| U.S. Cabinet Departments | 0 | - | 4.86 | 72,795 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,917 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,485 |
| U.S. States by Governor | 0 | - | 4.43 | 18,039 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,666 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,647 |
| US States Quiz | 0 | - | 5.00 | 16,828,830 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,773 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,307 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,172 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 243,152 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,066 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,558 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,462 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,384 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,832 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,992 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,322 |
| Pixelated United States Map | 0 | - | 4.87 | 94,057 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,322 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,501 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,629 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,149 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,191 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,674 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,949 |
| U.S. States By Population | 0 | - | 4.92 | 152,992 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,174 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,306 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,113 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,098 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,448 |
| US States with an Empty Map | 0 | - | 5.00 | 623,185 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,623 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,095 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,123 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,514 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,029 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,025 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,366 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,590 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,334 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,701 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,868 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,395 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,792 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,148 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,135 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,503 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,853 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,418 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,893 |
| States of Mexico | 0 | - | 4.95 | 175,464 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,445 |
| Top U.S. Universities | 0 | - | 4.15 | 144,829 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,966 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,576 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,912 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,466 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,592 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,685 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,252 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,674 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,666 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 83,381 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,284 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,458 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,553 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,158 |
| United States Country Quiz | 0 | - | 4.43 | 101,294 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,818 |
| Politicians with Other Careers | 0 | - | 3.98 | 15,011 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,706 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,687,476 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,986 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,252 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,007 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,883 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,272 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,771 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 746,153 |
| Most Guessed U.S. Cities | 0 | - | 4.89 | 105,736 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.83 | 72,647 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,825 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,669 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,820 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,295 |
| New England States | 0 | - | 4.51 | 59,781 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,742 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,980 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,683 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,910 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,866 |
| U.S. States by Borders | 0 | - | 4.61 | 35,256 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,311 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,070 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,425 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,936 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,170 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,014 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,279 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,706 |
| United States Map Quiz | 0 | - | 4.98 | 4,153,654 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,500 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,842 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,698 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,432 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,143 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,021 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,741 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,706 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,851 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,178 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,795 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,464 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,731 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,388 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,290 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,938 |
| Flags of North and South America | 0 | - | 4.99 | 371,804 |
| Belize Country Quiz | 0 | - | 4.85 | 20,929 |
| Largest United States Airlines | 0 | - | 4.39 | 54,990 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,644 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,327 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,967 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,062 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,752 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,806 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,822 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,670 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,973 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,957 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 56,966 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,649 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 52,904 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,227 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,024 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,195 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,996 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,881 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,501 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,080 |
| American Political Words | 0 | - | 4.39 | 23,395 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,057 |
| American Founding Fathers | 0 | - | 4.42 | 23,200 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,369 |
| California Groups of Things | 0 | - | 4.25 | 45,414 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,246 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,907 |
| New York Groups of Things | 0 | - | 4.38 | 62,956 |
| People on Money - United States | 0 | - | 4.31 | 63,319 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,404 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,780 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,505 |
| Flyover States | 0 | - | 4.52 | 29,477 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,076 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,065 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,474 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,889 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,948 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,270 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,471 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,312 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,914 |
| The Only American Country ... | 0 | - | 4.92 | 121,387 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,912 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,349 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,318 |
| Names of Generations | 0 | - | 4.10 | 44,063 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,302 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,723 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,045 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,810 |
| Regions of U.S. States | 0 | - | 4.37 | 43,782 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,369 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,549 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,832 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,270 |
| Movies by State | 0 | - | 4.27 | 40,524 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,125 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,108 |
| Canada Country Quiz | 0 | - | 4.54 | 132,312 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,049 |
| Canada A-Z | 0 | - | 4.73 | 32,772 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,885 |
| Monarchies of Europe | 0 | - | 4.90 | 97,937 |
| Monarchies of Asia | 0 | - | 4.97 | 70,967 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,770 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,303 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,057 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,322 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,636 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,850 |
| States of Brazil | 0 | - | 4.97 | 87,608 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,189 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,415 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.55 | 138,211 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,451 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,517 |
| Richest Metro Areas in the U.S. | 0 | - | 4.42 | 43,609 |
