| Deadliest U.S. Wars | 0 | - | 4.89 | 189,675 |
| US States Quiz | 0 | - | 5.00 | 16,768,003 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,511 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,961 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,674 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,050 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,653 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,866 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,033 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,470 |
| Pixelated United States Map | 0 | - | 4.89 | 93,767 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,925 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,192 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,272 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,857 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,848 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,270 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,506 |
| U.S. States By Population | 0 | - | 4.92 | 152,734 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,829 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,132 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,895 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,956 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,211 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,697 |
| US States with an Empty Map | 0 | - | 5.00 | 621,020 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,924 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,772 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,067 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,021 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,356 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,165 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,232 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,418 |
| American Founding Fathers | 0 | - | 4.42 | 23,099 |
| People on Money - United States | 0 | - | 4.31 | 63,256 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,327 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,802 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,467 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,172 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,026 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,456 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,674 |
| States of Mexico | 0 | - | 4.95 | 174,434 |
| Mexico States Map Quiz | 0 | - | 4.84 | 104,123 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,376 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,513 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,119 |
| United States Country Quiz | 0 | - | 4.43 | 100,969 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,710 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,671,373 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,158 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,667 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,773 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,954 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,439 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 744,879 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,368 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,896 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,829 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,707 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,239 |
| New England States | 0 | - | 4.51 | 59,749 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,614 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,941 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,533 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,801 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,774 |
| U.S. States by Borders | 0 | - | 4.63 | 35,178 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 183,692 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,350 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,770 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,072 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,084 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,589 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,379 |
| History of Pennsylvania | 0 | - | 4.16 | 7,106 |
| History of Virginia | 0 | - | 4.31 | 11,571 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,751 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,566 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,357 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,093 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,967 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,681 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,557 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,812 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,428 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,700 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,217 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,262 |
| Flags of North and South America | 0 | - | 4.99 | 369,704 |
| Belize Country Quiz | 0 | - | 4.85 | 20,867 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,108 |
| Top U.S. Universities | 0 | - | 4.15 | 144,453 |
| Largest United States Airlines | 0 | - | 4.39 | 54,910 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,512 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,316 |
| U.S. States by Governor | 0 | - | 4.43 | 18,011 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,611 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,596 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,796 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,784 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,191 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,571 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,722 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,688 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,680 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,352 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,796 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,938 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,786 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,920 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,707 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,729 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,836 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,426 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,001 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,508 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,476 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,252 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,246 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,270 |
| California Groups of Things | 0 | - | 4.25 | 45,331 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,220 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,814 |
| New York Groups of Things | 0 | - | 4.38 | 60,012 |
| The American Civil War | 0 | - | 4.62 | 52,260 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,700 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,484 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,553 |
| Flyover States | 0 | - | 4.52 | 29,442 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,999 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,951 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,257 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 37,013 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,443 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,668 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,822 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,362 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,533 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,141 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,583 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,686 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,176 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,394 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,548 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,620 |
| The Only American Country ... | 0 | - | 4.92 | 121,121 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,685 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,170 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,748 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,120 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,575 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,901 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,380 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,033 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,656 |
| American History Quotes #1 | 0 | - | 4.37 | 95,779 |
| American History Quotes #2 | 0 | - | 4.38 | 41,265 |
| Regions of U.S. States | 0 | - | 4.37 | 43,628 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,356 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,517 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,807 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,239 |
| Movies by State | 0 | - | 4.27 | 40,484 |
| Canada Country Quiz | 0 | - | 4.55 | 132,027 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,829 |
| Canada A-Z | 0 | - | 4.73 | 32,712 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,447 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,789 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,899 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,431 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,252 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,400 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,155 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,367 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,320 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,601 |
| States of Brazil | 0 | - | 4.97 | 86,994 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,169 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,385 |
| Most-Visited U.S. Cities | 0 | - | 4.85 | 92,917 |
| Every U.S. Metro Area on a Map | 0 | - | 4.97 | 81,178 |
| Senators Who Ran For President | 0 | - | 4.24 | 17,013 |
| U.S. Electoral College Landslides | 0 | - | 4.35 | 22,011 |
| Geography of California | 0 | - | 4.25 | 10,524 |
| California Pro Sport Teams | 0 | - | 4.19 | 22,663 |
| Chicago City Trivia | 0 | - | 4.31 | 31,405 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,833 |
| Texas Pro Sport Teams | 0 | - | 4.19 | 16,793 |
| Washington State by Picture | 0 | - | 4.26 | 7,702 |
| Events by U.S. State #1 | 0 | - | 4.43 | 22,868 |
| A Superlative for Every U.S. State | 0 | - | 4.44 | 27,981 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 38,997 |
| 10 U.S. States with the Highest Tax Burden | 0 | - | 4.26 | 38,103 |
| Top 10 U.S. States by Manufacturing Employment | 0 | - | 4.49 | 28,772 |
| U.S. States with the Most Venomous Snake Species | 0 | - | 4.47 | 26,351 |
| U.S. States with the Most Endangered Species | 0 | - | 4.50 | 14,335 |
| African-American Historical Figures | 0 | - | 4.18 | 17,150 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,246 |
