| Deadliest U.S. Wars | 0 | - | 4.89 | 191,865 |
| US States Quiz | 0 | - | 5.00 | 17,007,158 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,764 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,531 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,467 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,625 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 246,715 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,128 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,765 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 335,823 |
| Pixelated United States Map | 0 | - | 4.89 | 94,852 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,630 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,502 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,125 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,339 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,362 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,419 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,445 |
| U.S. States By Population | 0 | - | 4.92 | 154,201 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,294 |
| U.S. States with Longest Names | 0 | - | 4.85 | 44,930 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,908 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,562 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,147 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,416 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,294 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,754 |
| Events in U.S. History | 0 | - | 4.41 | 28,834 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,375 |
| US States with an Empty Map | 0 | - | 5.00 | 629,069 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,522 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,064 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,264 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,480 |
| People on Money - United States | 0 | - | 4.31 | 63,441 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,598 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,661 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,925 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,582 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,920 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,236 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,440 |
| States of Mexico | 0 | - | 4.96 | 178,423 |
| Mexico States Map Quiz | 0 | - | 4.85 | 105,706 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,186 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,836 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,768 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,682 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,287 |
| United States Country Quiz | 0 | - | 4.43 | 102,262 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,083 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,728,021 |
| American Founding Fathers | 0 | - | 4.42 | 23,275 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,240 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,606 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,639 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,548 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,229 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,089 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 58,159 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 750,001 |
| Names of Generations | 0 | - | 4.09 | 45,556 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,605 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,454 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,161 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,133 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,545 |
| New England States | 0 | - | 4.51 | 59,906 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,086 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,127 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,180 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,304 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,161 |
| U.S. States by Borders | 0 | - | 4.62 | 35,493 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 189,033 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,697 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,365 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,459 |
| Countries that Beat Canada | 0 | - | 4.90 | 99,051 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,977 |
| United States Map Quiz | 0 | - | 4.98 | 4,172,323 |
| History of Pennsylvania | 0 | - | 4.16 | 7,168 |
| History of Virginia | 0 | - | 4.33 | 11,643 |
| Flags of North and South America | 0 | - | 4.99 | 377,449 |
| Belize Country Quiz | 0 | - | 4.85 | 21,107 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,310 |
| Top U.S. Universities | 0 | - | 4.15 | 145,891 |
| Largest United States Airlines | 0 | - | 4.39 | 55,171 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,362 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,046 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,899 |
| U.S. States by Governor | 0 | - | 4.43 | 18,116 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,772 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,788 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,737 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,670 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,911 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,271 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,206 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,162 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,122 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,669 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.70 | 61,274 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,856 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,570 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,418 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.75 | 35,123 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,321 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,966 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,162 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,693 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,769 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,989 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 65,022 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,460 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,054 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.44 | 70,658 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.74 | 64,220 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,576 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,842 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,834 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,267 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,375 |
| Georgia ... or Georgia? | 0 | - | 4.68 | 77,061 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,644 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,683 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,647 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,417 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,567 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,749 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,677 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,825 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 37,034 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,755 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,949 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,005 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,030 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,740 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,307 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,485 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,728 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,729 |
| California Groups of Things | 0 | - | 4.26 | 45,789 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,322 |
| New York Groups of Things | 0 | - | 4.39 | 72,228 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,930 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,789 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,070 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,574 |
| Flyover States | 0 | - | 4.53 | 29,603 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,282 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,428 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,469 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,195 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 129,003 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,356 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,691 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,592 |
| The Only American Country ... | 0 | - | 4.92 | 122,258 |
| American Countries with the Shortest Names | 0 | - | 4.97 | 121,711 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,918 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,882 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,995 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,895 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,907 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,091 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,077 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,293 |
| Old West History | 0 | - | 4.34 | 15,307 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,536 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,990 |
| Regions of U.S. States | 0 | - | 4.37 | 44,215 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,428 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,634 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,939 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,377 |
| Movies by State | 0 | - | 4.27 | 40,612 |
| Canada Country Quiz | 0 | - | 4.55 | 133,093 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,641 |
| Canada A-Z | 0 | - | 4.73 | 32,980 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,453 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,711 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,890 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 71,927 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,645 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,638 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.94 | 95,476 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,889 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 53,174 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 49,204 |
| U.S. Geography by Letter - F | 0 | - | 3.85 | 45,480 |
| U.S. Geography by Letter - O | 0 | - | 3.52 | 41,953 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,787 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.93 | 54,944 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,656 |
| States of Brazil | 0 | - | 4.98 | 89,873 |
| Colombia Country Quiz | 0 | - | 4.90 | 41,025 |
| 15 Largest Cities in North America With a Map | 0 | - | 4.98 | 48,111 |
| 100 Biggest Cities in North America on a Map | 0 | - | 4.84 | 62,975 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,236 |
