| Deadliest U.S. Wars | 0 | - | 4.89 | 191,536 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,516 |
| The Iraq War | 0 | - | 4.47 | 15,689 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,844 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,320 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,261 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,723 |
| The American Revolution | 0 | - | 4.52 | 54,318 |
| The Persian Gulf War | 0 | - | 4.02 | 8,471 |
| Vietnam War Countries | 0 | - | 4.82 | 94,488 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,525 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,590 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,383 |
| The Vietnam War | 0 | - | 4.44 | 35,617 |
| Battle to Country | 0 | - | 4.91 | 53,731 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,023 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,717,525 |
| The American Civil War | 0 | - | 4.62 | 52,572 |
| Random U.S. States on a Map | 0 | - | 4.96 | 629,000 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,489 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,900 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,413 |
| California A-Z | 0 | - | 4.49 | 28,822 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 125,658 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,278 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,124 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,740 |
| Countries in World War I | 0 | - | 4.88 | 228,766 |
| Australia A-Z | 0 | - | 4.54 | 50,089 |
| United States Map Quiz | 0 | - | 4.98 | 4,167,146 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,351 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,129 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,849 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 24,023 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,054 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,876 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,532 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,036 |
| Germany A-Z | 0 | - | 4.56 | 62,784 |
| Italy A-Z | 0 | - | 4.49 | 58,605 |
| British History A-Z #1 | 0 | - | 4.45 | 46,855 |
| China A-Z | 0 | - | 4.55 | 67,498 |
| India A-Z | 0 | - | 4.42 | 34,237 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,912 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,252 |
| U.S. President Scramble | 0 | - | 4.40 | 117,324 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,297 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,021 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 45,171 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,039 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,022 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,062 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,155 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,591 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,747 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,310 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 240,558 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,117 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,780 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,227 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 245,669 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,087 |
| U.S. Senators by State | 0 | - | 4.44 | 40,056 |
| History of Florida | 0 | - | 4.45 | 9,862 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,729 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,573 |
| History of Texas | 0 | - | 4.43 | 14,673 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,158 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,308 |
| US States Quiz | 0 | - | 5.00 | 16,956,589 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,177 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 193,568 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 127,512 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,572 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,189 |
| Monarchies of Europe | 0 | - | 4.90 | 98,586 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,984 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 168,317 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,033 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,536 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,444 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,580 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,350 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,549 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,538 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,398 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,613 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,420 |
| Monarchies of Asia | 0 | - | 4.97 | 71,367 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,691 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,396 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,156 |
| Japan A-Z | 0 | - | 4.40 | 42,331 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,306 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,024 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,885 |
| Countries in World War II | 0 | - | 4.54 | 916,839 |
| Largest City on Every Continent A-Z | 0 | - | 4.97 | 38,428 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.93 | 84,849 |
| U.S. Cities A-Z by Clue #1 | 0 | - | 4.36 | 39,894 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,319 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 334,319 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,659 |
| Pixelated United States Map | 0 | - | 4.88 | 94,633 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,232 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,215 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,942 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,792 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,277 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,601 |
| Presidential Actors | 0 | - | 4.36 | 19,225 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,353 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,466 |
| History of California | 0 | - | 4.40 | 18,783 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,251 |
| History of Illinois | 0 | - | 4.24 | 11,247 |
| History of Maryland | 0 | - | 4.06 | 6,717 |
| History of Massachusetts | 0 | - | 4.14 | 8,416 |
| History of Michigan | 0 | - | 4.26 | 6,971 |
| New York City A-Z | 0 | - | 4.18 | 32,355 |
| History of New York | 0 | - | 4.36 | 16,399 |
| History of New Jersey | 0 | - | 4.38 | 7,299 |
| History of Ohio | 0 | - | 4.14 | 7,370 |
| History of Tennessee | 0 | - | 4.29 | 7,680 |
| History of Washington State | 0 | - | 4.27 | 6,896 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,314 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,670 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,750 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 508,946 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,958 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,974 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,619 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,980 |
| U.S. States By Population | 0 | - | 4.92 | 153,929 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,961 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,735 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.52 | 66,668 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,701 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,075 |
| US States with an Empty Map | 0 | - | 5.00 | 627,288 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,926 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,691 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,433 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,939 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,629 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,716 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,485 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,062 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,551 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,745 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,544 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,931 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,395 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,944 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,253 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,894 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,876 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,787 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,729 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,273 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,099 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,853 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,742 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,204 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,396 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,906 |
| Name the English Monarchs | 0 | - | 4.91 | 505,162 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,984 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,644 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,348 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,933 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,717 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,743 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,554 |
| Hindu Countries | 0 | - | 4.87 | 50,431 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,631 |
| Important Cities in WWII | 0 | - | 4.42 | 93,739 |
| WWII First Names | 0 | - | 4.44 | 41,917 |
| Countries that Have Won the Most Battles | 0 | - | 4.01 | 39,711 |
| Name a World Capital A-Z | 0 | - | 5.00 | 176,738 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,327 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,477 |
| Top U.S. Universities | 0 | - | 4.15 | 145,596 |
| Rivers of the United States | 0 | - | 4.93 | 66,516 |
| Names of Generations | 0 | - | 4.09 | 45,362 |
| U.S. States by Governor | 0 | - | 4.43 | 18,102 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,734 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,430 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,744 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,148 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,016 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,384 |
| Presidential Middle Names | 0 | - | 4.41 | 60,580 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,553 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,784 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,136 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,561 |
| American Founding Fathers | 0 | - | 4.42 | 23,256 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,874 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 47,111 |
