| Deadliest U.S. Wars | 0 | - | 4.89 | 189,264 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,691 |
| The Iraq War | 0 | - | 4.47 | 15,556 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,787 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,187 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,875 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,680 |
| The American Revolution | 0 | - | 4.52 | 54,058 |
| The Persian Gulf War | 0 | - | 4.02 | 8,402 |
| Vietnam War Countries | 0 | - | 4.83 | 93,617 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,422 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,686 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,925 |
| The Vietnam War | 0 | - | 4.43 | 35,297 |
| Battle to Country | 0 | - | 4.91 | 52,529 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,529 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,654,835 |
| The American Civil War | 0 | - | 4.62 | 52,162 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,568 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,934 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,388 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,427 |
| California A-Z | 0 | - | 4.49 | 28,708 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,878 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,665 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,556 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,420 |
| Countries in World War I | 0 | - | 4.88 | 226,623 |
| India A-Z | 0 | - | 4.42 | 33,922 |
| Australia A-Z | 0 | - | 4.54 | 49,785 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,994 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,302 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,883 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,670 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,816 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,593 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,483 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,014 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,477 |
| Germany A-Z | 0 | - | 4.56 | 62,320 |
| Italy A-Z | 0 | - | 4.49 | 57,725 |
| British History A-Z #1 | 0 | - | 4.45 | 45,824 |
| China A-Z | 0 | - | 4.55 | 66,733 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,380 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,089 |
| U.S. President Scramble | 0 | - | 4.40 | 116,207 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,027 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,696 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,731 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,457 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,751 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,359 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,907 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,366 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,100 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,092 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,962 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,005 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,343 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,665 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,877 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,184 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,943 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,739 |
| U.S. Senators by State | 0 | - | 4.45 | 39,757 |
| History of Florida | 0 | - | 4.45 | 9,764 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,082 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,627 |
| History of Texas | 0 | - | 4.43 | 14,554 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,501 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,078 |
| US States Quiz | 0 | - | 5.00 | 16,702,075 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,288 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,253 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,123 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,224 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,268 |
| Monarchies of Europe | 0 | - | 4.90 | 97,327 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,562 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,184 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,953 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,430 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,421 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,117 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,022 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,955 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,890 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,294 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,495 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,256 |
| Monarchies of Asia | 0 | - | 4.97 | 70,610 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,730 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,571 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,434 |
| Japan A-Z | 0 | - | 4.40 | 41,825 |
| Countries in World War II | 0 | - | 4.54 | 904,605 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,687 |
| Hindu Countries | 0 | - | 4.86 | 49,587 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,182 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,103 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,809 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,051 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 39,875 |
| Pixelated United States Map | 0 | - | 4.89 | 93,491 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,480 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,860 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,424 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,348 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,587 |
| Presidential Actors | 0 | - | 4.36 | 19,066 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,214 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,258 |
| History of California | 0 | - | 4.40 | 18,695 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,179 |
| History of Illinois | 0 | - | 4.24 | 11,176 |
| History of Maryland | 0 | - | 4.06 | 6,648 |
| History of Massachusetts | 0 | - | 4.14 | 8,330 |
| History of Michigan | 0 | - | 4.26 | 6,902 |
| New York City A-Z | 0 | - | 4.18 | 32,194 |
| History of New York | 0 | - | 4.36 | 16,282 |
| History of New Jersey | 0 | - | 4.38 | 7,206 |
| History of Ohio | 0 | - | 4.14 | 7,307 |
| History of Tennessee | 0 | - | 4.29 | 7,632 |
| History of Washington State | 0 | - | 4.27 | 6,839 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,487 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,498 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,743 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,921 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,373 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,425 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,681 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,922 |
| U.S. States By Population | 0 | - | 4.92 | 152,380 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,410 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,869 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,189 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 52,144 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,596 |
| US States with an Empty Map | 0 | - | 5.00 | 618,879 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,908 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,559 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,767 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,889 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,275 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,481 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,887 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,086 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,498 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,073 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,662 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,435 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,092 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,411 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,108 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,940 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,841 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,562 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,722 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,160 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,113 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,958 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,976 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,498 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,641 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,847 |
| Name the English Monarchs | 0 | - | 4.92 | 497,946 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,317 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,546 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,220 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,282 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,734 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,456 |
| Important Cities in WWII | 0 | - | 4.42 | 92,886 |
| WWII First Names | 0 | - | 4.44 | 41,562 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,365 |
| Name a World Capital A-Z | 0 | - | 5.00 | 174,983 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,360 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 26,870 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,977 |
| Top U.S. Universities | 0 | - | 4.15 | 144,089 |
| Rivers of the United States | 0 | - | 4.93 | 65,523 |
| U.S. States by Governor | 0 | - | 4.43 | 17,984 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,573 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,169 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,549 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,947 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,957 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,509 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,005 |
| Presidential Middle Names | 0 | - | 4.41 | 59,712 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,744 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,823 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,746 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,176 |
| American Founding Fathers | 0 | - | 4.41 | 23,074 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,319 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,503 |
| Hawaiian Islands | 0 | - | 4.83 | 42,430 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,448 |
| Harvard University | 0 | - | 4.15 | 8,263 |
