| U.S. Cabinet Departments | 0 | - | 4.86 | 72,679 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,845 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,764 |
| U.S. States by Governor | 0 | - | 4.43 | 18,015 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,620 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,604 |
| US States Quiz | 0 | - | 5.00 | 16,777,193 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,556 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,023 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,742 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,225 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,894 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,114 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,213 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,079 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,686 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,752 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,258 |
| Pixelated United States Map | 0 | - | 4.89 | 93,806 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,989 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,237 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,337 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,914 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,907 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,341 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,575 |
| U.S. States By Population | 0 | - | 4.92 | 152,780 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,880 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,160 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,949 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,973 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,252 |
| US States with an Empty Map | 0 | - | 5.00 | 621,309 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,941 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,812 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,121 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,016 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,013 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,073 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,399 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,197 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,311 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,492 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,660 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,505 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,811 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,115 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,490 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,833 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,270 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,452 |
| States of Mexico | 0 | - | 4.95 | 174,632 |
| Mexico States Map Quiz | 0 | - | 4.84 | 104,177 |
| Top U.S. Universities | 0 | - | 4.15 | 144,507 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,631 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,498 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,618 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,382 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,544 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,594 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,188 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,562 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,624 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 81,830 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,385 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,516 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,126 |
| United States Country Quiz | 0 | - | 4.43 | 101,025 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,722 |
| Politicians with Other Careers | 0 | - | 3.98 | 15,004 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,696 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,673,427 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,824 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,175 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,717 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,786 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,970 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,459 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,145 |
| Most Guessed U.S. Cities | 0 | - | 4.89 | 105,427 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.84 | 72,397 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,436 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,663 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,723 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,246 |
| New England States | 0 | - | 4.51 | 59,755 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,630 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,948 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,556 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,816 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,787 |
| U.S. States by Borders | 0 | - | 4.63 | 35,189 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,264 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 37,024 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,360 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,809 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,079 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,702 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,113 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,606 |
| United States Map Quiz | 0 | - | 4.98 | 4,148,281 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,425 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,773 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,589 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,362 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,103 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,976 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,694 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,585 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,819 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,107 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,773 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,438 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,703 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,236 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,264 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,888 |
| Flags of North and South America | 0 | - | 4.99 | 370,076 |
| Belize Country Quiz | 0 | - | 4.85 | 20,877 |
| Largest United States Airlines | 0 | - | 4.39 | 54,923 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,534 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,316 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,780 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,975 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,706 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,954 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,787 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,582 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,737 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,707 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,697 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,381 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,816 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,947 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,799 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,938 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,739 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,840 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,435 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,011 |
| American Political Words | 0 | - | 4.39 | 23,376 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,353 |
| American Founding Fathers | 0 | - | 4.42 | 23,110 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,283 |
| California Groups of Things | 0 | - | 4.25 | 45,337 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,224 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,827 |
| New York Groups of Things | 0 | - | 4.38 | 60,020 |
| People on Money - United States | 0 | - | 4.31 | 63,262 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,336 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,717 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,493 |
| Flyover States | 0 | - | 4.52 | 29,445 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,013 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,965 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,448 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,700 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,846 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,151 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,403 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,220 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,846 |
| The Only American Country ... | 0 | - | 4.92 | 121,161 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,719 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,198 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,159 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,672 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,442 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,037 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,686 |
| Regions of U.S. States | 0 | - | 4.37 | 43,648 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,358 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,519 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,811 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,241 |
| Movies by State | 0 | - | 4.27 | 40,491 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,101 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,082 |
| Canada Country Quiz | 0 | - | 4.54 | 132,069 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,863 |
| Canada A-Z | 0 | - | 4.73 | 32,717 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,581 |
| Monarchies of Europe | 0 | - | 4.90 | 97,690 |
| Monarchies of Asia | 0 | - | 4.97 | 70,825 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,623 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,757 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,671 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,184 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,376 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,368 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,651 |
| States of Brazil | 0 | - | 4.97 | 87,131 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,169 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,390 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.55 | 138,069 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,000 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,226 |
| Richest Metro Areas in the U.S. | 0 | - | 4.42 | 43,437 |
| Geography of California | 0 | - | 4.25 | 10,531 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,664 |
