| Deadliest U.S. Wars | 0 | - | 4.89 | 190,167 |
| US States Quiz | 0 | - | 5.00 | 16,795,760 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,632 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,137 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,888 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,578 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,724 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,958 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,268 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,225 |
| Pixelated United States Map | 0 | - | 4.89 | 93,894 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,109 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,347 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,450 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,001 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,010 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,482 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,698 |
| U.S. States By Population | 0 | - | 4.92 | 152,857 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,989 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,220 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,020 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,025 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,343 |
| US States with an Empty Map | 0 | - | 5.00 | 621,876 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,012 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,948 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,274 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,193 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,469 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,244 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,483 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,638 |
| People on Money - United States | 0 | - | 4.31 | 63,287 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,356 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,046 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,306 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,182 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,630 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,741 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,807 |
| States of Mexico | 0 | - | 4.95 | 174,999 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,270 |
| Events in U.S. History | 0 | - | 4.40 | 28,587 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,415 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,530 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,144 |
| United States Country Quiz | 0 | - | 4.43 | 101,137 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,776 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,678,761 |
| American Founding Fathers | 0 | - | 4.42 | 23,157 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,906 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,500 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,210 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,829 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,826 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,009 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,490 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,523 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,566 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,954 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,873 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,772 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,262 |
| New England States | 0 | - | 4.51 | 59,764 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,679 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,959 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,600 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,863 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,815 |
| U.S. States by Borders | 0 | - | 4.61 | 35,220 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 184,362 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,380 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,867 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,105 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,172 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,656 |
| United States Map Quiz | 0 | - | 4.98 | 4,149,740 |
| History of Pennsylvania | 0 | - | 4.16 | 7,116 |
| History of Virginia | 0 | - | 4.31 | 11,577 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,796 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,637 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,390 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,122 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,988 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,716 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,625 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,837 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,261 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,443 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,714 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,296 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,269 |
| Flags of North and South America | 0 | - | 4.99 | 370,765 |
| Belize Country Quiz | 0 | - | 4.85 | 20,898 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,141 |
| Top U.S. Universities | 0 | - | 4.15 | 144,611 |
| Largest United States Airlines | 0 | - | 4.39 | 54,944 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,583 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,320 |
| U.S. States by Governor | 0 | - | 4.43 | 18,026 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,634 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,617 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,294 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,803 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,059 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,483 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,612 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,766 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,738 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,734 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,408 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,853 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,969 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,830 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,967 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,779 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,763 |
| Names of Generations | 0 | - | 4.00 | 39,189 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,853 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,459 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,032 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,787 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,527 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,292 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,563 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,315 |
| California Groups of Things | 0 | - | 4.25 | 45,346 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,229 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,858 |
| New York Groups of Things | 0 | - | 4.38 | 60,036 |
| The Life of Thomas Edison | 0 | - | 3.95 | 4,911 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,695 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,735 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,499 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,736 |
| Flyover States | 0 | - | 4.52 | 29,459 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,029 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,010 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,282 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 37,042 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,459 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,792 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,886 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,415 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,560 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,188 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,628 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,732 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,207 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,432 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,599 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,639 |
| The Only American Country ... | 0 | - | 4.92 | 121,238 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,790 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,258 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,941 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,224 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,905 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,993 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,544 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,040 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,728 |
| Old West History | 0 | - | 4.33 | 15,247 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,511 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,897 |
| Regions of U.S. States | 0 | - | 4.37 | 43,694 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,360 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,529 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,817 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,253 |
| Movies by State | 0 | - | 4.27 | 40,507 |
| Canada Country Quiz | 0 | - | 4.54 | 132,156 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,944 |
| Canada A-Z | 0 | - | 4.73 | 32,738 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,640 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,947 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,070 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,561 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,451 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,417 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,530 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,249 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 36,396 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,448 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,725 |
| States of Brazil | 0 | - | 4.97 | 87,282 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,176 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,399 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 93,164 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,334 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,021 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,022 |
| Geography of California | 0 | - | 4.26 | 10,535 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,671 |
| Chicago City Trivia | 0 | - | 4.31 | 31,420 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,857 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,798 |
| Washington State by Picture | 0 | - | 4.26 | 7,707 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,880 |
