| Deadliest U.S. Wars | 0 | - | 4.89 | 191,060 |
| US States Quiz | 0 | - | 5.00 | 16,916,063 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,103 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,860 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,820 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,803 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,934 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,387 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,782 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,071 |
| Pixelated United States Map | 0 | - | 4.88 | 94,454 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,932 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,983 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,128 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,699 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,664 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,322 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,625 |
| U.S. States By Population | 0 | - | 4.92 | 153,729 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,696 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,590 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,494 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,330 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,788 |
| Events in U.S. History | 0 | - | 4.41 | 28,707 |
| US States with an Empty Map | 0 | - | 5.00 | 625,936 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,232 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,677 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,802 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,832 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,931 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,605 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,361 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,492 |
| People on Money - United States | 0 | - | 4.31 | 63,373 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,504 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,438 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,284 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,924 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,329 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,991 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,187 |
| States of Mexico | 0 | - | 4.96 | 176,739 |
| Mexico States Map Quiz | 0 | - | 4.84 | 105,049 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,911 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,659 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,589 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,613 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,215 |
| United States Country Quiz | 0 | - | 4.43 | 101,709 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,947 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,707,833 |
| American Founding Fathers | 0 | - | 4.42 | 23,238 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,116 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,554 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,446 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,589 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,057 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,568 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,979 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 748,006 |
| Names of Generations | 0 | - | 4.09 | 45,180 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 209,809 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,242 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,033 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 59,955 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,392 |
| New England States | 0 | - | 4.51 | 59,834 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,888 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,036 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 82,909 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,109 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,999 |
| U.S. States by Borders | 0 | - | 4.61 | 35,373 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 186,434 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,542 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,143 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,270 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,481 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,833 |
| United States Map Quiz | 0 | - | 4.98 | 4,163,414 |
| History of Pennsylvania | 0 | - | 4.16 | 7,146 |
| History of Virginia | 0 | - | 4.31 | 11,614 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 52,988 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,889 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,532 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,241 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,072 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,845 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,920 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,908 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,545 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.74 | 63,924 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,525 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,792 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 113,980 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,324 |
| Flags of North and South America | 0 | - | 4.99 | 374,249 |
| Belize Country Quiz | 0 | - | 4.85 | 21,012 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,244 |
| Top U.S. Universities | 0 | - | 4.15 | 145,368 |
| Largest United States Airlines | 0 | - | 4.39 | 55,073 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,804 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,339 |
| U.S. States by Governor | 0 | - | 4.43 | 18,078 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,716 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,709 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,015 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,864 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,132 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,620 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,865 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,200 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,230 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,200 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,891 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,033 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,404 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,243 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,410 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,280 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,863 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,956 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,612 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,180 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,048 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,725 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,398 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,288 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,529 |
| California Groups of Things | 0 | - | 4.25 | 45,526 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,292 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,021 |
| New York Groups of Things | 0 | - | 4.35 | 63,923 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,918 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,749 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,917 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,538 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,531 |
| Flyover States | 0 | - | 4.52 | 29,537 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,168 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,255 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,382 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,133 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,513 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,146 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,099 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,575 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,669 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,481 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,848 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,170 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,346 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,566 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,856 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,739 |
| The Only American Country ... | 0 | - | 4.92 | 121,807 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,266 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,601 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,740 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,606 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,573 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,462 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,394 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,062 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,026 |
| Old West History | 0 | - | 4.34 | 15,285 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,527 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,950 |
| Regions of U.S. States | 0 | - | 4.37 | 43,978 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,399 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,597 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,873 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,321 |
| Movies by State | 0 | - | 4.27 | 40,563 |
| Canada Country Quiz | 0 | - | 4.54 | 132,656 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,351 |
| Canada A-Z | 0 | - | 4.73 | 32,887 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,734 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,346 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,083 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,305 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,129 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,072 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,374 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,520 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 54,168 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,235 |
| States of Brazil | 0 | - | 4.97 | 88,565 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,208 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,465 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 94,191 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 82,008 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,056 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,051 |
| Geography of California | 0 | - | 4.26 | 10,587 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,697 |
| Chicago City Trivia | 0 | - | 4.31 | 31,473 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,921 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,832 |
