| U.S. Cabinet Departments | 0 | - | 4.86 | 72,568 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,776 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,422 |
| U.S. States by Governor | 0 | - | 4.43 | 17,992 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,591 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,563 |
| US States Quiz | 0 | - | 5.00 | 16,726,304 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,269 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,768 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,362 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 241,328 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,717 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,514 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,004 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,817 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,602 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,670 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,198 |
| Pixelated United States Map | 0 | - | 4.89 | 93,598 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,635 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,968 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,886 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,506 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,555 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,843 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,095 |
| U.S. States By Population | 0 | - | 4.92 | 152,496 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,541 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,959 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,677 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,812 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,981 |
| US States with an Empty Map | 0 | - | 5.00 | 619,631 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,846 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,554 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,739 |
| Senators Who Ran For President | 0 | - | 4.24 | 16,997 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 21,993 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,723 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,178 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,008 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 94,911 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,118 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,005 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,214 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,478 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,083 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,470 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,822 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,147 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,173 |
| States of Mexico | 0 | - | 4.95 | 173,753 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,948 |
| Top U.S. Universities | 0 | - | 4.15 | 144,225 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 40,815 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,399 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 53,014 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,306 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,499 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,485 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,122 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,461 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,589 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,173 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,323 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,488 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,095 |
| United States Country Quiz | 0 | - | 4.43 | 100,735 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,651 |
| Politicians with Other Careers | 0 | - | 3.98 | 14,992 |
| Main Parts of the U.S. Budget | 0 | - | 3.45 | 8,683 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,660,810 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,758 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,483 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,695 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,831 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,341 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,714 |
| Most Guessed U.S. Cities | 0 | - | 4.88 | 105,131 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.84 | 72,178 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,052 |
| Children of U.S. Presidents | 0 | - | 3.95 | 16,652 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,640 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,212 |
| New England States | 0 | - | 4.51 | 59,716 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,530 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,900 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,394 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,698 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,691 |
| U.S. States by Borders | 0 | - | 4.63 | 35,111 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,222 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,990 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,269 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,181 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,021 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,606 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,552 |
| United States Map Quiz | 0 | - | 4.98 | 4,143,946 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,387 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,690 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,472 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,304 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,051 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,944 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,619 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,443 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,788 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,057 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,748 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,406 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,681 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,113 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,238 |
| U.S. States With No City Over 100,000 | 0 | - | 4.57 | 17,835 |
| Flags of North and South America | 0 | - | 4.99 | 368,268 |
| Belize Country Quiz | 0 | - | 4.85 | 20,830 |
| Largest United States Airlines | 0 | - | 4.39 | 54,865 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,422 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,307 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,523 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,895 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,676 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,147 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,768 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,477 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,604 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,575 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,566 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,242 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,663 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,846 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,661 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,809 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,573 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,804 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,379 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,964 |
| American Political Words | 0 | - | 4.39 | 23,348 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,844 |
| American Founding Fathers | 0 | - | 4.41 | 23,085 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,182 |
| California Groups of Things | 0 | - | 4.25 | 45,293 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,209 |
| New York Groups of Things | 0 | - | 4.38 | 59,969 |
| People on Money - United States | 0 | - | 4.31 | 63,226 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,276 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,643 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,470 |
| Flyover States | 0 | - | 4.52 | 29,418 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,956 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,867 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,428 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,550 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,746 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,038 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,351 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,165 |
| European Secessionist Movements on a Map | 0 | - | 4.53 | 34,782 |
| The Only American Country ... | 0 | - | 4.92 | 120,878 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,432 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,029 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,963 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,130 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,164 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,025 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,563 |
| Regions of U.S. States | 0 | - | 4.37 | 43,534 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,346 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,504 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,781 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,215 |
| Movies by State | 0 | - | 4.27 | 40,455 |
| U.S. States with the Fewest Traffic Fatalities | 0 | - | 4.20 | 21,074 |
| U.S. States with the Most Traffic Fatalities | 0 | - | 4.10 | 19,056 |
| Canada Country Quiz | 0 | - | 4.55 | 131,845 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,703 |
| Canada A-Z | 0 | - | 4.73 | 32,675 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,334 |
| Monarchies of Europe | 0 | - | 4.90 | 97,451 |
| Monarchies of Asia | 0 | - | 4.97 | 70,668 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,490 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,455 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,218 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,054 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,329 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,111 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,488 |
| States of Brazil | 0 | - | 4.98 | 86,623 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,163 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,371 |
| U.S. Cities with the Highest Murder Rate | 0 | - | 4.54 | 137,875 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 92,592 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 80,925 |
| Richest Metro Areas in the U.S. | 0 | - | 4.42 | 43,281 |
| Geography of California | 0 | - | 4.25 | 10,510 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,652 |
| Chicago City Trivia | 0 | - | 4.31 | 31,393 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,814 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,785 |
