| Deadliest U.S. Wars | 0 | - | 4.89 | 190,355 |
| US States Quiz | 0 | - | 5.00 | 16,812,147 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,691 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,214 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,032 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,863 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,761 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,010 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,414 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,556 |
| Pixelated United States Map | 0 | - | 4.87 | 93,981 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,219 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,424 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,537 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,067 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,087 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,590 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,821 |
| U.S. States By Population | 0 | - | 4.92 | 152,923 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,080 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,269 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,061 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,065 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,394 |
| US States with an Empty Map | 0 | - | 5.00 | 622,360 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,057 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,031 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,397 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,277 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,524 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,292 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,589 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,754 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,236 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,372 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,266 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,706 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,770 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,859 |
| States of Mexico | 0 | - | 4.95 | 175,265 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,354 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 37,963 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,433 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,539 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,151 |
| United States Country Quiz | 0 | - | 4.43 | 101,213 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,801 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,683,455 |
| American Founding Fathers | 0 | - | 4.42 | 23,185 |
| People on Money - United States | 0 | - | 4.31 | 63,307 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,380 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,953 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,232 |
| Countries Closest to Canada | 0 | - | 4.91 | 197,915 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,858 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,032 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,508 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,869 |
| Names of Generations | 0 | - | 4.10 | 42,945 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,709 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,000 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,905 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,792 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,281 |
| New England States | 0 | - | 4.51 | 59,770 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,710 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,971 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,633 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,890 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,840 |
| U.S. States by Borders | 0 | - | 4.61 | 35,240 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 184,717 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,401 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,906 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,124 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,230 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,676 |
| United States Map Quiz | 0 | - | 4.98 | 4,150,990 |
| History of Pennsylvania | 0 | - | 4.16 | 7,119 |
| History of Virginia | 0 | - | 4.31 | 11,580 |
| Events in U.S. History | 0 | - | 4.40 | 28,597 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,825 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,672 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,417 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,132 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,010 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,727 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,666 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,844 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,299 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,453 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,723 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,340 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,273 |
| Flags of North and South America | 0 | - | 4.99 | 371,323 |
| Belize Country Quiz | 0 | - | 4.85 | 20,910 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,160 |
| Top U.S. Universities | 0 | - | 4.15 | 144,715 |
| Largest United States Airlines | 0 | - | 4.39 | 54,963 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,609 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,322 |
| U.S. States by Governor | 0 | - | 4.43 | 18,032 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,652 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,635 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,531 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,813 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,503 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,608 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,643 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,791 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,768 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,767 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,439 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,879 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,997 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,862 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,994 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,819 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,780 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,869 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,480 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,057 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,886 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,543 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,309 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,805 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,340 |
| California Groups of Things | 0 | - | 4.25 | 45,383 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,236 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,882 |
| New York Groups of Things | 0 | - | 4.37 | 62,276 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,762 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,502 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,843 |
| Flyover States | 0 | - | 4.52 | 29,468 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,054 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,044 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,294 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,057 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,467 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,848 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,922 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,439 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,576 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,220 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,660 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,753 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,230 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,453 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,635 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,651 |
| The Only American Country ... | 0 | - | 4.92 | 121,307 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,851 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,310 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,046 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,273 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,100 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,066 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,626 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,041 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,765 |
| Regions of U.S. States | 0 | - | 4.37 | 43,731 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,362 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,540 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,828 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,261 |
| Movies by State | 0 | - | 4.27 | 40,516 |
| Canada Country Quiz | 0 | - | 4.54 | 132,241 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,007 |
| Canada A-Z | 0 | - | 4.73 | 32,753 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,744 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,020 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,161 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,623 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,511 |
| 2017 News Stories - Name the Country | 0 | - | 4.46 | 28,473 |
| 2018 News Stories - Name the Country | 0 | - | 4.42 | 23,817 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,508 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,612 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,279 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,514 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,774 |
| States of Brazil | 0 | - | 4.97 | 87,384 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,182 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,407 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,306 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,411 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,027 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,023 |
| Geography of California | 0 | - | 4.26 | 10,541 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,673 |
| Chicago City Trivia | 0 | - | 4.31 | 31,428 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,869 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,801 |
| Washington State by Picture | 0 | - | 4.26 | 7,709 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,891 |
| A Superlative for Every U.S. State | 0 | - | 4.44 | 28,024 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 39,040 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,158 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,786 |
