| U.S. Presidents by Picture | 0 | - | 4.87 | 427,932 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,738 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,101 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,718,407 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,879 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,880 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 194,204 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,199 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,924 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,310 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,480 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,582 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,254 |
| Presidential Actors | 0 | - | 4.36 | 19,226 |
| U.S. President Scramble | 0 | - | 4.40 | 117,340 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,511 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,537 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,868 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,072 |
| Random U.S. States on a Map | 0 | - | 4.96 | 629,129 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 235,038 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,469 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,170 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,039 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,399 |
| Presidential Middle Names | 0 | - | 4.41 | 60,591 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,563 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,797 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,565 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,142 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,435 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,969 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,028 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,761 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,326 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,715 |
| First Ladies of the United States | 0 | - | 4.28 | 85,853 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,279 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,381 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,312 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,061 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,754 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,529 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,911 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,026 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,231 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,560 |
| United States Map Quiz | 0 | - | 4.98 | 4,167,567 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,764 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,723 |
| The John Adams Presidency | 0 | - | 4.12 | 8,770 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,759 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,896 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 303,450 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,134 |
| The George Washington Presidency | 0 | - | 4.03 | 14,589 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,970 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,356 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,738 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,870 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,375 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,579 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,055 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,763 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,587 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,916 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,798 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,763 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,169 |
| US States Quiz | 0 | - | 5.00 | 16,960,648 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,055 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,072 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,634 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,473 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,612 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,370 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,026 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,288 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,329 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,146 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,272 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,751 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,473 |
| Pixelated United States Map | 0 | - | 4.88 | 94,648 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,257 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,236 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,130 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,045 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,850 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,591 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,538 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,328 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,784 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 112,001 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,015 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,659 |
| U.S. States that Start with M | 0 | - | 4.93 | 188,017 |
| U.S. States By Population | 0 | - | 4.92 | 153,960 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,986 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,756 |
| US States with an Empty Map | 0 | - | 5.00 | 627,432 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,941 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,230 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,707 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,441 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,952 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,505 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,070 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,563 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,756 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,552 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,889 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,518 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,503 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,578 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,255 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,710 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,452 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,955 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 55,077 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,326 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,570 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,330 |
| Rivers of the United States | 0 | - | 4.93 | 66,536 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,967 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,312 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,632 |
| The Kennedy Family | 0 | - | 3.90 | 14,091 |
| American Founding Fathers | 0 | - | 4.42 | 23,258 |
| American Revolution Decoder | 0 | - | 4.12 | 20,981 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,895 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,456 |
| People on Money - United States | 0 | - | 4.31 | 63,403 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,557 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,175 |
| Events in U.S. History | 0 | - | 4.41 | 28,780 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,172 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,767 |
| The Most Recent... United States | 0 | - | 4.46 | 18,542 |
| The American Civil War | 0 | - | 4.62 | 52,583 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 509,081 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,104 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,112 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,941 |
| Cartoon Versions of U.S. States | 0 | - | 4.75 | 64,088 |
| Draw All US State Borders | 0 | - | 4.99 | 139,818 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,679 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,298 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,641 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,275 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,912 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,132 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 79,053 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,771 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,887 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,237 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,422 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,379 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,921 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 238,022 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,369 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,229 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,734 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,773 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 221,761 |
| Names of Generations | 0 | - | 4.09 | 45,382 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,542 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,254 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,799 |
| The American Revolution | 0 | - | 4.52 | 54,324 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,223 |
| History of Florida | 0 | - | 4.45 | 9,863 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,129 |
| Hawaiian Islands | 0 | - | 4.83 | 42,853 |
| History of Texas | 0 | - | 4.43 | 14,676 |
| LeBron James Trivia | 0 | - | 4.01 | 171,413 |
| LeBron... or Kobe? | 0 | - | 4.04 | 70,349 |
| History of Pennsylvania | 0 | - | 4.16 | 7,159 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,460 |
| History of Virginia | 0 | - | 4.31 | 11,630 |
| American History Quotes #1 | 0 | - | 4.37 | 96,166 |
| American History Quotes #2 | 0 | - | 4.38 | 41,483 |
| Old West History | 0 | - | 4.34 | 15,292 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,530 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,972 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,313 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,551,643 |
| U.S. State Flags | 0 | - | 4.89 | 172,142 |
| U.S. States that Border Canada | 0 | - | 4.91 | 186,178 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,018 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 135,268 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,351 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,057 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,082 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,188 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,496 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.98 | 74,968 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,776 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,185 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 126,507 |
