| First Names of U.S. Presidents | 0 | - | 4.86 | 383,534 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,435 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,850 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,724,847 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,221 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,916 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 194,679 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,891 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,093 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,925 |
| Name a Valid U.S. President #1 | 0 | - | 4.90 | 193,747 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,595 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,805 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,607 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,342 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,544 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,294 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,615 |
| Presidential Middle Names | 0 | - | 4.41 | 60,716 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,278 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,678 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,889 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,627 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,175 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,192 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,572 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 235,226 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 25,084 |
| Presidential Actors | 0 | - | 4.36 | 19,250 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,944 |
| U.S. Presidents Who Added the Most Territory | 0 | - | 4.67 | 14,234 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,959 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,360 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,841 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,765 |
| First Ladies of the United States | 0 | - | 4.28 | 85,946 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.42 | 24,065 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,312 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,462 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,358 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,093 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.31 | 58,605 |
| The Barack Obama Presidency | 0 | - | 4.14 | 25,502 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,744 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,941 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,852 |
| U.S. President Scramble | 0 | - | 4.40 | 117,453 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 29,035 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,079 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 303,895 |
| United States Map Quiz | 0 | - | 4.98 | 4,170,867 |
| The George Washington Presidency | 0 | - | 4.03 | 14,606 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,778 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,752 |
| The John Adams Presidency | 0 | - | 4.12 | 8,788 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,984 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,776 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,378 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,757 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,924 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,654 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,967 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,234 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,341 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,530 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,136 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,146 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,299 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,872 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,452 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,804 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,372 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,923 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,509 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 246,369 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 335,270 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,143 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,090 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,861 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,970 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,709 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,248 |
| US States Quiz | 0 | - | 5.00 | 16,991,129 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,596 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,331 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 85,293 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,726 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,813 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,545 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,803 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,707 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,490 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,384 |
| Pixelated United States Map | 0 | - | 4.88 | 94,794 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,512 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,424 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,191 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,630 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,146 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,646 |
| The Kennedy Family | 0 | - | 3.90 | 14,100 |
| American Revolution Decoder | 0 | - | 4.12 | 20,993 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,597 |
| Events in U.S. History | 0 | - | 4.41 | 28,819 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,192 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,399 |
| The Most Recent... United States | 0 | - | 4.46 | 18,569 |
| The American Civil War | 0 | - | 4.62 | 52,621 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,056 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 510,018 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,246 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,270 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,320 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,334 |
| U.S. States By Population | 0 | - | 4.92 | 154,114 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,198 |
| U.S. States with Longest Names | 0 | - | 4.85 | 44,873 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,268 |
| US States with an Empty Map | 0 | - | 5.00 | 628,510 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 83,055 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,845 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,532 |
| Most Common Immigrant Origin by U.S. State | 0 | - | 4.91 | 68,225 |
| Draw All US State Borders | 0 | - | 4.99 | 140,652 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,076 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,964 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,208 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,662 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,812 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,639 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,434 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,015 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,975 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 79,253 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,082 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,176 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,420 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,658 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,632 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,638 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,368 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,853 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,059 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,249 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,483 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,014 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,817 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.81 | 55,172 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,916 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,689 |
| Rivers of the United States | 0 | - | 4.93 | 66,642 |
| Names of Generations | 0 | - | 4.09 | 45,500 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,688 |
| American Founding Fathers | 0 | - | 4.42 | 23,273 |
| The American Revolution | 0 | - | 4.52 | 54,355 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,107 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,320 |
| History of Florida | 0 | - | 4.45 | 9,873 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,135 |
| Hawaiian Islands | 0 | - | 4.83 | 42,943 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,577 |
| History of Texas | 0 | - | 4.43 | 14,685 |
| LeBron James Trivia | 0 | - | 4.01 | 171,583 |
| LeBron... or Kobe? | 0 | - | 4.04 | 70,456 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,498 |
| American History Quotes #1 | 0 | - | 4.37 | 96,195 |
| People on Money - United States | 0 | - | 4.31 | 63,431 |
| American History Quotes #2 | 0 | - | 4.38 | 41,507 |
| Old West History | 0 | - | 4.34 | 15,297 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,581 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,214 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,534 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,984 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,777 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,332 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,555,143 |
| U.S. State Flags | 0 | - | 4.89 | 172,840 |
| U.S. States that Border Canada | 0 | - | 4.91 | 186,610 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,490 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,406 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,565 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 50,085 |
| Random U.S. States on a Map | 0 | - | 4.96 | 630,121 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,824 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,456 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,806 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,187 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,428 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,144 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,265 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,709 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,483 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,300 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,847 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,301 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,373 |
| The Vietnam War | 0 | - | 4.44 | 35,649 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 61,267 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 222,461 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,725 |
