| Deadliest U.S. Wars | 0 | - | 4.89 | 190,366 |
| Pixelated United States Map | 0 | - | 4.87 | 93,987 |
| US States Quiz | 0 | - | 5.00 | 16,813,184 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,421 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,696 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,225 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,048 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,884 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,764 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,012 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,594 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,224 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,430 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,862 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,556 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,073 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,091 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,597 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,829 |
| U.S. States By Population | 0 | - | 4.92 | 152,925 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,090 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,271 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,064 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,066 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,396 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,058 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,036 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,405 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,286 |
| US States with an Empty Map | 0 | - | 5.00 | 622,384 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,528 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,294 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,600 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,762 |
| American Founding Fathers | 0 | - | 4.42 | 23,188 |
| People on Money - United States | 0 | - | 4.31 | 63,309 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,381 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,955 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,248 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,377 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,272 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,708 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,774 |
| States of Mexico | 0 | - | 4.95 | 175,281 |
| Mexico States Map Quiz | 0 | - | 4.85 | 104,361 |
| Events in U.S. History | 0 | - | 4.40 | 28,600 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,006 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,434 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,539 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,151 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,481 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,058 |
| United States Country Quiz | 0 | - | 4.43 | 101,219 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,801 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,683,749 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,232 |
| Countries Closest to Canada | 0 | - | 4.91 | 197,921 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,860 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,037 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,513 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,892 |
| Names of Generations | 0 | - | 4.10 | 43,085 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,714 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,000 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,907 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,793 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,283 |
| New England States | 0 | - | 4.51 | 59,773 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,713 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,971 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,638 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,892 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,845 |
| U.S. States by Borders | 0 | - | 4.61 | 35,240 |
| Save Americans by Guessing U.S. States | 0 | - | 4.63 | 184,727 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,403 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,906 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,125 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,235 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,680 |
| United States Map Quiz | 0 | - | 4.98 | 4,151,084 |
| U.S. States by Picture #1 | 0 | - | 4.21 | 15,407 |
| History of Pennsylvania | 0 | - | 4.16 | 7,119 |
| History of Virginia | 0 | - | 4.31 | 11,581 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,644 |
| Flags of North and South America | 0 | - | 4.99 | 371,345 |
| Belize Country Quiz | 0 | - | 4.85 | 20,913 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,162 |
| Top U.S. Universities | 0 | - | 4.15 | 144,733 |
| Largest United States Airlines | 0 | - | 4.39 | 54,964 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,323 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,892 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,549 |
| U.S. States by Governor | 0 | - | 4.43 | 18,032 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,653 |
| U.S. Political Figures by Picture #1 | 0 | - | 4.14 | 26,130 |
| U.S. Political Figures by Picture #2 | 0 | - | 4.10 | 15,499 |
| Female Political Figures by Picture - U.S. | 0 | - | 4.20 | 10,853 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,636 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,549 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,814 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,884 |
| The American Civil War | 0 | - | 4.62 | 52,341 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,830 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,673 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,419 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,132 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,848 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,468 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,854 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,010 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,924 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,728 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,669 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,441 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,577 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,844 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,660 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,231 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,638 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,455 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,723 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,651 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,345 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,276 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,794 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,772 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,773 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,441 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,882 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,000 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,863 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,999 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,823 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,780 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,610 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,869 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,311 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,822 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,343 |
| California Groups of Things | 0 | - | 4.25 | 45,387 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,241 |
| New York Groups of Things | 0 | - | 4.37 | 62,377 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,762 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,502 |
| Flyover States | 0 | - | 4.52 | 29,468 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,057 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 76,046 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,296 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,058 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,224 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,754 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,454 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,628 |
| The Only American Country ... | 0 | - | 4.92 | 121,314 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,856 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,313 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,052 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,280 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,116 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,071 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,635 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,041 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,766 |
| American History Quotes #1 | 0 | - | 4.37 | 95,930 |
| American History Quotes #2 | 0 | - | 4.38 | 41,355 |
| Regions of U.S. States | 0 | - | 4.37 | 43,736 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,362 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,542 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,829 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,262 |
| Movies by State | 0 | - | 4.27 | 40,516 |
| Canada Country Quiz | 0 | - | 4.54 | 132,245 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 124,013 |
| Canada A-Z | 0 | - | 4.73 | 32,754 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,748 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,028 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,167 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,627 |
| Flags of Countries of the World in 1910 | 0 | - | 4.96 | 78,567 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,515 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,094 |
| Every African Country Shape | 0 | - | 4.90 | 86,860 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,294 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 82,846 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,621 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 52,538 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 48,535 |
| U.S. Geography by Letter - F | 0 | - | 3.87 | 44,792 |
| U.S. Geography by Letter - O | 0 | - | 3.52 | 41,257 |
| U.S. Geography by Letter - R | 0 | - | 4.18 | 30,674 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,281 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,520 |
| Brazil States Map Quiz | 0 | - | 4.85 | 47,785 |
| States of Brazil | 0 | - | 4.97 | 87,415 |
| Colombia Country Quiz | 0 | - | 4.90 | 40,593 |
| 15 Largest Cities in North America With a Map | 0 | - | 4.98 | 46,954 |
| 100 Biggest Cities in North America on a Map | 0 | - | 4.84 | 61,967 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,183 |
| Biggest Cities in the U.S. - Extreme | 0 | - | 4.96 | 158,905 |
