| First Names of U.S. Presidents | 0 | - | 4.86 | 381,112 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,688,492 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,148 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,677 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,632 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 193,385 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,117 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,637 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,356 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,149 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 24,918 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,471 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,168 |
| Presidential Actors | 0 | - | 4.36 | 19,154 |
| U.S. President Scramble | 0 | - | 4.40 | 116,644 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,437 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,476 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,804 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,002 |
| Random U.S. States on a Map | 0 | - | 4.96 | 625,148 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 234,161 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,369 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,530 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,259 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,600 |
| Presidential Middle Names | 0 | - | 4.41 | 60,106 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,189 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,441 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,357 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,940 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,864 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,792 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,847 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,062 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,241 |
| First Ladies of the United States | 0 | - | 4.28 | 85,537 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,201 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,938 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,159 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,936 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,527 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,138 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,795 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,927 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,198 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,525 |
| United States Map Quiz | 0 | - | 4.98 | 4,154,119 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,601 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,715 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,617 |
| The John Adams Presidency | 0 | - | 4.12 | 8,734 |
| 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 | 301,990 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,034 |
| The George Washington Presidency | 0 | - | 4.03 | 14,535 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,918 |
| 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 | 19,500 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,435 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,285 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,593 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,258 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,360 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,179 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,658 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,335 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,742 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,823 |
| US States Quiz | 0 | - | 5.00 | 16,833,612 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,815 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,900 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,136 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,304 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,712 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,625 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,617 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,626 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,151 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,790 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,331 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,197 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 243,243 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 331,086 |
| Pixelated United States Map | 0 | - | 4.87 | 94,082 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,357 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,525 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,063 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,802 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,754 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,080 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,276 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,931 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,643 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,172 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,215 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,704 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,976 |
| U.S. States By Population | 0 | - | 4.92 | 153,012 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,196 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,320 |
| US States with an Empty Map | 0 | - | 5.00 | 623,318 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,387 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,606 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,139 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,110 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,473 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,782 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,537 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,048 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,428 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,120 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,380 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 53,945 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,928 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,733 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,530 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,104 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,246 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,565 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,685 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,108 |
| Rivers of the United States | 0 | - | 4.93 | 66,076 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,153 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,552 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,579 |
| The Kennedy Family | 0 | - | 3.90 | 14,059 |
| American Founding Fathers | 0 | - | 4.42 | 23,201 |
| American Revolution Decoder | 0 | - | 4.10 | 20,939 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,109 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,974 |
| People on Money - United States | 0 | - | 4.31 | 63,322 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,407 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,990 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,092 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,707 |
| The Most Recent... United States | 0 | - | 4.45 | 18,407 |
| The American Civil War | 0 | - | 4.62 | 52,374 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 505,512 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,390 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 208,438 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,232 |
| Cartoon Versions of U.S. States | 0 | - | 4.77 | 63,816 |
| Draw All US State Borders | 0 | - | 4.99 | 136,631 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,486 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,408 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,808 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,602 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,341 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,835 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 78,270 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,739 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,914 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,170 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,492 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,939 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,383 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,196 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,703 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,473 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,106 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,071 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,346 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 219,219 |
| Names of Generations | 0 | - | 4.10 | 44,214 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,993 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,052 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,642 |
| The American Revolution | 0 | - | 4.52 | 54,214 |
| Stephen Curry Quiz | 0 | - | 4.37 | 66,804 |
| History of Florida | 0 | - | 4.45 | 9,811 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,099 |
| Hawaiian Islands | 0 | - | 4.83 | 42,654 |
| History of Texas | 0 | - | 4.43 | 14,605 |
| LeBron James Trivia | 0 | - | 4.01 | 170,646 |
| LeBron... or Kobe? | 0 | - | 4.04 | 69,762 |
| History of Pennsylvania | 0 | - | 4.16 | 7,129 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,272 |
| History of Virginia | 0 | - | 4.31 | 11,589 |
| American History Quotes #1 | 0 | - | 4.37 | 95,959 |
| American History Quotes #2 | 0 | - | 4.38 | 41,372 |
| 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 | 19,914 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,216 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,534,009 |
| U.S. State Flags | 0 | - | 4.89 | 169,763 |
| U.S. States that Border Canada | 0 | - | 4.91 | 184,370 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,354 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,853 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,014 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,742 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,643 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,257 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,066 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,254 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,757 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 73,690 |
