| U.S. Presidents by Picture | 0 | - | 4.87 | 423,482 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,639 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,714 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,651,545 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,451 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.49 | 28,575 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,467 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,013 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,686 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,294 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,364 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,082 |
| U.S. President Scramble | 0 | - | 4.40 | 116,167 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,809 |
| Presidential Actors | 0 | - | 4.36 | 19,052 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,246 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,130 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,847 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,356 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,897 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,419 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,959 |
| Presidential Middle Names | 0 | - | 4.41 | 59,667 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,025 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,699 |
| Assassinated U.S. Presidents | 0 | - | 4.61 | 93,776 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,152 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,722 |
| George Bush... or George Bush | 0 | - | 3.98 | 8,177 |
| Random U.S. Presidents by Picture | 0 | - | 4.39 | 65,779 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,436 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,204 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,161 |
| First Ladies of the United States | 0 | - | 4.28 | 85,222 |
| The Bill Clinton Presidency | 0 | - | 4.22 | 31,349 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,415 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,714 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 21,917 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,105 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,231 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,994 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,824 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.19 | 33,348 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,650 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,678 |
| The American Revolution | 0 | - | 4.52 | 54,045 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,189 |
| Vietnam War Countries | 0 | - | 4.83 | 93,574 |
| United States Map Quiz | 0 | - | 4.98 | 4,140,737 |
| U.S. Senators by State | 0 | - | 4.44 | 39,739 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,456 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,654 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,487 |
| 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 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 233,111 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.69 | 19,957 |
| The George Washington Presidency | 0 | - | 4.03 | 14,471 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,865 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,605 |
| The Kennedy Family | 0 | - | 3.90 | 14,022 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,768 |
| Vatican City Country Quiz | 0 | - | 4.53 | 43,979 |
| The Iraq War | 0 | - | 4.47 | 15,547 |
| George Washington... or George W. Bush? | 0 | - | 4.16 | 12,206 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,913 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,259 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,365 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,820 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 192,473 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,015 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,465 |
| US States Quiz | 0 | - | 5.00 | 16,690,114 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,260 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,857 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,354 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,315 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,048 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,962 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,203 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,789 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,635 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,634 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,602 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,092 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,508 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,742 |
| Pixelated United States Map | 0 | - | 4.89 | 93,422 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,385 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,800 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,874 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,503 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,668 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,578 |
| Six Flags Over Texas | 0 | - | 4.79 | 62,989 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,442 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,180 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,659 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,300 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,349 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,573 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,838 |
| U.S. States By Population | 0 | - | 4.92 | 152,305 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,329 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,824 |
| US States with an Empty Map | 0 | - | 5.00 | 618,475 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,867 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,168 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,498 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,735 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,835 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,826 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,052 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,446 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,048 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,640 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,793 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,326 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,716 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,108 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,446 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,180 |
| The Persian Gulf War | 0 | - | 4.02 | 8,399 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,236 |
| All Modern-Day Countries Ever Controlled by Chinese People | 0 | - | 4.82 | 54,235 |
| Most Guessed North American Teams by Sport | 0 | - | 4.28 | 63,746 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,788 |
| Rivers of the United States | 0 | - | 4.93 | 65,466 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,348 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,479 |
| U.S. Presidents True or False | 0 | - | 3.96 | 15,524 |
| American Founding Fathers | 0 | - | 4.41 | 23,070 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,257 |
| California A-Z | 0 | - | 4.49 | 28,701 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,479 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,404 |
| People on Money - United States | 0 | - | 4.31 | 63,199 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,227 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,713 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 32,983 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,641 |
| The Most Recent... United States | 0 | - | 4.45 | 18,274 |
| The American Civil War | 0 | - | 4.62 | 52,116 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,541 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,510 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,570 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,519 |
| Cartoon Versions of U.S. States | 0 | - | 4.77 | 63,509 |
| Draw All US State Borders | 0 | - | 4.99 | 133,370 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,821 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,599 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 90,988 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,036 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,904 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,524 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,630 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,855 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,422 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,468 |
| All Modern-Day Countries Ever Controlled by French People | 0 | - | 4.99 | 57,489 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,799 |
| Ultimate Harry Potter Name Game | 0 | - | 4.94 | 491,290 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,143 |
| Most-Visited Countries by Popes | 0 | - | 4.55 | 83,139 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,170 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,737 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,686 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,373 |
| Colonies of Africa with a Map | 0 | - | 4.77 | 53,917 |
| Random American Countries on a Map | 0 | - | 4.96 | 98,579 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 216,509 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,367 |
| Most Common High School Mascots | 0 | - | 4.47 | 31,809 |
| History of Florida | 0 | - | 4.45 | 9,760 |
| The Life of Martin Luther King Jr. | 0 | - | 4.73 | 11,053 |
| Hawaiian Islands | 0 | - | 4.83 | 42,418 |
| Top 10 Boston Celtics Players | 0 | - | 4.05 | 23,576 |
| Boston Celtics Trivia | 0 | - | 4.09 | 14,531 |
| Top 15 New York Yankees of All-Time | 0 | - | 4.02 | 25,648 |
| History of Texas | 0 | - | 4.43 | 14,548 |
| History of Pennsylvania | 0 | - | 4.16 | 7,086 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,073 |
| History of Virginia | 0 | - | 4.31 | 11,555 |
| American History Quotes #1 | 0 | - | 4.37 | 95,674 |
| American History Quotes #2 | 0 | - | 4.38 | 41,221 |
| Old West History | 0 | - | 4.33 | 15,220 |
| Events in U.S. History | 0 | - | 4.40 | 28,463 |
| Life of Benjamin Franklin | 0 | - | 4.24 | 6,488 |
| American Revolution - Multiple Choice | 0 | - | 4.34 | 19,844 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,069 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,517,328 |
| U.S. State Flags | 0 | - | 4.89 | 166,894 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,310 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,294 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,380 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,623 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,412 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,635 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,286 |
