 | 47,339 |
| U.S. Geography by Letter - M | 0 | - | 4.13 | 52,561 |
| U.S. Geography by Letter - L | 0 | - | 4.03 | 40,312 |
| U.S. Geography by Letter - G | 0 | - | 4.12 | 38,564 |
| U.S. Geography By Letter - H | 0 | - | 4.38 | 39,278 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,776 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,322 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,913 |
| American Political Words | 0 | - | 4.39 | 23,327 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,313 |
| American Founding Fathers | 0 | - | 4.41 | 23,061 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,086 |
| California Groups of Things | 0 | - | 4.25 | 45,243 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,199 |
| New York Groups of Things | 0 | - | 4.38 | 59,909 |
| People on Money - United States | 0 | - | 4.31 | 63,195 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,214 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,564 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,449 |
| Flyover States | 0 | - | 4.52 | 29,374 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,886 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,762 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,403 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,393 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,644 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 127,951 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,290 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,087 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,714 |
| The Only American Country ... | 0 | - | 4.92 | 120,644 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,242 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,825 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,732 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,579 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 72,965 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,016 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,421 |
| Regions of U.S. States | 0 | - | 4.37 | 43,401 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,333 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,476 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,753 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,188 |
| Movies by State | 0 | - | 4.27 | 40,435 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,046 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,033 |
| Canada Country Quiz | 0 | - | 4.54 | 131,619 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,550 |
| Canada A-Z | 0 | - | 4.73 | 32,621 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,102 |
| Monarchies of Europe | 0 | - | 4.90 | 97,194 |
| Monarchies of Asia | 0 | - | 4.97 | 70,530 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,375 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,281 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 90,952 |
| Mexico Country Quiz | 0 | - | 4.49 | 71,919 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,300 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 52,756 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,310 |
| States of Brazil | 0 | - | 4.98 | 86,177 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,153 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,349 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.55 | 137,582 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 92,037 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 80,567 |
| Richest Metro Areas in the U.S. | 0 | - | 4.42 | 43,102 |
| Geography of California | 0 | - | 4.25 | 10,492 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,644 |
| Chicago City Trivia | 0 | - | 4.31 | 31,365 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,783 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,770 |
