| First Names of U.S. Presidents | 0 | - | 4.86 | 384,012 |
| Places Mentioned in the Song "Kokomo" | 0 | - | 4.44 | 17,093 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,733,218 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.97 | 195,023 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,093 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 235,526 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 304,358 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,374 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 429,014 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.89 | 20,035 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,053 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,627 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,251 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,961 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,125 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,991 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,872 |
| US States Quiz | 0 | - | 5.00 | 17,032,455 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,846 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,994 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,635 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,044 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,619 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 76,113 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 176,017 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 247,244 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 336,564 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,199 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,670 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,324 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,858 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,355 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,983 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,650 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,264 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,101 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,085 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,791 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,182 |
| Real Madrid 2010s Starting XI | 0 | - | 4.90 | 69,177 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,133 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,760 |
| 10 Longest Rivers in the United States | 0 | - | 4.86 | 39,478 |
| Rivers of the United States | 0 | - | 4.93 | 66,840 |
| Pixelated United States Map | 0 | - | 4.89 | 95,044 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,821 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,664 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,461 |
| Countries that Beat the United States | 0 | - | 4.93 | 169,008 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,711 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,878 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,512 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,800 |
| Presidential Middle Names | 0 | - | 4.42 | 60,838 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,562 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,565 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,912 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,112 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,768 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,959 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,267 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,669 |
| American Founding Fathers | 0 | - | 4.42 | 23,309 |
| The American Revolution | 0 | - | 4.52 | 54,403 |
| American Revolution Decoder | 0 | - | 4.12 | 21,006 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,386 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,742 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,692 |
| LeBron James Trivia | 0 | - | 4.02 | 171,919 |
| People on Money - United States | 0 | - | 4.31 | 63,519 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,640 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.09 | 54,264 |
| Events in U.S. History | 0 | - | 4.41 | 28,869 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,227 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,813 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,536 |
| The Most Recent... United States | 0 | - | 4.46 | 18,607 |
| The American Civil War | 0 | - | 4.62 | 52,677 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,252 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 511,285 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,495 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,506 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,589 |
| U.S. States that Start with M | 0 | - | 4.94 | 188,653 |
| U.S. States By Population | 0 | - | 4.92 | 154,311 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,438 |
| U.S. States with Longest Names | 0 | - | 4.85 | 45,019 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,499 |
| US States with an Empty Map | 0 | - | 5.00 | 629,891 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 210,982 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 83,201 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 50,335 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 89,024 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,619 |
| Draw All US State Borders | 0 | - | 4.99 | 141,724 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,256 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,108 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 161,220 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,344 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,761 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,800 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,892 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,745 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 93,046 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,623 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,140 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 68,093 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,307 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,474 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,686 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,693 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,064 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,649 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.97 | 54,818 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 61,855 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,570 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 87,079 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,233 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,677 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,691 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,142 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,612 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,967 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.81 | 55,329 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,164 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,861 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 223,310 |
| Names of Generations | 0 | - | 4.09 | 45,629 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,871 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,375 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,179 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,884 |
| U.S. Vice Presidents | 0 | - | 4.39 | 137,240 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,387 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,809 |
| First Ladies of the United States | 0 | - | 4.28 | 86,043 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,342 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,551 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,481 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,392 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,696 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,131 |
| Win the 1828 U.S. Presidential Election | 0 | - | 4.32 | 59,733 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,974 |
| Star-Spangled Banner Lyrics | 0 | - | 4.36 | 180,025 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,456 |
| History of Florida | 0 | - | 4.45 | 9,891 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,152 |
| Hawaiian Islands | 0 | - | 4.83 | 43,046 |
| History of Texas | 0 | - | 4.43 | 14,707 |
| LeBron... or Kobe? | 0 | - | 4.05 | 70,616 |
| History of Pennsylvania | 0 | - | 4.16 | 7,179 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,593 |
| History of Virginia | 0 | - | 4.33 | 11,651 |
| American History Quotes #1 | 0 | - | 4.37 | 96,265 |
| American History Quotes #2 | 0 | - | 4.38 | 41,546 |
| Old West History | 0 | - | 4.34 | 15,311 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,540 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 20,000 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,379 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,769 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,559,530 |
| U.S. State Flags | 0 | - | 4.88 | 173,690 |
| U.S. States that Border Canada | 0 | - | 4.91 | 187,188 |
| Mississippi River States Empty Map Quiz | 0 | - | 4.82 | 56,403 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,889 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 135,945 |
| Random U.S. States on a Map | 0 | - | 4.96 | 631,545 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,571 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,867 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,965 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,239 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,615 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,752 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,812 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 89,945 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,750 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,259 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 75,676 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.89 | 114,639 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,471 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 127,137 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,362 |
| The Vietnam War | 0 | - | 4.44 | 35,698 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,719 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 61,520 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 54,854 |
| Fresh Prince of Bel-Air Lyrics | 0 | - | 4.86 | 590,522 |
| Oceania Map Quiz | 0 | - | 4.98 | 660,837 |
| U.S. Geography by Letter - B | 0 | - | 4.54 | 70,181 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 58,649 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,817 |
| Territories of the United States | 0 | - | 4.80 | 52,690 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,702 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.79 | 39,945 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 750,557 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 176,307 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,365 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,301 |
| United States Country Quiz | 0 | - | 4.43 | 102,395 |
