| First Names of U.S. Presidents | 0 | - | 4.86 | 382,075 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,781 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,381 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,703,724 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,602 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,302 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,717 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 193,749 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,062 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,147 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,474 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,502 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,837 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,030 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,203 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,924 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,766 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,517 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,820 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,606 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 93,896 |
| Presidential Middle Names | 0 | - | 4.41 | 60,347 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,400 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,636 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,459 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,866 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,712 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,164 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,026 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,101 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 234,560 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 24,966 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,204 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,783 |
| U.S. Presidents Who Added the Most Territory | 0 | - | 4.66 | 14,123 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,371 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,270 |
| First Ladies of the United States | 0 | - | 4.28 | 85,694 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,967 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,236 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 77,192 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,225 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,985 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,932 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,844 |
| Presidential Actors | 0 | - | 4.36 | 19,188 |
| U.S. President Scramble | 0 | - | 4.40 | 116,854 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,418 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 302,719 |
| United States Map Quiz | 0 | - | 4.98 | 4,161,436 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,658 |
| The George Washington Presidency | 0 | - | 4.03 | 14,553 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,740 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,658 |
| The John Adams Presidency | 0 | - | 4.12 | 8,753 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,940 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,747 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,330 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,695 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,862 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,654 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,771 |
| Random U.S. States on a Map | 0 | - | 4.96 | 627,097 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,431 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,703 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,812 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 83,792 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,268 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,976 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,544 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,026 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,607 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,757 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,546 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,674 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,452 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 332,617 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,089 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,909 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,822 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,208 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,227 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,304 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,996 |
| US States Quiz | 0 | - | 5.00 | 16,896,531 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,282 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,573 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 82,749 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,874 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,176 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,017 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,136 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,799 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,342 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,207 |
| Pixelated United States Map | 0 | - | 4.87 | 94,365 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,826 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,883 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,567 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,650 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,087 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,613 |
| The Kennedy Family | 0 | - | 3.90 | 14,078 |
| American Revolution Decoder | 0 | - | 4.10 | 20,963 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,403 |
| Events in U.S. History | 0 | - | 4.41 | 28,691 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,123 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,120 |
| The Most Recent... United States | 0 | - | 4.45 | 18,473 |
| The American Civil War | 0 | - | 4.62 | 52,458 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,028 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 507,192 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,564 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,552 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,162 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,462 |
| U.S. States By Population | 0 | - | 4.92 | 153,645 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,582 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,519 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,724 |
| US States with an Empty Map | 0 | - | 5.00 | 625,313 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,629 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,416 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,262 |
| Draw All US State Borders | 0 | - | 4.99 | 138,081 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,708 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,179 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,877 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,338 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,620 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,364 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,856 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,544 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,661 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 78,642 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,223 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,351 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,506 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,927 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,240 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,208 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,972 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,378 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,641 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,556 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,421 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,000 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,706 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,300 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,883 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,388 |
| Rivers of the United States | 0 | - | 4.93 | 66,261 |
| Names of Generations | 0 | - | 4.09 | 45,065 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,249 |
| American Founding Fathers | 0 | - | 4.42 | 23,233 |
| The American Revolution | 0 | - | 4.52 | 54,267 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,456 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,028 |
| History of Florida | 0 | - | 4.45 | 9,832 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,108 |
| Hawaiian Islands | 0 | - | 4.83 | 42,746 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,189 |
| History of Texas | 0 | - | 4.43 | 14,642 |
| LeBron James Trivia | 0 | - | 4.01 | 171,075 |
| LeBron... or Kobe? | 0 | - | 4.04 | 70,065 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,351 |
| American History Quotes #1 | 0 | - | 4.37 | 96,066 |
| People on Money - United States | 0 | - | 4.31 | 63,355 |
| American History Quotes #2 | 0 | - | 4.38 | 41,426 |
| Old West History | 0 | - | 4.34 | 15,282 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,486 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,088 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,525 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,946 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,740 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,263 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,542,233 |
| U.S. State Flags | 0 | - | 4.88 | 170,849 |
| U.S. States that Border Canada | 0 | - | 4.91 | 185,239 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,213 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,042 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,403 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,575 |
| Cartoon Versions of U.S. States | 0 | - | 4.75 | 63,966 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,756 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,783 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,211 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,947 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,181 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,863 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,633 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,041 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,160 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,444 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,655 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 101,955 |
| Shakespeare Quotes | 0 | - | 4.43 | 71,432 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,835 |
| The Vietnam War | 0 | - | 4.44 | 35,557 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 60,604 |
