| Deadliest U.S. Wars | 0 | - | 4.89 | 189,277 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,691 |
| The Iraq War | 0 | - | 4.47 | 15,557 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,800 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,187 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,881 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,682 |
| The American Revolution | 0 | - | 4.52 | 54,059 |
| The Persian Gulf War | 0 | - | 4.02 | 8,403 |
| Vietnam War Countries | 0 | - | 4.83 | 93,623 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,429 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,691 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 189,940 |
| The Vietnam War | 0 | - | 4.43 | 35,299 |
| Battle to Country | 0 | - | 4.91 | 52,537 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,530 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,655,222 |
| The American Civil War | 0 | - | 4.62 | 52,162 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,585 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,937 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,398 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,430 |
| California A-Z | 0 | - | 4.49 | 28,709 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,879 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,670 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,556 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,431 |
| Countries in World War I | 0 | - | 4.88 | 226,632 |
| India A-Z | 0 | - | 4.42 | 33,922 |
| Australia A-Z | 0 | - | 4.54 | 49,786 |
| United States Map Quiz | 0 | - | 4.98 | 4,142,078 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,303 |
| 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 | 23,817 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,602 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,485 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,017 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,491 |
| Germany A-Z | 0 | - | 4.56 | 62,323 |
| Italy A-Z | 0 | - | 4.49 | 57,729 |
| British History A-Z #1 | 0 | - | 4.45 | 45,866 |
| China A-Z | 0 | - | 4.55 | 66,734 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,382 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,089 |
| U.S. President Scramble | 0 | - | 4.40 | 116,209 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,027 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,697 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,732 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,484 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,770 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,372 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,913 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,371 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,110 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,097 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,964 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,012 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,351 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,670 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,881 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,191 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,976 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,742 |
| U.S. Senators by State | 0 | - | 4.45 | 39,760 |
| 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 | 65,636 |
| History of Texas | 0 | - | 4.43 | 14,554 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,504 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,078 |
| US States Quiz | 0 | - | 5.00 | 16,703,802 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,297 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,264 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,132 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,232 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,276 |
| Monarchies of Europe | 0 | - | 4.90 | 97,337 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,588 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,200 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,973 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,441 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,435 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,128 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,032 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,964 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,913 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,313 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,504 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,260 |
| Monarchies of Asia | 0 | - | 4.97 | 70,612 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,736 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,579 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,435 |
| Japan A-Z | 0 | - | 4.40 | 41,826 |
| Countries in World War II | 0 | - | 4.54 | 904,703 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,692 |
| Hindu Countries | 0 | - | 4.86 | 49,594 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,186 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,108 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,810 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,072 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 39,969 |
| Pixelated United States Map | 0 | - | 4.89 | 93,500 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,494 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,873 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,433 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,357 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,591 |
| Presidential Actors | 0 | - | 4.36 | 19,067 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,219 |
| 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 | 6,649 |
| History of Massachusetts | 0 | - | 4.14 | 8,332 |
| History of Michigan | 0 | - | 4.26 | 6,903 |
| 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 | 7,207 |
| History of Ohio | 0 | - | 4.14 | 7,308 |
| History of Tennessee | 0 | - | 4.29 | 7,634 |
| History of Washington State | 0 | - | 4.27 | 6,840 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,488 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,498 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,747 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,943 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,380 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,427 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,685 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,930 |
| U.S. States By Population | 0 | - | 4.92 | 152,385 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,419 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,875 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,191 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 52,226 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,598 |
| US States with an Empty Map | 0 | - | 5.00 | 618,918 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,912 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,564 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,767 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,894 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,277 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,484 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,890 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,089 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,500 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,073 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,666 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,436 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,093 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,414 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,112 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,947 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,853 |
| 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 | 94,737 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,171 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,117 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,965 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,987 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,510 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,659 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,852 |
| Name the English Monarchs | 0 | - | 4.92 | 498,018 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,335 |
| 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 | 69,224 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,288 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,738 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,461 |
| Important Cities in WWII | 0 | - | 4.42 | 92,890 |
| WWII First Names | 0 | - | 4.44 | 41,566 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,369 |
| Name a World Capital A-Z | 0 | - | 5.00 | 174,999 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,369 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 26,875 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 39,977 |
| Top U.S. Universities | 0 | - | 4.15 | 144,097 |
| Rivers of the United States | 0 | - | 4.93 | 65,525 |
| U.S. States by Governor | 0 | - | 4.43 | 17,984 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,574 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,172 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,551 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,950 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,960 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,514 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,008 |
| Presidential Middle Names | 0 | - | 4.41 | 59,715 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,745 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,826 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,748 |
| 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 | 123,325 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,506 |
| Hawaiian Islands | 0 | - | 4.83 | 42,432 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,452 |
| Harvard University | 0 | - | 4.15 | 8,265 |
