| U.S. Presidents by Picture | 0 | - | 4.87 | 429,030 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,996 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 384,041 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,652 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,976 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,252 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,375 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,504 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.97 | 195,032 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,969 |
| The Barack Obama Presidency | 0 | - | 4.14 | 25,536 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,629 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,152 |
| Presidential Actors | 0 | - | 4.36 | 19,270 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,563 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,568 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,913 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,113 |
| U.S. President Scramble | 0 | - | 4.40 | 117,600 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,243 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,671 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,715 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,524 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,806 |
| Presidential Middle Names | 0 | - | 4.42 | 60,845 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,770 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,963 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,270 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,674 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 235,539 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,702 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,125 |
| Random U.S. States on a Map | 0 | - | 4.96 | 631,633 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,248 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,389 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,812 |
| First Ladies of the United States | 0 | - | 4.28 | 86,046 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,343 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,555 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,393 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,132 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,875 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,769 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 29,097 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,769 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,966 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,107 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 304,381 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,791 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,787 |
| The John Adams Presidency | 0 | - | 4.12 | 8,800 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,790 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,945 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.89 | 20,042 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,314 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,548 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.38 | 24,098 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,157 |
| The George Washington Presidency | 0 | - | 4.03 | 14,623 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 17,006 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,399 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,780 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,762 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,743 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,298 |
| U.S. State Border Crossings | 0 | - | 4.97 | 97,003 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,050 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,054 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 76,118 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,333 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,358 |
| US States Quiz | 0 | - | 5.00 | 17,034,892 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,997 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,870 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,666 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,299 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,123 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,098 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,800 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,266 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,641 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,631 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 176,039 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 247,288 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 336,623 |
| Pixelated United States Map | 0 | - | 4.89 | 95,053 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,841 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,674 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,179 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,202 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,884 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,663 |
| The Kennedy Family | 0 | - | 3.90 | 14,114 |
| American Revolution Decoder | 0 | - | 4.12 | 21,006 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,865 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,697 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,539 |
| The Most Recent... United States | 0 | - | 4.46 | 18,607 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,269 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,505 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,513 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,603 |
| U.S. States that Start with M | 0 | - | 4.94 | 188,675 |
| U.S. States By Population | 0 | - | 4.92 | 154,322 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,451 |
| U.S. States with Longest Names | 0 | - | 4.85 | 45,024 |
| US States with an Empty Map | 0 | - | 5.00 | 629,966 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 83,203 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 89,029 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,624 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,262 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 161,226 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,346 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,805 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,896 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,751 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 68,096 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.97 | 54,834 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,865 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,203 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,580 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 87,085 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,150 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,148 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.81 | 55,339 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,772 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,870 |
| 10 Longest Rivers in the United States | 0 | - | 4.86 | 39,486 |
| Rivers of the United States | 0 | - | 4.93 | 66,845 |
| Names of Generations | 0 | - | 4.09 | 45,634 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,882 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,477 |
| Countries that Beat the United States | 0 | - | 4.93 | 169,026 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,881 |
| American Founding Fathers | 0 | - | 4.42 | 23,311 |
| The American Revolution | 0 | - | 4.52 | 54,405 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,399 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,459 |
| History of Florida | 0 | - | 4.45 | 9,892 |
| Hawaiian Islands | 0 | - | 4.83 | 43,049 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,752 |
| History of Texas | 0 | - | 4.43 | 14,708 |
| LeBron James Trivia | 0 | - | 4.02 | 171,927 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,598 |
| American History Quotes #1 | 0 | - | 4.37 | 96,269 |
| People on Money - United States | 0 | - | 4.31 | 63,519 |
| American History Quotes #2 | 0 | - | 4.38 | 41,547 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,643 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.09 | 54,604 |
| Events in U.S. History | 0 | - | 4.41 | 28,870 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,227 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,814 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,379 |
| The American Civil War | 0 | - | 4.62 | 52,685 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 511,343 |
| U.S. State Flags | 0 | - | 4.88 | 173,729 |
| U.S. States that Border Canada | 0 | - | 4.91 | 187,216 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,509 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,996 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 50,350 |
| Draw All US State Borders | 0 | - | 4.99 | 141,768 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,121 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,777 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 93,066 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,631 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,146 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,311 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,580 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,868 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,489 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,627 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,708 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,702 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,077 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,663 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,476 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,238 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,691 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,701 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,620 |
| The Vietnam War | 0 | - | 4.44 | 35,700 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,980 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,169 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 223,353 |
| Territories of the United States | 0 | - | 4.80 | 52,692 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.79 | 39,949 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 176,317 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,365 |
| Major non-NATO U.S. Allies | 0 | - | 4.52 | 52,620 |
| Name a Valid Answer - United States #1 | 0 | - | 4.61 | 94,529 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,380 |
| Three Real and One Fake - U.S. History | 0 | - | 4.33 | 25,864 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,153 |
| New York City Geography | 0 | - | 4.43 | 33,210 |
| LeBron... or Kobe? | 0 | - | 4.05 | 70,621 |
| Cleveland Browns QBs Since 1999 | 0 | - | 4.31 | 7,880 |
| History of Pennsylvania | 0 | - | 4.16 | 7,180 |
| History of Virginia | 0 | - | 4.33 | 11,651 |
| Old West History | 0 | - | 4.34 | 15,311 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,540 |
