| Deadliest U.S. Wars | 0 | - | 4.89 | 192,090 |
| US States Quiz | 0 | - | 5.00 | 17,031,814 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,974 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,633 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,617 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 176,010 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 247,232 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,197 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,854 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 336,551 |
| Pixelated United States Map | 0 | - | 4.89 | 95,040 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,813 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,660 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,535 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,250 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,491 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,504 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,586 |
| U.S. States that Start with M | 0 | - | 4.94 | 188,646 |
| U.S. States By Population | 0 | - | 4.92 | 154,308 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,432 |
| U.S. States with Longest Names | 0 | - | 4.85 | 45,018 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 89,020 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,619 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,252 |
| Most-Visited Countries by Canadians | 0 | - | 4.83 | 39,680 |
| Countries Closest to Canada | 0 | - | 4.91 | 199,722 |
| 10 Longest Rivers in the United States | 0 | - | 4.86 | 39,478 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,457 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,998 |
| Events in U.S. History | 0 | - | 4.41 | 28,869 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,495 |
| US States with an Empty Map | 0 | - | 5.00 | 629,870 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,619 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,137 |
| Countries that Beat Canada | 0 | - | 4.90 | 99,167 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,469 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,680 |
| American Founding Fathers | 0 | - | 4.42 | 23,309 |
| People on Money - United States | 0 | - | 4.31 | 63,519 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,640 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.09 | 54,209 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,972 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,107 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,758 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 93,044 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,307 |
| States of Mexico | 0 | - | 4.96 | 178,941 |
| Mexico States Map Quiz | 0 | - | 4.85 | 105,847 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,970 |
| Capitals of Canadian Provinces | 0 | - | 4.85 | 89,874 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,237 |
| Mexico Cities Map Quiz | 0 | - | 4.83 | 38,902 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,817 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,702 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,301 |
| United States Country Quiz | 0 | - | 4.43 | 102,391 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 77,117 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,107 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,626 |
| Canada Country Quiz | 0 | - | 4.55 | 133,227 |
| Canada Cities Map Quiz | 0 | - | 4.64 | 124,726 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,271 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,181 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 58,646 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 750,542 |
| Names of Generations | 0 | - | 4.09 | 45,627 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 210,812 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,503 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,220 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.43 | 60,179 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,571 |
| American History Quotes #1 | 0 | - | 4.37 | 96,263 |
| American History Quotes #2 | 0 | - | 4.38 | 41,546 |
| New England States | 0 | - | 4.51 | 59,916 |
| U.S. States by Land Area | 0 | - | 4.55 | 53,127 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 38,142 |
| Add a Letter - Make a U.S. State | 0 | - | 4.70 | 83,256 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 56,353 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.75 | 41,201 |
| U.S. States by Borders | 0 | - | 4.61 | 35,522 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 189,422 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,732 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 102,418 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,493 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,049 |
| Asian Last Names in the United States | 0 | - | 4.43 | 47,037 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,316 |
| Rivers of the United States | 0 | - | 4.93 | 66,836 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,383 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,741 |
| History of Pennsylvania | 0 | - | 4.16 | 7,178 |
| History of Virginia | 0 | - | 4.33 | 11,651 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 50,332 |
| Flags of North and South America | 0 | - | 4.99 | 378,492 |
| Belize Country Quiz | 0 | - | 4.85 | 21,129 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,327 |
| Top U.S. Universities | 0 | - | 4.15 | 146,055 |
| Largest United States Airlines | 0 | - | 4.39 | 55,191 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,365 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,147 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,930 |
| U.S. States by Governor | 0 | - | 4.43 | 18,130 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,790 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,816 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,012 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,921 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 56,313 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,690 |
| The American Civil War | 0 | - | 4.62 | 52,675 |
| U.S. License Plates Picture Quiz | 0 | - | 4.61 | 53,206 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.64 | 66,194 |
| U.S. States that Border Canada | 0 | - | 4.91 | 187,182 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,701 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.70 | 61,611 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,948 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.43 | 32,576 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,514 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.75 | 35,143 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,361 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,993 |
| Longest U.S. State Borders | 0 | - | 4.69 | 40,217 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,735 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,796 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 68,002 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.54 | 65,080 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,502 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,117 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,588 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,856 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,859 |
| U.S. States with the Fewest Borders | 0 | - | 4.78 | 114,594 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,389 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,569 |
| O Canada Lyrics | 0 | - | 4.47 | 51,095 |
| Canada Provinces Map Quiz | 0 | - | 4.99 | 645,645 |
| NHL Hockey Teams in Canada | 0 | - | 4.35 | 35,260 |
| Georgia ... or Georgia? | 0 | - | 4.68 | 77,116 |
| Canada or Africa by Area | 0 | - | 4.78 | 18,642 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 74,715 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 63,774 |
| U.S. Geography by Letter - D | 0 | - | 4.09 | 57,734 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 50,485 |
| U.S. Geography by Letter - P | 0 | - | 4.40 | 54,643 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 53,804 |
| U.S. Geography by Letter - L | 0 | - | 4.08 | 41,754 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 39,890 |
| U.S. Geography by Letter - R | 0 | - | 4.22 | 37,103 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 40,839 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,051 |
| American Legal Vocabulary | 0 | - | 4.40 | 34,056 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,772 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,342 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,510 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,009 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,759 |
| California Groups of Things | 0 | - | 4.26 | 45,815 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,331 |
| New York Groups of Things | 0 | - | 4.39 | 72,418 |
| U.S. History A-Z #1 | 0 | - | 4.36 | 30,597 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,559,483 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 75,138 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,582 |
| Flyover States | 0 | - | 4.53 | 29,624 |
| U.S. States With Double Letters | 0 | - | 4.55 | 24,314 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.28 | 76,473 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,883 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 135,939 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,484 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.48 | 37,213 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 129,062 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.46 | 119,397 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,717 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,549 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,839 |
| The Only American Country ... | 0 | - | 4.92 | 122,402 |
| American Countries with the Shortest Names | 0 | - | 4.97 | 121,817 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,993 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,037 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 76,111 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,120 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,991 |
| History of Florida | 0 | - | 4.45 | 9,891 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,323 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,089 |
| History of Texas | 0 | - | 4.43 | 14,707 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,353 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,379 |
| Regions of U.S. States | 0 | - | 4.37 | 44,288 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,434 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,649 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,951 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,391 |
| Movies by State | 0 | - | 4.27 | 40,622 |
| Canada A-Z | 0 | - | 4.73 | 33,003 |
| Ontario Cities Map Quiz | 0 | - | 4.64 | 19,582 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,645 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,252 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,093 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,081 |
