| Deadliest U.S. Wars | 0 | - | 4.89 | 189,780 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,752 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,130 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,730 |
| US States Quiz | 0 | - | 5.00 | 16,778,748 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,723 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,125 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,573 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,045 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,248 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,680 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,903 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,790 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,336 |
| Pixelated United States Map | 0 | - | 4.89 | 93,813 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,007 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,244 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,349 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,919 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,914 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,356 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,583 |
| U.S. States By Population | 0 | - | 4.92 | 152,785 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,887 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,162 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,953 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,975 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,255 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,943 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,818 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,083 |
| US States with an Empty Map | 0 | - | 5.00 | 621,354 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,407 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,200 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,117 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,326 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,506 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,388 |
| American Founding Fathers | 0 | - | 4.42 | 23,111 |
| People on Money - United States | 0 | - | 4.31 | 63,262 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,828 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,923 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,218 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,081 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,516 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,691 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,608 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,722 |
| States of Mexico | 0 | - | 4.95 | 174,671 |
| Mexico States Map Quiz | 0 | - | 4.84 | 104,185 |
| Events in U.S. History | 0 | - | 4.40 | 28,569 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,516 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,128 |
| United States Country Quiz | 0 | - | 4.43 | 101,037 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,727 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,673,790 |
| California Groups of Things | 0 | - | 4.25 | 45,338 |
| New York Groups of Things | 0 | - | 4.38 | 60,020 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,710 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,851 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,177 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,728 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,791 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,972 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,463 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 745,178 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 208,445 |
| Name a Valid U.S. City over 100,000 | 0 | - | 4.42 | 40,104 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,848 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,727 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,246 |
| American History Quotes #1 | 0 | - | 4.37 | 95,824 |
| American History Quotes #2 | 0 | - | 4.38 | 41,303 |
| New England States | 0 | - | 4.51 | 59,755 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,633 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,949 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,558 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.70 | 55,820 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,787 |
| U.S. States by Borders | 0 | - | 4.63 | 35,191 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 183,871 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,361 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,815 |
| Movies by State | 0 | - | 4.27 | 40,491 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 44,080 |
| United States Map Quiz | 0 | - | 4.98 | 4,148,390 |
| History of Pennsylvania | 0 | - | 4.16 | 7,110 |
| History of Virginia | 0 | - | 4.31 | 11,575 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 39,006 |
| Georgia ... or Georgia? | 0 | - | 4.67 | 76,583 |
| Flags of North and South America | 0 | - | 4.99 | 370,113 |
| Belize Country Quiz | 0 | - | 4.85 | 20,879 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,118 |
| Top U.S. Universities | 0 | - | 4.15 | 144,511 |
| Largest United States Airlines | 0 | - | 4.39 | 54,925 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,316 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,663 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,502 |
| U.S. States by Governor | 0 | - | 4.43 | 18,015 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,620 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,604 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,978 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,787 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,830 |
| The American Civil War | 0 | - | 4.62 | 52,281 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,773 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,594 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,364 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,104 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,634 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,449 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,976 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,694 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,586 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,384 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,546 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,819 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,596 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,190 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,564 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,438 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,703 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,625 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,245 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,265 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,442 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,738 |
| U.S. Geography by Letter - A | 0 | - | 4.37 | 62,707 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,700 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,383 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,817 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,949 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,801 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,941 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,742 |
| Dominica Country Quiz | 0 | - | 4.81 | 19,744 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,541 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,840 |
| U.S. Cities by Picture #1 | 0 | - | 4.36 | 34,436 |
| Cities by Picture #2 | 0 | - | 4.19 | 35,012 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,260 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,371 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,285 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,224 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,717 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,495 |
| Flyover States | 0 | - | 4.52 | 29,448 |
| U.S. States With Double Letters | 0 | - | 4.54 | 24,013 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,968 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,266 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 37,025 |
| Musical Acts by State | 0 | - | 4.05 | 19,569 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 128,154 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,704 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,407 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,332 |
| Famous Italian-Americans | 0 | - | 4.15 | 14,394 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,203 |
| The Only American Country ... | 0 | - | 4.92 | 121,165 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,204 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,817 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,163 |
| Names of Generations | 0 | - | 4.00 | 23,083 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,683 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,455 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,038 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,690 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,144 |
| Regions of U.S. States | 0 | - | 4.37 | 43,656 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,358 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,519 |
| U.S. States with the Lowest HDI | 0 | - | 4.47 | 28,811 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,241 |
| People by U.S. State - Multiple Choice | 0 | - | 4.06 | 9,815 |
| Canada Country Quiz | 0 | - | 4.54 | 132,084 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,875 |
| Canada A-Z | 0 | - | 4.73 | 32,719 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,526 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,859 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,954 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,488 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,769 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,309 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,967 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,735 |
| Name a Valid African Country | 0 | - | 4.98 | 153,414 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,192 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 81,885 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,457 |
| U.S. Geography by Letter - N | 0 | - | 3.80 | 52,496 |
| U.S. Geography by Letter - E | 0 | - | 3.75 | 48,492 |
| U.S. Geography by Letter - F | 0 | - | 3.87 | 44,755 |
| U.S. Geography by Letter - O | 0 | - | 3.52 | 41,176 |
| U.S. Geography by Letter - R | 0 | - | 4.18 | 30,612 |
| Hispanic Last Names in the U.S. | 0 | - | 4.31 | 54,672 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,187 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,384 |
| South American Geography Quiz #2 | 0 | - | 4.61 | 39,258 |
| South American Geography Quiz #1 | 0 | - | 4.73 | 32,519 |
| All First-Level Subdivisions of South America on a Map | 0 | - | 4.92 | 53,372 |
