| Deadliest U.S. Wars | 0 | - | 4.89 | 191,384 |
| US States Quiz | 0 | - | 5.00 | 16,938,303 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,001 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,207 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,991 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,059 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,273 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,987 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,493 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,783 |
| Pixelated United States Map | 0 | - | 4.88 | 94,541 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,078 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,099 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,609 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,827 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,825 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,462 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,802 |
| U.S. States By Population | 0 | - | 4.92 | 153,831 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,837 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,658 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,605 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,378 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,863 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,281 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,828 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,011 |
| Events in U.S. History | 0 | - | 4.41 | 28,740 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,952 |
| US States with an Empty Map | 0 | - | 5.00 | 626,645 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,030 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,663 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,555 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,675 |
| People on Money - United States | 0 | - | 4.31 | 63,390 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,536 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,704 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,433 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,082 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,457 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 62,061 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,246 |
| States of Mexico | 0 | - | 4.96 | 177,180 |
| Mexico States Map Quiz | 0 | - | 4.84 | 105,311 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,982 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,729 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,633 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,630 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,231 |
| United States Country Quiz | 0 | - | 4.43 | 101,851 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,991 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,713,181 |
| American Founding Fathers | 0 | - | 4.42 | 23,250 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,151 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,565 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,494 |
| Countries Closest to Canada | 0 | - | 4.91 | 198,727 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,099 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 69,760 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 53,210 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 748,495 |
| Names of Generations | 0 | - | 4.09 | 45,288 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,015 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,284 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,066 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 59,995 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,446 |
| New England States | 0 | - | 4.51 | 59,856 |
| U.S. States by Land Area | 0 | - | 4.63 | 52,939 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,058 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 82,969 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,159 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 41,039 |
| U.S. States by Borders | 0 | - | 4.62 | 35,401 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 187,056 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,596 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,195 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,294 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,656 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,875 |
| United States Map Quiz | 0 | - | 4.98 | 4,165,343 |
| History of Pennsylvania | 0 | - | 4.16 | 7,149 |
| History of Virginia | 0 | - | 4.31 | 11,615 |
| Flags of North and South America | 0 | - | 4.99 | 375,014 |
| Belize Country Quiz | 0 | - | 4.85 | 21,028 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,263 |
| Top U.S. Universities | 0 | - | 4.15 | 145,484 |
| Largest United States Airlines | 0 | - | 4.39 | 55,094 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,344 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,393 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,762 |
| U.S. States by Governor | 0 | - | 4.43 | 18,086 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,724 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,722 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,477 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,872 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,064 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,148 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,026 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,935 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,555 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,265 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,617 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,529 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,211 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 35,090 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,143 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,878 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,993 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,608 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,694 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,922 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,888 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,375 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,908 |
| Top 10 U.S. States People are Leaving | 0 | - | 4.42 | 59,602 |
| Top 10 U.S. States People are Moving To | 0 | - | 4.74 | 63,944 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,539 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,806 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,766 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,039 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,334 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,910 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,363 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,382 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,346 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,081 |
| U.S. Geography by Letter - P | 0 | - | 4.38 | 54,239 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,537 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 41,395 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,559 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 36,455 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,441 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,881 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,845 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,970 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,643 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,210 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,411 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,727 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,578 |
| California Groups of Things | 0 | - | 4.25 | 45,645 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,298 |
| New York Groups of Things | 0 | - | 4.37 | 70,079 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,755 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,945 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,550 |
| Flyover States | 0 | - | 4.52 | 29,554 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,201 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,298 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,406 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,145 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,548 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 119,208 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,589 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,846 |
| The Only American Country ... | 0 | - | 4.92 | 121,924 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,378 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,677 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,351 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,697 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,965 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,624 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,568 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,064 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,097 |
| Old West History | 0 | - | 4.34 | 15,290 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,529 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,962 |
| Regions of U.S. States | 0 | - | 4.37 | 44,034 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,403 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,609 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,888 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,332 |
| Movies by State | 0 | - | 4.27 | 40,581 |
| Canada Country Quiz | 0 | - | 4.54 | 132,774 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,425 |
| Canada A-Z | 0 | - | 4.73 | 32,912 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,894 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,062 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,272 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,464 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,265 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,501 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,673 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,502 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 52,984 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 48,980 |
| U.S. Geography by Letter - F | 0 | - | 3.84 | 45,249 |
| U.S. Geography by Letter - O | 0 | - | 3.52 | 41,722 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,585 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 54,329 |
| Brazil States Map Quiz | 0 | - | 4.86 | 48,339 |
| States of Brazil | 0 | - | 4.97 | 88,923 |
| Colombia Country Quiz | 0 | - | 4.90 | 40,851 |
| 15 Largest Cities in North America With a Map | 0 | - | 4.98 | 47,679 |
| 100 Biggest Cities in North America on a Map | 0 | - | 4.84 | 62,633 |
| Fictional Characters from the Midwest by Picture | 0 | - | 4.04 | 19,214 |
| Biggest Cities in the U.S. - Extreme | 0 | - | 4.95 | 159,692 |
| Biggest Cities in Each U.S. State - Extreme | 0 | - | 4.90 | 83,553 |
