| Deadliest U.S. Wars | 0 | - | 4.89 | 190,603 |
| US States Quiz | 0 | - | 5.00 | 16,845,173 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,837 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,383 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,282 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 243,450 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,831 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,138 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,725 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 331,355 |
| Pixelated United States Map | 0 | - | 4.87 | 94,128 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,440 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,577 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,703 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,238 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,258 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,778 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,059 |
| U.S. States By Population | 0 | - | 4.92 | 153,288 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,277 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,360 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,184 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,134 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,510 |
| US States with an Empty Map | 0 | - | 5.00 | 623,674 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,125 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,207 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,656 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,453 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,643 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,370 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,834 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,994 |
| People on Money - United States | 0 | - | 4.31 | 63,327 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,424 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,572 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,546 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,476 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,864 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,850 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,974 |
| States of Mexico | 0 | - | 4.95 | 175,675 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,574 |
| Events in U.S. History | 0 | - | 4.40 | 28,637 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,684 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,436 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,474 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,567 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,162 |
| United States Country Quiz | 0 | - | 4.43 | 101,396 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,837 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,691,258 |
| American Founding Fathers | 0 | - | 4.42 | 23,206 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,011 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,519 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,280 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,101 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,916 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,343 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,822 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 746,524 |
| Names of Generations | 0 | - | 4.10 | 44,513 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,963 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,079 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,941 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,846 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,317 |
| New England States | 0 | - | 4.51 | 59,791 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,761 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,991 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,734 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,942 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,885 |
| U.S. States by Borders | 0 | - | 4.61 | 35,274 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 185,284 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,450 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,985 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,192 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,336 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,729 |
| United States Map Quiz | 0 | - | 4.98 | 4,155,079 |
| History of Pennsylvania | 0 | - | 4.16 | 7,131 |
| History of Virginia | 0 | - | 4.31 | 11,590 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,870 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,736 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,447 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,168 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,029 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,764 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,745 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,864 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,392 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,475 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,748 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,449 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,292 |
| Flags of North and South America | 0 | - | 4.99 | 372,310 |
| Belize Country Quiz | 0 | - | 4.85 | 20,946 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,190 |
| Top U.S. Universities | 0 | - | 4.15 | 144,929 |
| Largest United States Airlines | 0 | - | 4.39 | 55,004 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,675 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,328 |
| U.S. States by Governor | 0 | - | 4.43 | 18,048 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,677 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,656 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,104 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,826 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,097 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,897 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,699 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,026 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,021 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,015 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,704 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 53,524 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,288 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,071 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,243 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,056 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,814 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,894 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,514 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,097 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 42,045 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,616 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,334 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,229 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,389 |
| California Groups of Things | 0 | - | 4.25 | 45,442 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,253 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,929 |
| New York Groups of Things | 0 | - | 4.37 | 63,332 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,915 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,714 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,807 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,511 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,996 |
| Flyover States | 0 | - | 4.52 | 29,489 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,094 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,092 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,325 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,087 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,486 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,926 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,980 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,487 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,608 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,303 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,706 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,044 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,271 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,486 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,713 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,680 |
| The Only American Country ... | 0 | - | 4.92 | 121,465 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,994 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,393 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,263 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,374 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,495 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,189 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,813 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,049 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,852 |
| Old West History | 0 | - | 4.33 | 15,261 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,517 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,919 |
| Regions of U.S. States | 0 | - | 4.37 | 43,822 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,376 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,559 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,839 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,275 |
| Movies by State | 0 | - | 4.27 | 40,530 |
| Canada Country Quiz | 0 | - | 4.54 | 132,376 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,104 |
| Canada A-Z | 0 | - | 4.73 | 32,789 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,994 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 79,099 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,397 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,794 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,704 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,690 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,029 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,363 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,718 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,947 |
| States of Brazil | 0 | - | 4.97 | 87,747 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,192 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,421 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,594 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,627 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,033 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,032 |
| Geography of California | 0 | - | 4.26 | 10,552 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,678 |
| Chicago City Trivia | 0 | - | 4.31 | 31,437 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,889 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,812 |
| Washington State by Picture | 0 | - | 4.26 | 7,726 |
