| Deadliest U.S. Wars | 0 | - | 4.89 | 191,833 |
| US States Quiz | 0 | - | 5.00 | 17,003,583 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,516 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,452 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,597 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 246,647 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,122 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,753 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,734 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 335,645 |
| Pixelated United States Map | 0 | - | 4.88 | 94,840 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,604 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,476 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,106 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,321 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,344 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,392 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,419 |
| U.S. States By Population | 0 | - | 4.92 | 154,183 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,272 |
| U.S. States with Longest Names | 0 | - | 4.85 | 44,919 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,890 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,554 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,133 |
| Events in U.S. History | 0 | - | 4.41 | 28,832 |
| US States with an Empty Map | 0 | - | 5.00 | 628,980 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,410 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,272 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,728 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,348 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,504 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,058 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,224 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,440 |
| People on Money - United States | 0 | - | 4.31 | 63,437 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,593 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,619 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,910 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,565 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,897 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,233 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,434 |
| States of Mexico | 0 | - | 4.96 | 178,371 |
| Mexico States Map Quiz | 0 | - | 4.85 | 105,692 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,176 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,828 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,757 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,680 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,284 |
| United States Country Quiz | 0 | - | 4.43 | 102,239 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,077 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,727,335 |
| American Founding Fathers | 0 | - | 4.42 | 23,274 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,234 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,605 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,633 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,528 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,220 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,069 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 57,993 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 749,937 |
| Names of Generations | 0 | - | 4.09 | 45,545 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,574 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,448 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,158 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,129 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,540 |
| New England States | 0 | - | 4.51 | 59,903 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,072 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,125 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,173 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,296 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,156 |
| U.S. States by Borders | 0 | - | 4.62 | 35,491 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 188,973 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,690 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,353 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,456 |
| Countries that Beat Canada | 0 | - | 4.90 | 99,032 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,975 |
| United States Map Quiz | 0 | - | 4.98 | 4,172,040 |
| History of Pennsylvania | 0 | - | 4.16 | 7,168 |
| History of Virginia | 0 | - | 4.33 | 11,643 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,156 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,113 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,661 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.70 | 61,141 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,122 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,959 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,154 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,988 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.44 | 70,646 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.74 | 64,215 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,576 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,839 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,238 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,373 |
| Flags of North and South America | 0 | - | 4.99 | 377,324 |
| Belize Country Quiz | 0 | - | 4.85 | 21,102 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,306 |
| Top U.S. Universities | 0 | - | 4.15 | 145,878 |
| Largest United States Airlines | 0 | - | 4.39 | 55,167 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,995 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,362 |
| U.S. States by Governor | 0 | - | 4.43 | 18,115 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,771 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,784 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,620 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,911 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,203 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,542 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,626 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,668 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,627 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,400 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,557 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,735 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,666 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,810 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 37,016 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,741 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,944 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,025 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,739 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,301 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,027 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,894 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,481 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,685 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,722 |
| California Groups of Things | 0 | - | 4.26 | 45,778 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,320 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,261 |
| New York Groups of Things | 0 | - | 4.39 | 72,185 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,930 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,787 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,068 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,573 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,845 |
| Flyover States | 0 | - | 4.53 | 29,602 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,278 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,419 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,467 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,191 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,569 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,410 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,315 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,691 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,768 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,996 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 65,017 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,347 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,456 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,688 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,046 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,829 |
| Georgia ... or Georgia? | 0 | - | 4.68 | 77,051 |
| The Only American Country ... | 0 | - | 4.92 | 122,244 |
| American Countries with the Shortest Names | 0 | - | 4.97 | 121,694 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,908 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,856 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,977 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,864 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,896 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,055 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,076 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,285 |
| Old West History | 0 | - | 4.34 | 15,306 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,536 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,988 |
| Regions of U.S. States | 0 | - | 4.37 | 44,211 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,425 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,634 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,937 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,376 |
| Movies by State | 0 | - | 4.27 | 40,611 |
| Canada Country Quiz | 0 | - | 4.55 | 133,081 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,627 |
| Canada A-Z | 0 | - | 4.73 | 32,977 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,427 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,613 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,854 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,900 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,623 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,873 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,773 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.93 | 54,916 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,647 |
| States of Brazil | 0 | - | 4.97 | 89,808 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,235 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,518 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 95,089 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 83,143 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,085 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,091 |
| Geography of California | 0 | - | 4.26 | 10,630 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,714 |
| Chicago City Trivia | 0 | - | 4.31 | 31,521 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,964 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,859 |
