| First Names of U.S. Presidents | 0 | - | 4.86 | 381,122 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,688,901 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,150 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,679 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,635 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 193,395 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,119 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,652 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,378 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,152 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 24,920 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,472 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,170 |
| Presidential Actors | 0 | - | 4.36 | 19,155 |
| U.S. President Scramble | 0 | - | 4.40 | 116,647 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,439 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,477 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,806 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,003 |
| Random U.S. States on a Map | 0 | - | 4.96 | 625,206 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 234,172 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,370 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,538 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,266 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,607 |
| Presidential Middle Names | 0 | - | 4.41 | 60,109 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,194 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,450 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,358 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,944 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,871 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,793 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,848 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,070 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,241 |
| First Ladies of the United States | 0 | - | 4.28 | 85,543 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,203 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,955 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,164 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,938 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,528 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,146 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,797 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,928 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,198 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,540 |
| United States Map Quiz | 0 | - | 4.98 | 4,154,246 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,603 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,715 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,618 |
| The John Adams Presidency | 0 | - | 4.12 | 8,735 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,727 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,835 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 302,003 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,034 |
| The George Washington Presidency | 0 | - | 4.03 | 14,537 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,920 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,300 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,659 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,503 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,438 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,287 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,599 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,258 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,366 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,193 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,660 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,343 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,743 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,825 |
| US States Quiz | 0 | - | 5.00 | 16,834,943 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,823 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,911 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,144 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,308 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,717 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,633 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,622 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,632 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,154 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,801 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,340 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,204 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 243,277 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 331,112 |
| Pixelated United States Map | 0 | - | 4.87 | 94,092 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,362 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,534 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,063 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,803 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,755 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,090 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,280 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,936 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,650 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,181 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,219 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,717 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,984 |
| U.S. States By Population | 0 | - | 4.92 | 153,017 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,204 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,324 |
| US States with an Empty Map | 0 | - | 5.00 | 623,361 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,394 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,619 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,147 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,112 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,474 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,791 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,555 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,049 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,429 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,122 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,388 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 53,950 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,935 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,743 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,535 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,109 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,256 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,568 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,688 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,110 |
| Rivers of the United States | 0 | - | 4.93 | 66,078 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,162 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,564 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,580 |
| The Kennedy Family | 0 | - | 3.90 | 14,060 |
| American Founding Fathers | 0 | - | 4.42 | 23,202 |
| American Revolution Decoder | 0 | - | 4.10 | 20,941 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,117 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,976 |
| People on Money - United States | 0 | - | 4.31 | 63,322 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,408 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,994 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,092 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,708 |
| The Most Recent... United States | 0 | - | 4.45 | 18,408 |
| The American Civil War | 0 | - | 4.62 | 52,374 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 505,558 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,401 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,454 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,239 |
| Cartoon Versions of U.S. States | 0 | - | 4.77 | 63,821 |
| Draw All US State Borders | 0 | - | 4.99 | 136,668 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,488 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,417 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,811 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,604 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,341 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,836 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 78,277 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,747 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,922 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,175 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,504 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,944 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,393 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,202 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,706 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,479 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,109 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,078 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,349 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 219,244 |
| Names of Generations | 0 | - | 4.10 | 44,246 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,997 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,052 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,645 |
| The American Revolution | 0 | - | 4.52 | 54,216 |
| Stephen Curry Quiz | 0 | - | 4.37 | 66,810 |
| History of Florida | 0 | - | 4.45 | 9,812 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,099 |
| Hawaiian Islands | 0 | - | 4.83 | 42,655 |
| History of Texas | 0 | - | 4.43 | 14,607 |
| LeBron James Trivia | 0 | - | 4.01 | 170,656 |
| LeBron... or Kobe? | 0 | - | 4.04 | 69,767 |
| History of Pennsylvania | 0 | - | 4.16 | 7,129 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,273 |
| History of Virginia | 0 | - | 4.31 | 11,589 |
| American History Quotes #1 | 0 | - | 4.37 | 95,962 |
| American History Quotes #2 | 0 | - | 4.38 | 41,373 |
| Old West History | 0 | - | 4.33 | 15,259 |
| Events in U.S. History | 0 | - | 4.40 | 28,623 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,517 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,916 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,216 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,534,144 |
| U.S. State Flags | 0 | - | 4.89 | 169,775 |
| U.S. States that Border Canada | 0 | - | 4.91 | 184,385 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,366 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,866 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,018 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,744 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,649 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,264 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,078 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,262 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,763 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,700 |
