| First Names of U.S. Presidents | 0 | - | 4.85 | 379,820 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,130 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,756 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,660,406 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,039 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,489 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 192,683 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,729 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 21,930 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,507 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,115 |
| Random U.S. Presidents by Picture | 0 | - | 4.39 | 65,883 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,383 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,372 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,039 |
| U.S. Vice Presidents | 0 | - | 4.41 | 135,173 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,050 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,638 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,095 |
| Presidential Middle Names | 0 | - | 4.41 | 59,768 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,092 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,817 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,911 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,200 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,548 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,770 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,506 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 233,373 |
| Presidential Actors | 0 | - | 4.36 | 19,077 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,172 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,507 |
| First Ladies of the United States | 0 | - | 4.28 | 85,288 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,825 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,123 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,435 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,020 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,848 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,269 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,413 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,683 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,701 |
| U.S. President Scramble | 0 | - | 4.40 | 116,275 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.49 | 28,629 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,722 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 300,254 |
| United States Map Quiz | 0 | - | 4.98 | 4,143,806 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,490 |
| The George Washington Presidency | 0 | - | 4.03 | 14,482 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,666 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,523 |
| The John Adams Presidency | 0 | - | 4.12 | 8,683 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,882 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,689 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,235 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,617 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,785 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,057 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,421 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,183 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,791 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,957 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,309 |
| Most-Visited Countries by Popes | 0 | - | 4.55 | 83,249 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,223 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,033 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,025 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,262 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,472 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,763 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,956 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,346 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 241,296 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,623 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,895 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,565 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,675 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,158 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,714 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,559 |
| US States Quiz | 0 | - | 5.00 | 16,724,404 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,489 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,095 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,551 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,583 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,229 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,133 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,100 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,503 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,764 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,843 |
| Pixelated United States Map | 0 | - | 4.89 | 93,596 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,626 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,963 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,551 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,728 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 19,965 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,539 |
| The Kennedy Family | 0 | - | 3.90 | 14,027 |
| American Revolution Decoder | 0 | - | 4.10 | 20,886 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,048 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,013 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,558 |
| The Most Recent... United States | 0 | - | 4.45 | 18,314 |
| The American Civil War | 0 | - | 4.62 | 52,187 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,874 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 502,515 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,498 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,541 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,831 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,084 |
| U.S. States By Population | 0 | - | 4.92 | 152,482 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,531 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,954 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,716 |
| US States with an Empty Map | 0 | - | 5.00 | 619,580 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,958 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,664 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,804 |
| Draw All US State Borders | 0 | - | 4.99 | 134,075 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,970 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,024 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,142 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,567 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,118 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,719 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,170 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,001 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,903 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 94,893 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,095 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,620 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,860 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 53,542 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,462 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,198 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,606 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,924 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,517 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,305 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,332 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,789 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,355 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,550 |
| Rivers of the United States | 0 | - | 4.93 | 65,605 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,516 |
| American Founding Fathers | 0 | - | 4.41 | 23,085 |
| The American Revolution | 0 | - | 4.52 | 54,085 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,437 |
| Stephen Curry Quiz | 0 | - | 4.36 | 66,434 |
| History of Florida | 0 | - | 4.45 | 9,771 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,066 |
| Hawaiian Islands | 0 | - | 4.83 | 42,470 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,524 |
| History of Texas | 0 | - | 4.43 | 14,561 |
| LeBron James Trivia | 0 | - | 4.01 | 170,027 |
| LeBron... or Kobe? | 0 | - | 4.04 | 69,297 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,118 |
| American History Quotes #1 | 0 | - | 4.37 | 95,722 |
| People on Money - United States | 0 | - | 4.31 | 63,224 |
| American History Quotes #2 | 0 | - | 4.38 | 41,241 |
| Old West History | 0 | - | 4.33 | 15,231 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,275 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,757 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,496 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,861 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,657 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,095 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,521,268 |
| U.S. State Flags | 0 | - | 4.89 | 167,716 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,792 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,983 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 218,779 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,706 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,691 |
| Random U.S. States on a Map | 0 | - | 4.96 | 622,238 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,994 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,806 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,198 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,602 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,725 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,578 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 88,150 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,610 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,705 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,332 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 101,439 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,941 |
| The Vietnam War | 0 | - | 4.43 | 35,325 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 59,573 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 54,021 |
| Random Sequential African Countries on a Map | 0 | - | 5.00 | 126,857 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 217,140 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,315 |
| Territories of the United States | 0 | - | 4.79 | 52,183 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,488 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.78 | 39,417 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 174,679 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,307 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,095 |
| Names of Generations | 0 | - | 4.01 | 22,453 |
