| Deadliest U.S. Wars | 0 | - | 4.83 | 159,347 |
| US States Quiz | 0 | - | 5.00 | 14,911,014 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.84 | 55,462 |
| Total United States Immigration by Country | 0 | - | 4.89 | 97,599 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.93 | 148,517 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.94 | 187,599 |
| U.S. Cabinet Departments | 0 | - | 4.85 | 67,973 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.97 | 342,217 |
| Pixelated United States Map | 0 | - | 4.90 | 83,074 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 94,617 |
| Countries that Visit the United States the Most | 0 | - | 4.95 | 79,744 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 101,474 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 97,324 |
| 10 Southernmost U.S. States | 0 | - | 4.85 | 100,358 |
| U.S. States with Short Names | 0 | - | 4.87 | 131,435 |
| U.S. States that Start with M | 0 | - | 4.91 | 152,003 |
| U.S. States By Population | 0 | - | 4.90 | 131,068 |
| U.S. States that Start with N | 0 | - | 4.95 | 156,542 |
| U.S. States with Longest Names | 0 | - | 4.84 | 36,576 |
| U.S. States with a Unique First Letter | 0 | - | 4.95 | 78,589 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 58,791 |
| The Only Remaining U.S. State . . . | 0 | - | 4.94 | 56,740 |
| US States with an Empty Map | 0 | - | 5.00 | 560,051 |
| 10 Longest Rivers in the United States | 0 | - | 4.82 | 35,292 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.96 | 279,165 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 125,645 |
| Countries that Beat the United States | 0 | - | 4.92 | 147,296 |
| Louisiana Purchase with a Map | 0 | - | 4.95 | 36,972 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 90,445 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 73,936 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 72,402 |
| U.S. States or European Countries by Population | 0 | - | 4.98 | 116,944 |
| Hawaiian Islands Map Quiz | 0 | - | 4.88 | 21,183 |
| People on Money - United States | 0 | - | 4.31 | 61,913 |
| U.S. History Groups of Two | 0 | - | 4.28 | 35,562 |
| Name a Valid U.S. State #1 | 0 | - | 4.95 | 186,683 |
| Top 10 Coldest U.S. States | 0 | - | 4.91 | 101,267 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 101,789 |
| Top 10 Most Native American U.S. States | 0 | - | 4.84 | 72,096 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 57,348 |
| U.S. History for Dummies | 0 | - | 4.50 | 65,980 |
| States of Mexico | 0 | - | 4.94 | 143,731 |
| Mexico States Map Quiz | 0 | - | 4.84 | 91,515 |
| Events in U.S. History | 0 | - | 4.38 | 26,315 |
| U.S. State Nicknames Quiz | 0 | - | 4.48 | 46,558 |
| U.S. National Parks Quiz | 0 | - | 4.78 | 47,370 |
| Countries with American Expatriates | 0 | - | 4.58 | 41,078 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 38,516 |
| United States Country Quiz | 0 | - | 4.44 | 90,263 |
| Busiest Air Routes from the U.S. | 0 | - | 4.47 | 72,932 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,206,242 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.78 | 57,731 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 41,534 |
| The Life of Thomas Edison | 0 | - | 4.03 | 4,663 |
| Valid Answer - U.S. History | 0 | - | 4.19 | 21,477 |
| Countries Closest to Canada | 0 | - | 4.90 | 185,564 |
| Asian Last Names in the United States | 0 | - | 4.41 | 43,595 |
| Canada or Africa by Area | 0 | - | 4.81 | 14,203 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 705,270 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 199,492 |
| U.S. Federal Agency Acronyms | 0 | - | 4.51 | 76,387 |
| 10 Closest Megacities to New York City | 0 | - | 4.51 | 64,528 |
| Six Flags Over Texas | 0 | - | 4.84 | 59,176 |
| New England States | 0 | - | 4.52 | 52,522 |
| US States by Land Area | 0 | - | 4.54 | 48,808 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 36,362 |
| Add a Letter - Make a U.S. State | 0 | - | 4.75 | 77,054 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 51,478 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.78 | 37,549 |
| Save Americans by Guessing U.S. States | 0 | - | 4.57 | 153,096 |
| 10 Easternmost U.S. States | 0 | - | 4.54 | 53,240 |
| The Only U.S. State ... #1 | 0 | - | 4.55 | 83,015 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.47 | 40,766 |
| Countries that Beat Canada | 0 | - | 4.91 | 78,853 |
| United States Map Quiz | 0 | - | 4.98 | 3,923,757 |
| Red State or Blue State Trait? | 0 | - | 4.44 | 49,020 |
| History of Pennsylvania | 0 | - | 4.09 | 6,489 |
| History of Virginia | 0 | - | 4.33 | 10,977 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 49,457 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.69 | 60,393 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.75 | 54,258 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.76 | 53,116 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.76 | 33,557 |
| U.S. States with the Longest International Borders | 0 | - | 4.81 | 41,836 |
| Longest U.S. State Borders | 0 | - | 4.65 | 34,704 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 58,460 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.41 | 50,223 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.65 | 46,899 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.54 | 31,860 |
| U.S. States with the Fewest Borders | 0 | - | 4.75 | 106,359 |
| U.S. States with the Most Borders | 0 | - | 4.56 | 61,178 |
| Belize Country Quiz | 0 | - | 4.88 | 18,964 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 17,266 |
| Top U.S. Universities | 0 | - | 4.10 | 114,383 |
| Largest United States Airlines | 0 | - | 4.38 | 52,265 |
| Third Most Common Language by U.S. State | 0 | - | 4.90 | 107,896 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.38 | 7,909 |
| U.S. States by Governor Quiz | 0 | - | 4.42 | 17,021 |
| U.S. Political Parties in History | 0 | - | 4.43 | 26,281 |
| U.S. Government Agencies | 0 | - | 4.41 | 17,820 |
| U.S. Presidents by Picture | 0 | - | 4.85 | 397,067 |
| American Founding Fathers | 0 | - | 4.36 | 22,146 |
| Florida Pro Sport Teams | 0 | - | 4.66 | 10,470 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.92 | 51,030 |
| Georgia ... or Georgia? | 0 | - | 4.79 | 72,413 |
| Dominica Country Quiz | 0 | - | 4.83 | 17,986 |
| American Legal Vocabulary | 0 | - | 4.40 | 32,297 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 31,971 |
| Cities by Picture #2 | 0 | - | 4.22 | 32,620 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.52 | 34,295 |
| Biggest Trading Partners - US | 0 | - | 4.63 | 102,161 |
| American Geography Quiz for Dummies | 0 | - | 4.33 | 53,348 |
| The U.S. Government - How Does it Work? | 0 | - | 4.32 | 40,068 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 355,546 |
| Famous People from California by Picture | 0 | - | 4.31 | 32,226 |
| California Groups of Things | 0 | - | 4.23 | 43,076 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.40 | 56,045 |
| New York Groups of Things | 0 | - | 4.39 | 57,532 |
| Famous People from Texas by Picture | 0 | - | 4.04 | 31,744 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.34 | 71,173 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.49 | 20,579 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.44 | 47,831 |
| Flyover States | 0 | - | 4.51 | 28,121 |
| U.S. States With Double Letters | 0 | - | 4.68 | 19,753 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.30 | 58,178 |
| U.S. States by Borders | 0 | - | 4.56 | 26,526 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 37,574 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 35,490 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 70,057 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 44,503 |
| U.S. State Superlatives #1 | 0 | - | 4.46 | 75,765 |
| U.S. State Superlatives #2 | 0 | - | 4.51 | 37,535 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.38 | 121,379 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.54 | 60,952 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 103,799 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.49 | 35,293 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.79 | 58,952 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 39,557 |
| Flags of North and South America Quiz | 0 | - | 4.99 | 313,800 |
| The Only American Country ... | 0 | - | 4.94 | 110,847 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 101,724 |
| U.S. State Border Crossings | 0 | - | 4.96 | 82,720 |
| U.S. Citizenship Test Questions | 0 | - | 4.86 | 223,709 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.84 | 34,296 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 66,046 |
| Name a Valid U.S. President #1 | 0 | - | 4.93 | 169,151 |
| Play-Doh Presidents | 0 | - | 5.00 | 75,810 |
| Cities and Towns of Massachusetts | 0 | - | 4.90 | 61,626 |
| Who Did that Motown Song | 0 | - | 4.45 | 12,701 |
| Old West History | 0 | - | 4.28 | 14,812 |
| Life of Benjamin Franklin | 0 | - | 4.20 | 6,237 |
| American Revolution - Multiple Choice | 0 | - | 4.32 | 18,910 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 19,818 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 27,595 |
| Which U.S. State - Multiple Choice | 0 | - | 4.45 | 19,078 |
| Movies by State Quiz | 0 | - | 4.23 | 39,472 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.60 | 31,236 |
| Canada Country Quiz | 0 | - | 4.54 | 122,322 |
| Canada Cities Map Quiz | 0 | - | 4.55 | 110,076 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 135,163 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 63,990 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.94 | 50,531 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 59,756 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 47,185 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 94,754 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 101,593 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 94,703 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 82,422 |
| Mexico Country Quiz | 0 | - | 4.48 | 66,980 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.91 | 41,282 |
| Brazil States Map Quiz | 0 | - | 4.84 | 40,348 |
| States of Brazil | 0 | - | 4.97 | 70,177 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 18,486 |
| U.S. States by Picture #1 | 0 | - | 4.17 | 14,423 |
| Most-Visited U.S. Cities | 0 | - | 4.87 | 74,189 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 63,864 |
| Senators Who Ran For President | 0 | - | 4.28 | 16,352 |
| U.S. Electoral College Landslides | 0 | - | 4.33 | 21,081 |
| Geography of California | 0 | - | 4.23 | 9,723 |
| California Pro Sport Teams | 0 | - | 4.25 | 22,157 |
| Chicago City Trivia | 0 | - | 4.26 | 30,470 |
| Boston Talk to English Translation Quiz | 0 | - | 4.46 | 14,246 |
| New York Pro Sport Teams | 0 | - | 4.30 | 24,709 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.85 | 22,215 |
| Texas Pro Sport Teams | 0 | - | 4.13 | 16,271 |
| Washington State by Picture | 0 | - | 4.18 | 7,181 |
| Embarrassing Chapters in US History | 0 | - | 4.15 | 31,597 |
| Events by U.S. State #1 | 0 | - | 4.42 | 21,867 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 31,503 |
| A Superlative for Every U.S. State | 0 | - | 4.47 | 25,205 |
| Most Valuable Crops by U.S. State | 0 | - | 4.39 | 36,987 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.30 | 35,151 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 31,442 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.51 | 27,675 |
| U.S. States with the Most Venomous Snake Species | 0 | - | 4.47 | 25,161 |
| U.S. States with the Most Endangered Species | 0 | - | 4.50 | 13,893 |
| African-American Historical Figures | 0 | - | 4.14 | 16,447 |
| Canadian Prime Ministers Quiz | 0 | - | 4.64 | 50,276 |
| Capitals of Canadian Provinces | 0 | - | 4.86 | 74,201 |
| Most-Visited Countries by Canadians | 0 | - | 4.79 | 38,003 |
