| U.S. Presidents by Picture | 0 | - | 4.87 | 427,896 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,732 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,073 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,878 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,717,937 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,252 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,199 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,298 |
| Presidents that Beat Thomas Jefferson | 0 | - | 4.49 | 25,055 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,909 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,877 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 194,189 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,581 |
| The Bill Clinton Presidency | 0 | - | 4.24 | 31,506 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,536 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,868 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 22,072 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,286 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,466 |
| Presidential Actors | 0 | - | 4.36 | 19,226 |
| U.S. President Scramble | 0 | - | 4.40 | 117,332 |
| Random U.S. Presidents by Picture | 0 | - | 4.40 | 66,474 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,159 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,033 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,391 |
| Presidential Middle Names | 0 | - | 4.41 | 60,587 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,560 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,793 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,141 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,564 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 235,026 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,425 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,023 |
| Random U.S. States on a Map | 0 | - | 4.96 | 629,084 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,750 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,326 |
| U.S. Presidential Running Mates | 0 | - | 4.41 | 28,712 |
| First Ladies of the United States | 0 | - | 4.28 | 85,844 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,278 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,373 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,310 |
| Add a Letter - Make a U.S. President | 0 | - | 4.58 | 24,060 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,749 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,966 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,523 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,909 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,025 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,550 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 303,425 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,764 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,719 |
| 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 | 12,893 |
| Colonies of the Americas in 1775 with a Map | 0 | - | 4.88 | 19,859 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,286 |
| United States Map Quiz | 0 | - | 4.98 | 4,167,337 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 20,133 |
| The George Washington Presidency | 0 | - | 4.03 | 14,588 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,967 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,355 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,737 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,354 |
| Vatican City Country Quiz | 0 | - | 4.53 | 44,575 |
| Most-Visited Countries by Popes | 0 | - | 4.56 | 84,046 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,752 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,566 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,915 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,789 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 74,751 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,164 |
| US States Quiz | 0 | - | 5.00 | 16,958,136 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,201 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,038 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,045 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,576 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,460 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,592 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,357 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,022 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,319 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,132 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,247 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,708 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,392 |
| Pixelated United States Map | 0 | - | 4.88 | 94,639 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,240 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,220 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,129 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,033 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,849 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,631 |
| The Kennedy Family | 0 | - | 3.90 | 14,090 |
| American Revolution Decoder | 0 | - | 4.12 | 20,980 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,581 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,535 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,324 |
| The Most Recent... United States | 0 | - | 4.46 | 18,540 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,762 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,972 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,984 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,635 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,987 |
| U.S. States By Population | 0 | - | 4.92 | 153,941 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,968 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,743 |
| US States with an Empty Map | 0 | - | 5.00 | 627,358 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,933 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,696 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,437 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,948 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,495 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,064 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,559 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,749 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,551 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,880 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 54,500 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,490 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,553 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,241 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,698 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,418 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,946 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 55,071 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,313 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,562 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,324 |
| Rivers of the United States | 0 | - | 4.93 | 66,528 |
| Names of Generations | 0 | - | 4.09 | 45,366 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,532 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,953 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,296 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,797 |
| American Founding Fathers | 0 | - | 4.42 | 23,257 |
| The American Revolution | 0 | - | 4.52 | 54,320 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,881 |
| Stephen Curry Quiz | 0 | - | 4.37 | 67,220 |
| History of Florida | 0 | - | 4.45 | 9,862 |
| Hawaiian Islands | 0 | - | 4.83 | 42,849 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,450 |
| History of Texas | 0 | - | 4.43 | 14,676 |
| LeBron James Trivia | 0 | - | 4.01 | 171,406 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,457 |
| American History Quotes #1 | 0 | - | 4.37 | 96,166 |
| People on Money - United States | 0 | - | 4.31 | 63,401 |
| American History Quotes #2 | 0 | - | 4.38 | 41,482 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,555 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,173 |
| Events in U.S. History | 0 | - | 4.41 | 28,777 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,172 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,767 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,312 |
| The American Civil War | 0 | - | 4.62 | 52,578 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 509,019 |
| U.S. State Flags | 0 | - | 4.89 | 172,104 |
| U.S. States that Border Canada | 0 | - | 4.91 | 186,149 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,083 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,981 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 49,927 |
| Draw All US State Borders | 0 | - | 4.99 | 139,716 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,665 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,286 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 92,628 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,263 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,907 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,128 |
| Draw All US State Borders - Extreme | 0 | - | 4.99 | 79,034 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 58,343 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,741 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,047 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,869 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,214 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,404 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 58,366 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 102,176 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,913 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 238,001 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,361 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 83,221 |
| The Vietnam War | 0 | - | 4.44 | 35,621 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,724 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,756 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,834 |
| U.S. History Multiple Choice #5 | 0 | - | 4.26 | 11,585 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 221,713 |
| Territories of the United States | 0 | - | 4.80 | 52,549 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.79 | 39,814 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 175,930 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,351 |
| Major non-NATO U.S. Allies | 0 | - | 4.52 | 52,395 |
| Name a Valid Answer - United States #1 | 0 | - | 4.62 | 94,267 |
| Most Common High School Mascots | 0 | - | 4.47 | 32,249 |
| Three Real and One Fake - U.S. History | 0 | - | 4.33 | 25,818 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,129 |
| New York City Geography | 0 | - | 4.43 | 33,163 |
| LeBron... or Kobe? | 0 | - | 4.04 | 70,340 |
| Cleveland Browns QBs Since 1999 | 0 | - | 4.31 | 7,848 |
| History of Pennsylvania | 0 | - | 4.16 | 7,158 |
| History of Virginia | 0 | - | 4.31 | 11,630 |
