| U.S. Presidents Quiz | 0 | - | 5.00 | 3,719,611 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,042 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,763 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,207 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,410 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,509 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,891 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,221 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,126 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,473 |
| Presidential Middle Names | 0 | - | 4.41 | 60,627 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,579 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,832 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,162 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,591 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.30 | 52,005 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,970 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,472 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,306 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,808 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,342 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,735 |
| First Ladies of the United States | 0 | - | 4.28 | 85,878 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,203 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,287 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,397 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,888 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,325 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,071 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,921 |
| Presidential Actors | 0 | - | 4.36 | 19,232 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,038 |
| U.S. President Scramble | 0 | - | 4.40 | 117,361 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,049 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,590 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,585 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,806 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,259 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,516 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,540 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,874 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,078 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,767 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,730 |
| The John Adams Presidency | 0 | - | 4.12 | 8,777 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,765 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,905 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,984 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,883 |
| United States Map Quiz | 0 | - | 4.98 | 4,168,211 |
| The George Washington Presidency | 0 | - | 4.03 | 14,593 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,975 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,367 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,744 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,409 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,843 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,783 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,626 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,929 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,821 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 194,246 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,480 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,828 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,180 |
| US States Quiz | 0 | - | 5.00 | 16,965,995 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,314 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,114 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,116 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,775 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,527 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,652 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,414 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,044 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,293 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,351 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,190 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,323 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,886 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,687 |
| Pixelated United States Map | 0 | - | 4.88 | 94,671 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,318 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,275 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,132 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,052 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,853 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,138 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,637 |
| The Kennedy Family | 0 | - | 3.90 | 14,091 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,610 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,552 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,338 |
| The Most Recent... United States | 0 | - | 4.46 | 18,545 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,835 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 112,066 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,074 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,767 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,083 |
| U.S. States By Population | 0 | - | 4.92 | 153,995 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,027 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,777 |
| US States with an Empty Map | 0 | - | 5.00 | 627,622 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,960 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,745 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,458 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,978 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,524 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,095 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,580 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,771 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,569 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,911 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,546 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,527 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,629 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,278 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,735 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,493 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,589 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,074 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,974 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 55,092 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,353 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,592 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,341 |
| Rivers of the United States | 0 | - | 4.93 | 66,564 |
| Names of Generations | 0 | - | 4.09 | 45,416 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,563 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,004 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,367 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,232 |
| American Founding Fathers | 0 | - | 4.42 | 23,264 |
| The American Revolution | 0 | - | 4.52 | 54,328 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,943 |
| History of Florida | 0 | - | 4.45 | 9,866 |
| Hawaiian Islands | 0 | - | 4.83 | 42,877 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,480 |
| History of Texas | 0 | - | 4.43 | 14,678 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,470 |
| American History Quotes #1 | 0 | - | 4.37 | 96,170 |
| People on Money - United States | 0 | - | 4.31 | 63,411 |
| American History Quotes #2 | 0 | - | 4.38 | 41,486 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,566 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,180 |
| Events in U.S. History | 0 | - | 4.41 | 28,786 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,177 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,767 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,318 |
| The American Civil War | 0 | - | 4.62 | 52,591 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 509,229 |
| U.S. State Flags | 0 | - | 4.89 | 172,258 |
| U.S. States that Border Canada | 0 | - | 4.91 | 186,265 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,133 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,239 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,973 |
| Draw All US State Borders | 0 | - | 4.99 | 140,045 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,709 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,327 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,683 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,315 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,943 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,152 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 79,086 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,361 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,821 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,099 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,934 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,290 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,471 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,400 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,206 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,952 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,066 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,396 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,255 |
| The Vietnam War | 0 | - | 4.44 | 35,628 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,755 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,804 |
| U.S. History Multiple Choice #5 | 0 | - | 4.26 | 11,585 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 221,889 |
| Territories of the United States | 0 | - | 4.80 | 52,565 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.79 | 39,831 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 175,964 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,354 |
| Major non-NATO U.S. Allies | 0 | - | 4.52 | 52,426 |
| Name a Valid Answer - United States #1 | 0 | - | 4.62 | 94,294 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,266 |
| Three Real and One Fake - U.S. History | 0 | - | 4.33 | 25,825 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,132 |
| New York City Geography | 0 | - | 4.43 | 33,170 |
| History of Pennsylvania | 0 | - | 4.16 | 7,160 |
| History of Virginia | 0 | - | 4.33 | 11,635 |
| Old West History | 0 | - | 4.34 | 15,292 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,530 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,975 |
| U.S. History Multiple Choice #2 | 0 | - | 4.32 | 25,113 |
| U.S. History Multiple Choice #1 | 0 | - | 4.29 | 22,278 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,588 |
| U.S. History Multiple Choice #4 | 0 | - | 4.24 | 25,651 |
| Animals in American History | 0 | - | 4.20 | 28,091 |
| U.S. History Analogies | 0 | - | 4.31 | 17,543 |
