| U.S. Cabinet Departments | 0 | - | 4.86 | 72,883 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,986 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,811 |
| U.S. States by Governor | 0 | - | 4.43 | 18,063 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,697 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,680 |
| US States Quiz | 0 | - | 5.00 | 16,877,957 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,957 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,662 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,521 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,087 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,238 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,084 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,659 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,669 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,911 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 332,085 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,364 |
| Pixelated United States Map | 0 | - | 4.87 | 94,280 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,696 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,777 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,879 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,438 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,448 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,023 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,310 |
| U.S. States By Population | 0 | - | 4.92 | 153,552 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,463 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,445 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,315 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,214 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,628 |
| US States with an Empty Map | 0 | - | 5.00 | 624,710 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,812 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,177 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,457 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,477 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,042 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,038 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,624 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,772 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,480 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,062 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,226 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,972 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,075 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,482 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,161 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,527 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,864 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,541 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,195 |
| States of Mexico | 0 | - | 4.96 | 176,147 |
| Mexico States Map Quiz | 0 | - | 4.84 | 104,749 |
| Top U.S. Universities | 0 | - | 4.15 | 145,149 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 48,240 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,663 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,282 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,537 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,634 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,752 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,303 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,773 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,702 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,026 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,554 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,527 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,586 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,180 |
| United States Country Quiz | 0 | - | 4.43 | 101,529 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,887 |
| Politicians with Other Careers | 0 | - | 3.98 | 15,018 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,712 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,699,272 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,060 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,393 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,363 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,984 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,426 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,870 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 747,202 |
| Most Guessed U.S. Cities | 0 | - | 4.89 | 106,046 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.83 | 72,824 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 209,498 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,675 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,890 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,350 |
| New England States | 0 | - | 4.51 | 59,811 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,820 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,012 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,822 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,011 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,932 |
| U.S. States by Borders | 0 | - | 4.61 | 35,318 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,352 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,104 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,484 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,043 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,228 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,104 |
| Countries that Beat Canada | 0 | - | 4.91 | 97,639 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,772 |
| United States Map Quiz | 0 | - | 4.98 | 4,158,745 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,534 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 52,932 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,804 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,485 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,189 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,044 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,798 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,827 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,876 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,235 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,817 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,499 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,775 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 113,858 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,309 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,993 |
| Flags of North and South America | 0 | - | 4.99 | 373,160 |
| Belize Country Quiz | 0 | - | 4.85 | 20,976 |
| Largest United States Airlines | 0 | - | 4.39 | 55,032 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,737 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,333 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,182 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,077 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,811 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,538 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,844 |
| Events in U.S. History | 0 | - | 4.41 | 28,673 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,778 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,090 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,098 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,095 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,788 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 53,875 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,333 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,142 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,308 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,133 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,917 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,564 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,144 |
| American Political Words | 0 | - | 4.39 | 23,423 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,655 |
| American Founding Fathers | 0 | - | 4.42 | 23,226 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,449 |
| California Groups of Things | 0 | - | 4.25 | 45,493 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,264 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,974 |
| New York Groups of Things | 0 | - | 4.35 | 63,726 |
| People on Money - United States | 0 | - | 4.31 | 63,348 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,468 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,854 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,524 |
| Flyover States | 0 | - | 4.52 | 29,515 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,125 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,168 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,502 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,023 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,039 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,382 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,521 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,368 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,991 |
| The Only American Country ... | 0 | - | 4.92 | 121,624 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,131 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,485 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,480 |
| Names of Generations | 0 | - | 4.09 | 44,933 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,833 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,079 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,054 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,947 |
| Regions of U.S. States | 0 | - | 4.37 | 43,884 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,388 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,573 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,851 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,296 |
| Movies by State | 0 | - | 4.27 | 40,543 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,148 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,137 |
| Canada Country Quiz | 0 | - | 4.54 | 132,494 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,220 |
| Canada A-Z | 0 | - | 4.73 | 32,838 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,150 |
| Monarchies of Europe | 0 | - | 4.90 | 98,165 |
| Monarchies of Asia | 0 | - | 4.97 | 71,095 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,899 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,619 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,369 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,430 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,933 |
| Brazil States Map Quiz | 0 | - | 4.85 | 48,083 |
| States of Brazil | 0 | - | 4.97 | 88,131 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,198 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,444 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.55 | 138,368 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,846 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,808 |
