| First Names of U.S. Presidents | 0 | - | 4.86 | 382,499 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,285 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,536 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,711,487 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,166 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,780 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,518 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 193,981 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,852 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,053 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,814 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,758 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,376 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,666 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,550 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,241 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,992 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,796 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,169 |
| Presidential Middle Names | 0 | - | 4.41 | 60,467 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,218 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,482 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,692 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,505 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,581 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,074 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,264 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 234,803 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 24,999 |
| Presidential Actors | 0 | - | 4.36 | 19,207 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,750 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,584 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,294 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,744 |
| First Ladies of the United States | 0 | - | 4.28 | 85,780 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,987 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,253 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,298 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,250 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,013 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,435 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,345 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,803 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,865 |
| U.S. President Scramble | 0 | - | 4.40 | 117,164 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,913 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,967 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 303,125 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,692 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,687 |
| The George Washington Presidency | 0 | - | 4.03 | 14,571 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,753 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,678 |
| The John Adams Presidency | 0 | - | 4.12 | 8,764 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,952 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,751 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,338 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,715 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,873 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,502 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,833 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,221 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,782 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,167 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,909 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,919 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,276 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,651 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,173 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,825 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,963 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,663 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,982 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,114 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,589 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,114 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,968 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,836 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,496 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,463 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,074 |
| US States Quiz | 0 | - | 5.00 | 16,931,657 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,923 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,851 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,870 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,216 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,421 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,220 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,362 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,137 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,157 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,264 |
| Pixelated United States Map | 0 | - | 4.88 | 94,516 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,042 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,068 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,778 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,941 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,125 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,620 |
| The Kennedy Family | 0 | - | 3.90 | 14,084 |
| American Revolution Decoder | 0 | - | 4.10 | 20,973 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,476 |
| Events in U.S. History | 0 | - | 4.41 | 28,731 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,144 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,230 |
| The Most Recent... United States | 0 | - | 4.46 | 18,515 |
| The American Civil War | 0 | - | 4.62 | 52,513 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,183 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 508,235 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,796 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,730 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,425 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,745 |
| U.S. States By Population | 0 | - | 4.92 | 153,810 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,802 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,633 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,909 |
| US States with an Empty Map | 0 | - | 5.00 | 626,422 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,740 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,574 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,357 |
| Draw All US State Borders | 0 | - | 4.99 | 139,054 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,836 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,336 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,981 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,448 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,699 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,476 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,003 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,645 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,774 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 78,837 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,491 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,619 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,727 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,181 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,391 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,362 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,131 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,578 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,802 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,809 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,169 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,836 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,619 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,992 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,577 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,467 |
| Rivers of the United States | 0 | - | 4.93 | 66,394 |
| Names of Generations | 0 | - | 4.09 | 45,260 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,411 |
| American Founding Fathers | 0 | - | 4.42 | 23,248 |
| The American Revolution | 0 | - | 4.52 | 54,297 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,688 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,125 |
| History of Florida | 0 | - | 4.45 | 9,848 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,118 |
| Hawaiian Islands | 0 | - | 4.83 | 42,798 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,316 |
| History of Texas | 0 | - | 4.43 | 14,662 |
| LeBron James Trivia | 0 | - | 4.01 | 171,250 |
| LeBron... or Kobe? | 0 | - | 4.04 | 70,221 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,406 |
| American History Quotes #1 | 0 | - | 4.37 | 96,121 |
| People on Money - United States | 0 | - | 4.31 | 63,383 |
| American History Quotes #2 | 0 | - | 4.38 | 41,460 |
| Old West History | 0 | - | 4.34 | 15,288 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,526 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,144 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,529 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,962 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,752 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,288 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,546,856 |
| U.S. State Flags | 0 | - | 4.89 | 171,551 |
| U.S. States that Border Canada | 0 | - | 4.91 | 185,744 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,621 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,596 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,752 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,725 |
| Random U.S. States on a Map | 0 | - | 4.96 | 628,279 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,393 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,042 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,410 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 62,048 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,276 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,952 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,866 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,287 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,274 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,731 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,721 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,055 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,059 |
| The Vietnam War | 0 | - | 4.44 | 35,591 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 60,857 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 221,122 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,624 |
| Territories of the United States | 0 | - | 4.80 | 52,489 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,622 |
