| Deadliest U.S. Wars | 0 | - | 4.89 | 189,393 |
| US States Quiz | 0 | - | 5.00 | 16,718,876 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,445 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,209 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,735 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,300 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 241,229 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,560 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,687 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,475 |
| Pixelated United States Map | 0 | - | 4.89 | 93,575 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,586 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,943 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,543 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,848 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,467 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,511 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,795 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,055 |
| U.S. States By Population | 0 | - | 4.92 | 152,462 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,514 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,932 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,625 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,801 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,959 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,445 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,839 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,517 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,700 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,690 |
| US States with an Empty Map | 0 | - | 5.00 | 619,453 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,155 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,986 |
| Countries that Beat Canada | 0 | - | 4.90 | 86,919 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 94,848 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,061 |
| American Founding Fathers | 0 | - | 4.41 | 23,083 |
| People on Money - United States | 0 | - | 4.31 | 63,219 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,269 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,752 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,924 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,971 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,775 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,174 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,592 |
| States of Mexico | 0 | - | 4.95 | 173,610 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,915 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,689 |
| Events in U.S. History | 0 | - | 4.40 | 28,503 |
| Capitals of Canadian Provinces | 0 | - | 4.85 | 88,489 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,300 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,486 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,087 |
| United States Country Quiz | 0 | - | 4.43 | 100,703 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,634 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,659,159 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,457 |
| Canada Country Quiz | 0 | - | 4.55 | 131,813 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,687 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,682 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,761 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,263 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,590 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 207,997 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,769 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,766 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,626 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,209 |
| American History Quotes #1 | 0 | - | 4.37 | 95,715 |
| American History Quotes #2 | 0 | - | 4.38 | 41,237 |
| New England States | 0 | - | 4.51 | 59,715 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,520 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,895 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,373 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,683 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,685 |
| U.S. States by Borders | 0 | - | 4.63 | 35,102 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 182,916 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,263 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,167 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,014 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,117 |
| Most-Visited Countries by Canadians | 0 | - | 4.77 | 39,129 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,535 |
| United States Map Quiz | 0 | - | 4.98 | 4,143,437 |
| Rivers of the United States | 0 | - | 4.93 | 65,590 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,404 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,509 |
| History of Pennsylvania | 0 | - | 4.16 | 7,093 |
| History of Virginia | 0 | - | 4.31 | 11,560 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,662 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,457 |
| Canada or Africa by Area | 0 | - | 4.77 | 18,095 |
| Flags of North and South America | 0 | - | 4.99 | 368,056 |
| Belize Country Quiz | 0 | - | 4.85 | 20,824 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,072 |
| Top U.S. Universities | 0 | - | 4.15 | 144,189 |
| Largest United States Airlines | 0 | - | 4.39 | 54,856 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,307 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 40,584 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,385 |
| U.S. States by Governor | 0 | - | 4.43 | 17,989 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,587 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,560 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,062 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,768 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,719 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,040 |
| The American Civil War | 0 | - | 4.62 | 52,183 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,686 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,462 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,708 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,302 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,047 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 52,773 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,424 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,539 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,936 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,734 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,610 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,430 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,297 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,492 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,781 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,471 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,116 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,448 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,404 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,676 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,583 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,087 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,236 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,716 |
| O Canada Lyrics | 0 | - | 4.47 | 50,800 |
| Canada Provinces Map Quiz | 0 | - | 4.99 | 636,408 |
| NHL Hockey Teams in Canada | 0 | - | 4.35 | 34,582 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,529 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,504 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,503 |
| U.S. Geography by Letter - T | 0 | - | 4.28 | 49,173 |
| U.S. Geography by Letter - P | 0 | - | 4.35 | 47,582 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,764 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,567 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,750 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,507 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,404 |
| Names of Generations | 0 | - | 4.01 | 22,244 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,800 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,376 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,959 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,194 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,768 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,172 |
| California Groups of Things | 0 | - | 4.25 | 45,286 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,209 |
| New York Groups of Things | 0 | - | 4.38 | 59,963 |
| U.S. History A-Z #1 | 0 | - | 4.35 | 29,536 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,520,664 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,634 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,469 |
| Flyover States | 0 | - | 4.52 | 29,410 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,946 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,853 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 218,737 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,673 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,213 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,988 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,027 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,593 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,344 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,155 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,683 |
| The Only American Country ... | 0 | - | 4.92 | 120,842 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,415 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,013 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,450 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,936 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,070 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,746 |
| History of Florida | 0 | - | 4.45 | 9,771 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,133 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,023 |
| History of Texas | 0 | - | 4.43 | 14,561 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,547 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,091 |
| Regions of U.S. States | 0 | - | 4.37 | 43,513 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,344 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,500 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,773 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,206 |
| Movies by State | 0 | - | 4.27 | 40,453 |
| Canada A-Z | 0 | - | 4.73 | 32,668 |
| Ontario Cities Map Quiz | 0 | - | 4.64 | 19,351 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,061 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,515 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,551 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,200 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,107 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,010 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,752 |
