| U.S. Presidents Quiz | 0 | - | 5.00 | 3,651,209 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,457 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,638 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,443 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,703 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,466 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,837 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,894 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,409 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,952 |
| Presidential Middle Names | 0 | - | 4.41 | 59,661 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,698 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,773 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,150 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,347 |
| Random U.S. Presidents by Picture | 0 | - | 4.39 | 65,779 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,024 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,284 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,721 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,434 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,358 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,012 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,160 |
| First Ladies of the United States | 0 | - | 4.28 | 85,218 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,102 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,221 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,992 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,823 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,677 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,355 |
| Presidential Actors | 0 | - | 4.36 | 19,051 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,081 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,809 |
| U.S. President Scramble | 0 | - | 4.40 | 116,163 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.49 | 28,573 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,685 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,181 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,455 |
| The Bill Clinton Presidency | 0 | - | 4.22 | 31,344 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,413 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,712 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 21,916 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,653 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,486 |
| The John Adams Presidency | 0 | - | 4.12 | 8,674 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,679 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,767 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,617 |
| The George Washington Presidency | 0 | - | 4.03 | 14,469 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,864 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,202 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,604 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,243 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,758 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,202 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,206 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,905 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,247 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,362 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,816 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,874 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,668 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 192,461 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,012 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,464 |
| US States Quiz | 0 | - | 5.00 | 16,689,201 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,158 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,254 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,850 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,347 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,307 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,046 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,956 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,779 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,632 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,581 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,786 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,595 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,089 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,409 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,725 |
| Pixelated United States Map | 0 | - | 4.89 | 93,416 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,372 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,793 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,338 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,468 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,503 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 19,957 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,524 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,177 |
| The Kennedy Family | 0 | - | 3.90 | 14,021 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,573 |
| Six Flags Over Texas | 0 | - | 4.79 | 62,989 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 32,982 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,435 |
| The Most Recent... United States | 0 | - | 4.45 | 18,273 |
| The American Civil War | 0 | - | 4.62 | 52,113 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,650 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,499 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,293 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,343 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,566 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,827 |
| U.S. States By Population | 0 | - | 4.92 | 152,299 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,323 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,817 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,507 |
| US States with an Empty Map | 0 | - | 5.00 | 618,447 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,865 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,494 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,731 |
| Draw All US State Borders | 0 | - | 4.99 | 133,346 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,830 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,819 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,049 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,439 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,044 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,635 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,029 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,903 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,789 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,627 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,849 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,418 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,464 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 53,411 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,323 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,708 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,105 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,444 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,176 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,797 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,136 |
| Vatican City Country Quiz | 0 | - | 4.53 | 43,978 |
| Most-Visited Countries by Popes | 0 | - | 4.55 | 83,136 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,168 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,234 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,682 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,232 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,371 |
| Rivers of the United States | 0 | - | 4.93 | 65,461 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,363 |
| U.S. Presidents by State | 0 | - | 4.34 | 68,477 |
| American Founding Fathers | 0 | - | 4.41 | 23,069 |
| The American Revolution | 0 | - | 4.52 | 54,042 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,252 |
| History of Florida | 0 | - | 4.45 | 9,759 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,053 |
| Hawaiian Islands | 0 | - | 4.83 | 42,417 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,400 |
| History of Texas | 0 | - | 4.43 | 14,547 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,072 |
| American History Quotes #1 | 0 | - | 4.37 | 95,673 |
| People on Money - United States | 0 | - | 4.31 | 63,199 |
| American History Quotes #2 | 0 | - | 4.38 | 41,220 |
| Old West History | 0 | - | 4.33 | 15,220 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,225 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,710 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,488 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,843 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,638 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,068 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,517,208 |
| U.S. State Flags | 0 | - | 4.89 | 166,878 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,292 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,553 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,241 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,368 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,513 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,098 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,818 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,595 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 90,981 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,524 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,620 |
| Name a Valid U.S. President by Birth State | 0 | - | 4.60 | 9,660 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,409 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,628 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,281 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 87,980 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,487 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,389 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,280 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 101,332 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 124,644 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,736 |
| The Vietnam War | 0 | - | 4.43 | 35,284 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,835 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,146 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,911 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,516 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,067 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 216,497 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,248 |
| Territories of the United States | 0 | - | 4.79 | 52,117 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,465 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.78 | 39,362 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 742,938 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 174,482 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,301 |
