| Deadliest U.S. Wars | 0 | - | 4.89 | 190,308 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,012 |
| The Iraq War | 0 | - | 4.47 | 15,621 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,460 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,240 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,030 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,044 |
| The American Revolution | 0 | - | 4.52 | 54,180 |
| The Persian Gulf War | 0 | - | 4.02 | 8,434 |
| Vietnam War Countries | 0 | - | 4.83 | 93,977 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,897 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,044 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,511 |
| The Vietnam War | 0 | - | 4.44 | 35,451 |
| Battle to Country | 0 | - | 4.91 | 53,042 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,747 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,682,047 |
| The American Civil War | 0 | - | 4.62 | 52,334 |
| Random U.S. States on a Map | 0 | - | 4.96 | 624,441 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,170 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,423 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,772 |
| California A-Z | 0 | - | 4.49 | 28,760 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,364 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 125,248 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,763 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,519 |
| Countries in World War I | 0 | - | 4.88 | 227,662 |
| India A-Z | 0 | - | 4.42 | 34,065 |
| Australia A-Z | 0 | - | 4.54 | 49,918 |
| United States Map Quiz | 0 | - | 4.98 | 4,150,721 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,322 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,038 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,738 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,898 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,727 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,623 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,241 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,116 |
| Germany A-Z | 0 | - | 4.56 | 62,512 |
| Italy A-Z | 0 | - | 4.49 | 58,093 |
| British History A-Z #1 | 0 | - | 4.45 | 46,353 |
| China A-Z | 0 | - | 4.55 | 67,043 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,606 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,148 |
| U.S. President Scramble | 0 | - | 4.40 | 116,557 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,112 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,814 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,943 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,580 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,876 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,090 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,488 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,909 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,952 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,597 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,296 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,678 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,018 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,203 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,267 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,007 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,784 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,891 |
| U.S. Senators by State | 0 | - | 4.45 | 39,875 |
| History of Florida | 0 | - | 4.45 | 9,800 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,608 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,996 |
| History of Texas | 0 | - | 4.43 | 14,594 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,755 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,196 |
| US States Quiz | 0 | - | 5.00 | 16,808,327 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,387 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,751 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,642 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,744 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,350 |
| Monarchies of Europe | 0 | - | 4.90 | 97,825 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,238 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,418 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,720 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,001 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,141 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,605 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,495 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,196 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,586 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,066 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,755 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 120,572 |
| Monarchies of Asia | 0 | - | 4.97 | 70,907 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,520 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,213 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,720 |
| Japan A-Z | 0 | - | 4.40 | 41,955 |
| Countries in World War II | 0 | - | 4.54 | 909,732 |
| Largest City on Every Continent A-Z | 0 | - | 4.97 | 38,011 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,081 |
| Hindu Countries | 0 | - | 4.86 | 49,935 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,658 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 82,735 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,047 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,484 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,865 |
| Pixelated United States Map | 0 | - | 4.87 | 93,956 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,193 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,403 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,018 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,541 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,376 |
| Presidential Actors | 0 | - | 4.36 | 19,134 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,284 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,342 |
| History of California | 0 | - | 4.40 | 18,731 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,201 |
| History of Illinois | 0 | - | 4.24 | 11,204 |
| History of Maryland | 0 | - | 4.06 | 6,675 |
| History of Massachusetts | 0 | - | 4.14 | 8,370 |
| History of Michigan | 0 | - | 4.26 | 6,928 |
| New York City A-Z | 0 | - | 4.18 | 32,259 |
| History of New York | 0 | - | 4.36 | 16,326 |
| History of New Jersey | 0 | - | 4.38 | 7,240 |
| History of Ohio | 0 | - | 4.14 | 7,327 |
| History of Tennessee | 0 | - | 4.29 | 7,648 |
| History of Washington State | 0 | - | 4.27 | 6,861 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,840 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,578 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,524 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 504,806 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,046 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,065 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,566 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,795 |
| U.S. States By Population | 0 | - | 4.92 | 152,909 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,057 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,255 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,393 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,814 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,255 |
| US States with an Empty Map | 0 | - | 5.00 | 622,228 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,297 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,053 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,050 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,382 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,431 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,571 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,678 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,454 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,967 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,386 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,053 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,650 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,222 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,627 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,516 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,279 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,300 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,650 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,562 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,998 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,528 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,723 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,644 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,045 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,364 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,274 |
| Name the English Monarchs | 0 | - | 4.91 | 500,849 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,036 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,589 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,607 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,505 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,035 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,963 |
| Important Cities in WWII | 0 | - | 4.42 | 93,285 |
| WWII First Names | 0 | - | 4.44 | 41,714 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,494 |
| Name a World Capital A-Z | 0 | - | 5.00 | 175,686 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,743 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,065 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,186 |
| Top U.S. Universities | 0 | - | 4.15 | 144,680 |
| Rivers of the United States | 0 | - | 4.93 | 65,978 |
| Names of Generations | 0 | - | 4.10 | 42,562 |
| U.S. States by Governor | 0 | - | 4.43 | 18,028 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,638 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,304 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,626 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,415 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,091 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,454 |
| Presidential Middle Names | 0 | - | 4.41 | 60,020 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,089 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,329 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,891 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,312 |
| American Founding Fathers | 0 | - | 4.42 | 23,181 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,988 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,756 |
| Hawaiian Islands | 0 | - | 4.83 | 42,608 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,888 |
