| U.S. Presidents Quiz | 0 | - | 5.00 | 3,650,853 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,435 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,634 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,426 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,690 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,431 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,825 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,889 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,403 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,945 |
| Presidential Middle Names | 0 | - | 4.41 | 59,660 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,692 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,275 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,769 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,721 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,150 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,349 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,012 |
| Random U.S. Presidents by Picture | 0 | - | 4.39 | 65,777 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,681 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,347 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.49 | 28,572 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,461 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,160 |
| First Ladies of the United States | 0 | - | 4.28 | 85,215 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,809 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,102 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,213 |
| U.S. President Scramble | 0 | - | 4.40 | 116,158 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,992 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,821 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,172 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,677 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,354 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,081 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,023 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,473 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,455 |
| Presidential Actors | 0 | - | 4.36 | 19,051 |
| The George Washington Presidency | 0 | - | 4.03 | 14,469 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,653 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,468 |
| The John Adams Presidency | 0 | - | 4.12 | 8,674 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,864 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,678 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,200 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,604 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,767 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,067 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,749 |
| Most-Visited Countries by Popes | 0 | - | 4.55 | 83,133 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,206 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,358 |
| 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 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 192,454 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,242 |
| US States Quiz | 0 | - | 5.00 | 16,688,054 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 233,098 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,239 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,200 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,765 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,627 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,897 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,522 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,239 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,590 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,812 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,081 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,340 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,699 |
| Pixelated United States Map | 0 | - | 4.89 | 93,414 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,363 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,785 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,874 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,498 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,667 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 19,956 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,524 |
| The Kennedy Family | 0 | - | 3.90 | 14,021 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,006 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,570 |
| Six Flags Over Texas | 0 | - | 4.79 | 62,988 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,459 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,430 |
| The Most Recent... United States | 0 | - | 4.45 | 18,271 |
| The American Civil War | 0 | - | 4.62 | 52,110 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,637 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,454 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,286 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,332 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,559 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,821 |
| U.S. States By Population | 0 | - | 4.92 | 152,294 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,316 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,813 |
| US States with an Empty Map | 0 | - | 5.00 | 618,414 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,859 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,150 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,487 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,730 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,821 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,814 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,048 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,432 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,041 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,630 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,781 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,838 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,341 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,302 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,038 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,952 |
| All Modern-Day Countries Ever Controlled by Greeks | 0 | - | 4.98 | 53,407 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,322 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,705 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,098 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,442 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,167 |
| Vatican City Country Quiz | 0 | - | 4.53 | 43,977 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,232 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,228 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,782 |
| Rivers of the United States | 0 | - | 4.93 | 65,452 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,357 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,331 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,456 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,177 |
| American Founding Fathers | 0 | - | 4.41 | 23,065 |
| The American Revolution | 0 | - | 4.52 | 54,042 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,244 |
| History of Florida | 0 | - | 4.45 | 9,759 |
| Hawaiian Islands | 0 | - | 4.83 | 42,417 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,396 |
| History of Texas | 0 | - | 4.43 | 14,547 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,071 |
| American History Quotes #1 | 0 | - | 4.37 | 95,671 |
| People on Money - United States | 0 | - | 4.31 | 63,199 |
| American History Quotes #2 | 0 | - | 4.38 | 41,220 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,224 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,708 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 32,982 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,636 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,067 |
| U.S. State Flags | 0 | - | 4.89 | 166,863 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,269 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,499 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,534 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,192 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,353 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,506 |
| Cartoon Versions of U.S. States | 0 | - | 4.77 | 63,506 |
| Draw All US State Borders | 0 | - | 4.99 | 133,324 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,813 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,588 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 90,977 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,021 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,898 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,521 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,616 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,615 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,401 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,843 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 87,973 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,416 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,462 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,485 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,386 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,279 |
| Biggest Roman Empire Countries | 0 | - | 4.87 | 101,330 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,793 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,125 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,164 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,728 |
| The Vietnam War | 0 | - | 4.43 | 35,283 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,678 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,369 |
| U.S. States Closest to Tokyo | 0 | - | 4.89 | 59,362 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,907 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 216,470 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,247 |
| Territories of the United States | 0 | - | 4.79 | 52,113 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,464 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.78 | 39,360 |
| Most Mentioned Enemies of the USA | 0 | - | 4.77 | 174,474 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,300 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,072 |
| United States Country Quiz | 0 | - | 4.43 | 100,519 |
| Major non-NATO U.S. Allies | 0 | - | 4.52 | 51,706 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,586 |
| Name a Valid Answer - United States #1 | 0 | - | 4.61 | 93,407 |
| Most Common High School Mascots | 0 | - | 4.47 | 31,803 |
| Three Real and One Fake - U.S. History | 0 | - | 4.33 | 25,676 |
| Win the U.S. Presidential Election | 0 | - | 4.80 | 617,895 |
| History of California | 0 | - | 4.40 | 18,690 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,175 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,052 |
| History of Illinois | 0 | - | 4.24 | 11,174 |
