| Deadliest U.S. Wars | 0 | - | 4.89 | 189,684 |
| US States Quiz | 0 | - | 5.00 | 16,769,204 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,517 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,969 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,680 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,073 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,657 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,868 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,048 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,507 |
| Pixelated United States Map | 0 | - | 4.89 | 93,774 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,933 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,196 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,281 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,866 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,860 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,288 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,520 |
| U.S. States By Population | 0 | - | 4.92 | 152,739 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,841 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,143 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,901 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,959 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,220 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,703 |
| US States with an Empty Map | 0 | - | 5.00 | 621,070 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,924 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,778 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,072 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,030 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,362 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,168 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,241 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,434 |
| American Founding Fathers | 0 | - | 4.42 | 23,099 |
| People on Money - United States | 0 | - | 4.31 | 63,256 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,328 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,804 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,486 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,178 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,034 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,460 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,675 |
| States of Mexico | 0 | - | 4.95 | 174,444 |
| Mexico States Map Quiz | 0 | - | 4.84 | 104,128 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,377 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,513 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,120 |
| United States Country Quiz | 0 | - | 4.43 | 100,979 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,711 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,754 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,162 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,673 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,778 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,956 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,442 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 744,914 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,374 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,899 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,833 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,709 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,240 |
| New England States | 0 | - | 4.51 | 59,752 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,616 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,942 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,537 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,801 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,774 |
| U.S. States by Borders | 0 | - | 4.63 | 35,179 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 183,724 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,353 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,776 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,075 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,088 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,590 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,482 |
| History of Pennsylvania | 0 | - | 4.16 | 7,107 |
| History of Virginia | 0 | - | 4.31 | 11,572 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,760 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,568 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,358 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,098 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,969 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,683 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,561 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,813 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,429 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,700 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,219 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,263 |
| Flags of North and South America | 0 | - | 4.99 | 369,746 |
| Belize Country Quiz | 0 | - | 4.85 | 20,868 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,108 |
| Top U.S. Universities | 0 | - | 4.15 | 144,465 |
| Largest United States Airlines | 0 | - | 4.39 | 54,913 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,514 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,316 |
| U.S. States by Governor | 0 | - | 4.43 | 18,011 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,611 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,597 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,848 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,784 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,202 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,573 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,722 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,692 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,682 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,356 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,802 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,940 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,790 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,922 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,710 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,730 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,837 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,426 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,002 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,530 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,481 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,252 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,264 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,272 |
| California Groups of Things | 0 | - | 4.25 | 45,332 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,220 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,815 |
| New York Groups of Things | 0 | - | 4.38 | 60,013 |
| The American Civil War | 0 | - | 4.62 | 52,260 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,705 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,485 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,560 |
| Flyover States | 0 | - | 4.52 | 29,442 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,000 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,954 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,259 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 37,017 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,444 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,671 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,826 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,369 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,536 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,144 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,584 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,691 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,178 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,396 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,551 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,623 |
| The Only American Country ... | 0 | - | 4.92 | 121,126 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,693 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,175 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,755 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,127 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,593 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,905 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,389 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,033 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,658 |
| American History Quotes #1 | 0 | - | 4.37 | 95,784 |
| American History Quotes #2 | 0 | - | 4.38 | 41,267 |
| Regions of U.S. States | 0 | - | 4.37 | 43,631 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,356 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,518 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,810 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,239 |
| Movies by State | 0 | - | 4.27 | 40,484 |
| Canada Country Quiz | 0 | - | 4.55 | 132,028 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,832 |
| Canada A-Z | 0 | - | 4.73 | 32,715 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,471 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,799 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,904 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,444 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,259 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,406 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,158 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,371 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,325 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,603 |
| States of Brazil | 0 | - | 4.97 | 87,009 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,169 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,388 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 92,929 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,185 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,013 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,011 |
| Geography of California | 0 | - | 4.25 | 10,524 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,663 |
| Chicago City Trivia | 0 | - | 4.31 | 31,407 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,833 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,793 |
| Washington State by Picture | 0 | - | 4.26 | 7,702 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,868 |
| A Superlative for Every U.S. State | 0 | - | 4.44 | 27,981 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 38,997 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,104 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,772 |
| U.S. States with the Most Venomous Snake Species | 0 | - | 4.47 | 26,352 |
| U.S. States with the Most Endangered Species | 0 | - | 4.50 | 14,336 |
| African-American Historical Figures | 0 | - | 4.18 | 17,152 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,249 |
