| Deadliest U.S. Wars | 0 | - | 4.89 | 190,797 |
| US States Quiz | 0 | - | 5.00 | 16,875,312 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,945 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,644 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,495 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,051 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,879 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,227 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,049 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 331,999 |
| Pixelated United States Map | 0 | - | 4.87 | 94,267 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,680 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,767 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,859 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,423 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,430 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,997 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,289 |
| U.S. States By Population | 0 | - | 4.92 | 153,542 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,446 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,437 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,301 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,210 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,615 |
| Events in U.S. History | 0 | - | 4.41 | 28,672 |
| US States with an Empty Map | 0 | - | 5.00 | 624,609 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,174 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,449 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,458 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,609 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,761 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,470 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,041 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,207 |
| People on Money - United States | 0 | - | 4.31 | 63,344 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,462 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,918 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,646 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,653 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,037 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,908 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,059 |
| States of Mexico | 0 | - | 4.96 | 176,100 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,738 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,795 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,546 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,525 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,584 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,173 |
| United States Country Quiz | 0 | - | 4.43 | 101,513 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,879 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,698,765 |
| American Founding Fathers | 0 | - | 4.42 | 23,224 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,054 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,535 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,384 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,348 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,976 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,419 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,864 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 747,138 |
| Names of Generations | 0 | - | 4.09 | 44,910 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 209,470 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,148 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,982 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,885 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,349 |
| New England States | 0 | - | 4.51 | 59,808 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,812 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,010 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,818 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,006 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,928 |
| U.S. States by Borders | 0 | - | 4.61 | 35,315 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 185,746 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,482 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,040 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,223 |
| Countries that Beat Canada | 0 | - | 4.91 | 97,467 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,768 |
| United States Map Quiz | 0 | - | 4.98 | 4,158,502 |
| History of Pennsylvania | 0 | - | 4.16 | 7,136 |
| History of Virginia | 0 | - | 4.31 | 11,599 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 52,927 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,797 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,485 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,187 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,044 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,797 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,819 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,874 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,445 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,494 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,774 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 113,848 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,305 |
| Flags of North and South America | 0 | - | 4.99 | 373,102 |
| Belize Country Quiz | 0 | - | 4.85 | 20,973 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,213 |
| Top U.S. Universities | 0 | - | 4.15 | 145,130 |
| Largest United States Airlines | 0 | - | 4.39 | 55,028 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,733 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,333 |
| U.S. States by Governor | 0 | - | 4.43 | 18,063 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,695 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,680 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,465 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,844 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,114 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,218 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,770 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,084 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,094 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,088 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,780 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 53,865 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,330 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,134 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,305 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,127 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,832 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,916 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,560 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,142 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 46,106 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,661 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,362 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,584 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,447 |
| California Groups of Things | 0 | - | 4.25 | 45,491 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,264 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,971 |
| New York Groups of Things | 0 | - | 4.35 | 63,701 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,916 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,733 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,848 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,522 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,221 |
| Flyover States | 0 | - | 4.52 | 29,513 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,123 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,161 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,345 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,101 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,500 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,020 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,034 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,533 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,632 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,375 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,746 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,096 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,302 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,521 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,768 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,701 |
| The Only American Country ... | 0 | - | 4.92 | 121,606 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,123 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,479 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,460 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,468 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,807 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,305 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,029 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,052 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,942 |
| Old West History | 0 | - | 4.34 | 15,274 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,519 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,927 |
| Regions of U.S. States | 0 | - | 4.37 | 43,876 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,387 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,572 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,850 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,295 |
| Movies by State | 0 | - | 4.27 | 40,542 |
| Canada Country Quiz | 0 | - | 4.54 | 132,479 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,207 |
| Canada A-Z | 0 | - | 4.73 | 32,837 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,336 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 81,859 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,680 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,013 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,890 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,865 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,181 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,424 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,916 |
| Brazil States Map Quiz | 0 | - | 4.85 | 48,057 |
| States of Brazil | 0 | - | 4.97 | 88,053 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,198 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,439 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,834 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,792 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,041 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,038 |
| Geography of California | 0 | - | 4.26 | 10,566 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,689 |
| Chicago City Trivia | 0 | - | 4.31 | 31,446 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,900 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,825 |
| Washington State by Picture | 0 | - | 4.26 | 7,728 |
