| Deadliest U.S. Wars | 0 | - | 4.89 | 189,218 |
| US States Quiz | 0 | - | 5.00 | 16,694,340 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,212 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,805 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,622 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,116 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,800 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,507 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,605 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,849 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,193 |
| Pixelated United States Map | 0 | - | 4.89 | 93,443 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,425 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,819 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,692 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,326 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,373 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,617 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,870 |
| U.S. States By Population | 0 | - | 4.92 | 152,329 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,364 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,837 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,527 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,747 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,861 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,792 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,376 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,518 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,542 |
| US States with an Empty Map | 0 | - | 5.00 | 618,607 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,070 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,921 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,665 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,888 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,617 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,840 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,628 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,018 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,534 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,463 |
| States of Mexico | 0 | - | 4.95 | 173,288 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,759 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,255 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,468 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,074 |
| United States Country Quiz | 0 | - | 4.43 | 100,555 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,592 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,652,739 |
| American Founding Fathers | 0 | - | 4.41 | 23,071 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,121 |
| California Groups of Things | 0 | - | 4.25 | 45,264 |
| Los Angeles vs. New York | 0 | - | 4.41 | 19,632 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,202 |
| Famous People from New York by Picture | 0 | - | 4.03 | 27,344 |
| New York Groups of Things | 0 | - | 4.38 | 59,935 |
| People on Money - United States | 0 | - | 4.31 | 63,202 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,235 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,725 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,325 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,643 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,527 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,072 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,052 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 207,805 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,694 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,732 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,580 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,018 |
| New England States | 0 | - | 4.51 | 59,704 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,469 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,881 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,301 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,621 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,655 |
| U.S. States by Borders | 0 | - | 4.63 | 35,063 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 182,452 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,228 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,124 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 43,982 |
| Countries that Beat Canada | 0 | - | 4.90 | 86,832 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,499 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,221 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,284 |
| Geography of California | 0 | - | 4.25 | 10,498 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,422 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,799 |
| History of Pennsylvania | 0 | - | 4.16 | 7,087 |
| History of Virginia | 0 | - | 4.31 | 11,555 |
| Events in U.S. History | 0 | - | 4.40 | 28,470 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,402 |
| Flags of North and South America | 0 | - | 4.99 | 366,840 |
| Belize Country Quiz | 0 | - | 4.85 | 20,797 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,042 |
| Top U.S. Universities | 0 | - | 4.15 | 144,030 |
| Largest United States Airlines | 0 | - | 4.39 | 54,832 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,301 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 38,920 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,336 |
| U.S. States by Governor | 0 | - | 4.43 | 17,979 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,570 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,545 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,585 |
| Famous People from Alabama by Picture | 0 | - | 4.07 | 23,946 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,751 |
| Hawaiian Islands | 0 | - | 4.83 | 42,424 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,682 |
| Famous People from Michigan by Picture | 0 | - | 4.30 | 21,288 |
| State Quiz - New York | 0 | - | 4.52 | 45,729 |
| Boroughs of New York City | 0 | - | 4.47 | 84,083 |
| Famous People from Texas by Picture | 0 | - | 3.99 | 33,254 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,000 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,080 |
| The Life of Thomas Edison | 0 | - | 4.03 | 4,893 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,656 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,392 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,270 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,023 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 51,384 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,411 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,455 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,926 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,674 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,568 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,369 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,263 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,468 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,762 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,410 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,074 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,391 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,386 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,663 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,561 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,011 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,225 |
| U.S. Geography by Letter - C | 0 | - | 4.26 | 73,338 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,309 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,303 |
| U.S. Geography by Letter - T | 0 | - | 4.27 | 48,987 |
| U.S. Geography by Letter - P | 0 | - | 4.34 | 47,377 |
| U.S. Geography by Letter - M | 0 | - | 4.13 | 52,588 |
| U.S. Geography by Letter - L | 0 | - | 4.03 | 40,350 |
| U.S. Geography by Letter - G | 0 | - | 4.12 | 38,593 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,321 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,370 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,787 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,351 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,931 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,154 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,498 |
| Musical Acts from Los Angeles by Two Songs | 0 | - | 4.27 | 15,817 |
| Movies Set in San Francisco | 0 | - | 4.23 | 19,906 |
| Movies Set in Miami | 0 | - | 4.32 | 16,672 |
| Musical Acts from New York City | 0 | - | 3.82 | 10,099 |
| History of New York | 0 | - | 4.36 | 16,279 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,596 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,461 |
| Flyover States | 0 | - | 4.52 | 29,387 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,906 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,794 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,189 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,973 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 127,981 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,554 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,305 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,304 |
| The Only American Country ... | 0 | - | 4.92 | 120,725 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,313 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,934 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,286 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,846 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,774 |
| History of Florida | 0 | - | 4.45 | 9,761 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,040 |
| History of Texas | 0 | - | 4.43 | 14,551 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,470 |
| Regions of U.S. States | 0 | - | 4.37 | 43,459 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,338 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,491 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,762 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,195 |
| Movies by State | 0 | - | 4.27 | 40,438 |
| Canada Country Quiz | 0 | - | 4.54 | 131,688 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,589 |
| Canada A-Z | 0 | - | 4.73 | 32,641 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,895 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,384 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,068 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,835 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,646 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,066 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,079 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,058 |
| U.S. Geography by Letter - N | 0 | - | 3.79 | 52,146 |
| U.S. Geography by Letter - E | 0 | - | 3.73 | 48,188 |
| U.S. Geography by Letter - F | 0 | - | 3.86 | 44,442 |
| U.S. Geography by Letter - O | 0 | - | 3.43 | 33,790 |
| U.S. Geography by Letter - R | 0 | - | 4.15 | 30,265 |
| Mexico Country Quiz | 0 | - | 4.49 | 71,960 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,313 |
