| Deadliest U.S. Wars | 0 | - | 4.89 | 192,123 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 176,050 |
| Countries that Beat the United States | 0 | - | 4.93 | 169,041 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,542 |
| US States Quiz | 0 | - | 5.00 | 17,036,578 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 211,012 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 369,012 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,650 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,641 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 247,328 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,211 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,876 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 336,672 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,645 |
| Pixelated United States Map | 0 | - | 4.89 | 95,058 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,857 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,684 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,279 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,511 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,521 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,615 |
| U.S. States that Start with M | 0 | - | 4.94 | 188,687 |
| U.S. States By Population | 0 | - | 4.92 | 154,329 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,461 |
| U.S. States with Longest Names | 0 | - | 4.85 | 45,032 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 89,040 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,627 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,268 |
| 10 Longest Rivers in the United States | 0 | - | 4.86 | 39,487 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,484 |
| Events in U.S. History | 0 | - | 4.41 | 28,871 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,522 |
| US States with an Empty Map | 0 | - | 5.00 | 630,017 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,642 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,149 |
| Countries that Beat Canada | 0 | - | 4.90 | 99,187 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,501 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,727 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,831 |
| American Founding Fathers | 0 | - | 4.42 | 23,311 |
| People on Money - United States | 0 | - | 4.31 | 63,524 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.09 | 55,101 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,516 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,136 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,798 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 93,076 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,314 |
| Asian Last Names in the United States | 0 | - | 4.43 | 47,049 |
| American Countries with the Shortest Names | 0 | - | 4.97 | 121,842 |
| Names of Generations | 0 | - | 4.09 | 45,640 |
| States of Mexico | 0 | - | 4.96 | 178,999 |
| Mexico States Map Quiz | 0 | - | 4.85 | 105,865 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,249 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,911 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,706 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,307 |
| United States Country Quiz | 0 | - | 4.43 | 102,416 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,128 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,734,090 |
| California Groups of Things | 0 | - | 4.26 | 45,821 |
| New York Groups of Things | 0 | - | 4.39 | 72,439 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,526 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,370 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,687 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,753 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,279 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,190 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 58,674 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 750,645 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,858 |
| Name a Valid U.S. City over 100,000 | 0 | - | 4.42 | 40,500 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,227 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,188 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,582 |
| American History Quotes #1 | 0 | - | 4.37 | 96,271 |
| American History Quotes #2 | 0 | - | 4.38 | 41,549 |
| New England States | 0 | - | 4.51 | 59,919 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,136 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,144 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,268 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,365 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,205 |
| U.S. States by Borders | 0 | - | 4.61 | 35,526 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 189,494 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,738 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,428 |
| Movies by State | 0 | - | 4.27 | 40,622 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,497 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,695 |
| History of Pennsylvania | 0 | - | 4.16 | 7,180 |
| History of Virginia | 0 | - | 4.33 | 11,651 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 39,263 |
| Flags of North and South America | 0 | - | 4.99 | 378,661 |
| Belize Country Quiz | 0 | - | 4.85 | 21,139 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,336 |
| Top U.S. Universities | 0 | - | 4.15 | 146,078 |
| Largest United States Airlines | 0 | - | 4.39 | 55,194 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,365 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,166 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,934 |
| U.S. States by Governor | 0 | - | 4.43 | 18,131 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,795 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,820 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,046 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,921 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,324 |
| The American Civil War | 0 | - | 4.62 | 52,687 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,218 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,201 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,709 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.70 | 61,635 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,962 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,576 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.75 | 35,149 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,999 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,226 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,740 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,801 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 68,005 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.54 | 65,086 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,506 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,130 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,589 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,859 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,862 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,609 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,389 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,337,918 |
| Georgia ... or Georgia? | 0 | - | 4.68 | 77,120 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,720 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,780 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,741 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,487 |
| U.S. Geography by Letter - P | 0 | - | 4.40 | 54,659 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,811 |
| U.S. Geography by Letter - L | 0 | - | 4.08 | 41,763 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,903 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 37,113 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,850 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,979 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,055 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,060 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,774 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,345 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,516 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,068 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,772 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,336 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,142 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,585 |
| Flyover States | 0 | - | 4.53 | 29,625 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,318 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,476 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,486 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,220 |
| Musical Acts by State | 0 | - | 4.05 | 19,615 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 129,073 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,407 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,725 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,881 |
| Famous Italian-Americans | 0 | - | 4.15 | 14,611 |
| The Only American Country ... | 0 | - | 4.92 | 122,424 |
| U.S. State Border Crossings | 0 | - | 4.97 | 97,007 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,062 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 76,121 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,172 |
| Play-Doh Presidents | 0 | - | 5.00 | 83,003 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,345 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,089 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,361 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,379 |
| Regions of U.S. States | 0 | - | 4.37 | 44,296 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,436 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,649 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,954 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,394 |
| People by U.S. State - Multiple Choice | 0 | - | 4.06 | 9,866 |
| Canada Country Quiz | 0 | - | 4.55 | 133,245 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,740 |
| Canada A-Z | 0 | - | 4.73 | 33,007 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,679 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,324 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,146 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,108 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 136,384 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,643 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,687 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.92 | 95,841 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 93,029 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 53,225 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 49,262 |
| U.S. Geography by Letter - F | 0 | - | 3.85 | 45,546 |
| U.S. Geography by Letter - O | 0 | - | 3.52 | 42,006 |
| Hispanic Last Names in the U.S. | 0 | - | 4.31 | 54,892 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,874 |
| South American Geography Quiz #1 | 0 | - | 4.63 | 32,946 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.93 | 55,124 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,787 |
| States of Brazil | 0 | - | 4.98 | 90,210 |
| Colombia Country Quiz | 0 | - | 4.90 | 41,094 |
