| Deadliest U.S. Wars | 0 | - | 4.89 | 190,310 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,016 |
| The Iraq War | 0 | - | 4.47 | 15,621 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,467 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,240 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,040 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,047 |
| The American Revolution | 0 | - | 4.52 | 54,180 |
| The Persian Gulf War | 0 | - | 4.02 | 8,434 |
| Vietnam War Countries | 0 | - | 4.83 | 93,979 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,898 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,046 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,518 |
| The Vietnam War | 0 | - | 4.44 | 35,452 |
| Battle to Country | 0 | - | 4.91 | 53,046 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,750 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,682,277 |
| The American Civil War | 0 | - | 4.62 | 52,334 |
| Random U.S. States on a Map | 0 | - | 4.96 | 624,466 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,173 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,430 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,775 |
| 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 | 125,254 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,764 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,524 |
| Countries in World War I | 0 | - | 4.88 | 227,667 |
| India A-Z | 0 | - | 4.42 | 34,065 |
| Australia A-Z | 0 | - | 4.54 | 49,920 |
| United States Map Quiz | 0 | - | 4.98 | 4,150,757 |
| 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 | 380,736 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,628 |
| 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 | 62,513 |
| Italy A-Z | 0 | - | 4.49 | 58,093 |
| British History A-Z #1 | 0 | - | 4.45 | 46,354 |
| China A-Z | 0 | - | 4.55 | 67,046 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,606 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,149 |
| U.S. President Scramble | 0 | - | 4.40 | 116,559 |
| 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 | 44,944 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,584 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,880 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,093 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,491 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,910 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,954 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,600 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,299 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,680 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,022 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,207 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,269 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,014 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,794 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,893 |
| U.S. Senators by State | 0 | - | 4.45 | 39,875 |
| History of Florida | 0 | - | 4.45 | 9,801 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,612 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,998 |
| History of Texas | 0 | - | 4.43 | 14,594 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,756 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,196 |
| US States Quiz | 0 | - | 5.00 | 16,808,937 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,393 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,758 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 126,645 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,748 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,352 |
| Monarchies of Europe | 0 | - | 4.90 | 97,831 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 232,244 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,423 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,723 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 76,003 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,142 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,610 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,495 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,200 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,593 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,069 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,756 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 120,582 |
| Monarchies of Asia | 0 | - | 4.97 | 70,908 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,523 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,217 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,720 |
| Japan A-Z | 0 | - | 4.40 | 41,956 |
| Countries in World War II | 0 | - | 4.54 | 909,752 |
| Largest City on Every Continent A-Z | 0 | - | 4.97 | 38,011 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,083 |
| Hindu Countries | 0 | - | 4.86 | 49,935 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,660 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 82,741 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,048 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,497 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,868 |
| Pixelated United States Map | 0 | - | 4.87 | 93,960 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,196 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,407 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,021 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,541 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,379 |
| Presidential Actors | 0 | - | 4.36 | 19,135 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,284 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,343 |
| History of California | 0 | - | 4.40 | 18,732 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,202 |
| History of Illinois | 0 | - | 4.24 | 11,205 |
| History of Maryland | 0 | - | 4.06 | 6,675 |
| History of Massachusetts | 0 | - | 4.14 | 8,371 |
| History of Michigan | 0 | - | 4.26 | 6,929 |
| New York City A-Z | 0 | - | 4.18 | 32,259 |
| History of New York | 0 | - | 4.36 | 16,327 |
| 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 | 6,862 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,841 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,578 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,526 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 504,825 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,052 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,067 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,572 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,797 |
| U.S. States By Population | 0 | - | 4.92 | 152,911 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,062 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,258 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,394 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,821 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,259 |
| US States with an Empty Map | 0 | - | 5.00 | 622,239 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,297 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,056 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,053 |
| 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 | 40,572 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,679 |
| 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 | 124,971 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,386 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,054 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,651 |
| 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 | 101,517 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,281 |
| 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 | 95,569 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,001 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,532 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,727 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,649 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,049 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,369 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,276 |
| Name the English Monarchs | 0 | - | 4.91 | 500,864 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,038 |
| 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 | 69,608 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,505 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,036 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,965 |
| Important Cities in WWII | 0 | - | 4.42 | 93,288 |
| WWII First Names | 0 | - | 4.44 | 41,715 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,497 |
| Name a World Capital A-Z | 0 | - | 5.00 | 175,692 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,745 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,065 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,187 |
| Top U.S. Universities | 0 | - | 4.15 | 144,684 |
| Rivers of the United States | 0 | - | 4.93 | 65,980 |
| Names of Generations | 0 | - | 4.10 | 42,643 |
| U.S. States by Governor | 0 | - | 4.43 | 18,030 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,641 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,305 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,628 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,418 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,095 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,460 |
| Presidential Middle Names | 0 | - | 4.41 | 60,028 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,092 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,330 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,893 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,314 |
| American Founding Fathers | 0 | - | 4.42 | 23,181 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,989 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,758 |
| Hawaiian Islands | 0 | - | 4.83 | 42,609 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,889 |
