| U.S. Cabinet Departments | 0 | - | 4.86 | 72,726 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,874 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,179 |
| U.S. States by Governor | 0 | - | 4.43 | 18,026 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,634 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,619 |
| US States Quiz | 0 | - | 5.00 | 16,796,297 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,634 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,141 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,907 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,589 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,960 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,271 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,308 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,185 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,745 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,245 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,293 |
| Pixelated United States Map | 0 | - | 4.89 | 93,895 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,113 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,349 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,457 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,002 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,012 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,488 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,699 |
| U.S. States By Population | 0 | - | 4.92 | 152,858 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,992 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,220 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,021 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,027 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,346 |
| US States with an Empty Map | 0 | - | 5.00 | 621,887 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,019 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,956 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,279 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,021 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,022 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,193 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,470 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,247 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,485 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,646 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,061 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,635 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,943 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,127 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,496 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,847 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,325 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,536 |
| States of Mexico | 0 | - | 4.95 | 175,008 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,273 |
| Top U.S. Universities | 0 | - | 4.15 | 144,617 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,791 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,528 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,740 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,416 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,560 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,629 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,207 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,600 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,639 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 82,415 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,416 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,530 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,145 |
| United States Country Quiz | 0 | - | 4.43 | 101,142 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,780 |
| Politicians with Other Careers | 0 | - | 3.98 | 15,007 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,701 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,678,919 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,911 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,212 |
| Countries Closest to Canada | 0 | - | 4.91 | 197,834 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,826 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,010 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,491 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,536 |
| Most Guessed U.S. Cities | 0 | - | 4.89 | 105,556 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.84 | 72,490 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,576 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,667 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,772 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,262 |
| New England States | 0 | - | 4.51 | 59,764 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,680 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,959 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,600 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,863 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,816 |
| U.S. States by Borders | 0 | - | 4.61 | 35,221 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,284 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,044 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,381 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,870 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,105 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,734 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,174 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,656 |
| United States Map Quiz | 0 | - | 4.98 | 4,149,786 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,479 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,796 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,637 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,394 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,122 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,988 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,716 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,627 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,837 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,140 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,782 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,443 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,714 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,297 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,269 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,912 |
| Flags of North and South America | 0 | - | 4.99 | 370,782 |
| Belize Country Quiz | 0 | - | 4.85 | 20,898 |
| Largest United States Airlines | 0 | - | 4.39 | 54,944 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,583 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,320 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,853 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,032 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,726 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,311 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,804 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,615 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,767 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,739 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,737 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,409 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,854 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,969 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,832 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,967 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,780 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,854 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,462 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,033 |
| American Political Words | 0 | - | 4.39 | 23,389 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,575 |
| American Founding Fathers | 0 | - | 4.42 | 23,159 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,316 |
| California Groups of Things | 0 | - | 4.25 | 45,347 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,229 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,858 |
| New York Groups of Things | 0 | - | 4.38 | 60,036 |
| People on Money - United States | 0 | - | 4.31 | 63,289 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,356 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,735 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,499 |
| Flyover States | 0 | - | 4.52 | 29,460 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,030 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,011 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,459 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,794 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,886 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,189 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,434 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,247 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,872 |
| The Only American Country ... | 0 | - | 4.92 | 121,242 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,792 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,261 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,227 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,911 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,547 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,040 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,731 |
| Regions of U.S. States | 0 | - | 4.37 | 43,695 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,360 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,529 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,817 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,253 |
| Movies by State | 0 | - | 4.27 | 40,507 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,110 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,096 |
| Canada Country Quiz | 0 | - | 4.54 | 132,160 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,946 |
| Canada A-Z | 0 | - | 4.73 | 32,739 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,673 |
| Monarchies of Europe | 0 | - | 4.90 | 97,770 |
| Monarchies of Asia | 0 | - | 4.97 | 70,877 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,690 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,852 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,877 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,249 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 36,511 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,456 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,726 |
| States of Brazil | 0 | - | 4.97 | 87,285 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,176 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,399 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.55 | 138,122 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,171 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,339 |
| Richest Metro Areas in the U.S. | 0 | - | 4.42 | 43,497 |
| Geography of California | 0 | - | 4.26 | 10,536 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,671 |
