| Deadliest U.S. Wars | 0 | - | 4.89 | 192,065 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,747 |
| The Iraq War | 0 | - | 4.47 | 15,721 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,964 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,349 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,084 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,984 |
| The American Revolution | 0 | - | 4.52 | 54,395 |
| The Persian Gulf War | 0 | - | 4.02 | 8,491 |
| Vietnam War Countries | 0 | - | 4.82 | 94,779 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,858 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,965 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,230 |
| The Vietnam War | 0 | - | 4.44 | 35,696 |
| Battle to Country | 0 | - | 4.91 | 54,148 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 73,180 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,732,453 |
| The American Civil War | 0 | - | 4.62 | 52,671 |
| Random U.S. States on a Map | 0 | - | 4.96 | 631,426 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,673 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 306,461 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,678 |
| California A-Z | 0 | - | 4.49 | 28,863 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 126,090 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 126,739 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.83 | 62,297 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,825 |
| Countries in World War I | 0 | - | 4.88 | 229,510 |
| Australia A-Z | 0 | - | 4.54 | 50,169 |
| United States Map Quiz | 0 | - | 4.98 | 4,174,093 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,364 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,173 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,881 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,974 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,971 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,683 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,585 |
| Germany A-Z | 0 | - | 4.56 | 62,916 |
| Italy A-Z | 0 | - | 4.49 | 58,882 |
| British History A-Z #1 | 0 | - | 4.45 | 47,358 |
| China A-Z | 0 | - | 4.55 | 67,770 |
| India A-Z | 0 | - | 4.42 | 34,332 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 114,043 |
| U.S. President Scramble | 0 | - | 4.40 | 117,582 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,372 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 48,121 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.11 | 53,454 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,231 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 70,813 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,725 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,774 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 92,984 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,978 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,618 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 241,017 |
| Total United States Immigration by Country | 0 | - | 4.91 | 112,601 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 76,098 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 175,908 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 247,161 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,208 |
| U.S. Senators by State | 0 | - | 4.44 | 40,151 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,299 |
| History of Florida | 0 | - | 4.45 | 9,890 |
| Cities and Towns of Massachusetts | 0 | - | 4.93 | 75,291 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,846 |
| History of Texas | 0 | - | 4.43 | 14,705 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,348 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,376 |
| US States Quiz | 0 | - | 5.00 | 17,029,276 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 368,948 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 194,115 |
| Top 10 Hottest European Countries | 0 | - | 4.88 | 128,015 |
| Catholic Countries in Europe | 0 | - | 4.83 | 95,928 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 201,039 |
| Monarchies of Europe | 0 | - | 4.90 | 99,072 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 236,459 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 169,370 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,614 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,189 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,064 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,062 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,765 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,980 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 117,162 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,097 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,832 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,838 |
| Monarchies of Asia | 0 | - | 4.97 | 71,640 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,615 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,984 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,376 |
| Japan A-Z | 0 | - | 4.40 | 42,454 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,742 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,526 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 93,646 |
| Countries in World War II | 0 | - | 4.55 | 920,625 |
| Largest City on Every Continent A-Z | 0 | - | 4.97 | 38,661 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.92 | 95,760 |
| U.S. Cities A-Z by Clue #1 | 0 | - | 4.36 | 40,000 |
| 10 Longest Rivers in the United States | 0 | - | 4.86 | 39,472 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 336,442 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 53,134 |
| Pixelated United States Map | 0 | - | 4.89 | 95,005 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 110,789 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,642 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 147,441 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,925 |
| Countries that Beat the United States | 0 | - | 4.93 | 168,973 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 55,790 |
| Presidential Actors | 0 | - | 4.36 | 19,266 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.38 | 24,093 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,398 |
| History of California | 0 | - | 4.40 | 18,809 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,273 |
| History of Illinois | 0 | - | 4.24 | 11,264 |
| History of Maryland | 0 | - | 4.06 | 6,744 |
| History of Massachusetts | 0 | - | 4.14 | 8,444 |
| History of Michigan | 0 | - | 4.26 | 6,996 |
| New York City A-Z | 0 | - | 4.18 | 32,413 |
| History of New York | 0 | - | 4.36 | 16,434 |
| History of New Jersey | 0 | - | 4.38 | 7,320 |
| History of Ohio | 0 | - | 4.14 | 7,392 |
| History of Tennessee | 0 | - | 4.29 | 7,697 |
| History of Washington State | 0 | - | 4.27 | 6,923 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,526 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,727 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 119,231 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 511,155 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 112,473 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 114,488 |
| U.S. States with Short Names | 0 | - | 4.91 | 150,568 |
| U.S. States that Start with M | 0 | - | 4.94 | 188,620 |
| U.S. States By Population | 0 | - | 4.92 | 154,282 |
| U.S. States that Start with N | 0 | - | 4.95 | 172,413 |
| U.S. States with Longest Names | 0 | - | 4.85 | 45,008 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.52 | 66,773 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,940 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 49,481 |
| US States with an Empty Map | 0 | - | 5.00 | 629,770 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 83,193 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 89,003 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,617 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 66,235 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,725 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,791 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 161,203 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 178,336 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,791 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,886 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,739 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.54 | 65,070 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,496 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.74 | 64,111 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 102,603 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 83,130 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 68,083 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,854 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 97,452 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,461 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,443 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 134,663 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,318 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 166,674 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 105,039 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 99,224 |
| Name the English Monarchs | 0 | - | 4.91 | 507,560 |
| Commonwealth of Nations Countries | 0 | - | 4.95 | 238,655 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,658 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,676 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 73,133 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,963 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 90,145 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,854 |
| Hindu Countries | 0 | - | 4.86 | 50,698 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,171 |
| Important Cities in WWII | 0 | - | 4.42 | 94,302 |
| WWII First Names | 0 | - | 4.45 | 42,025 |
| Countries that Have Won the Most Battles | 0 | - | 4.01 | 39,825 |
| Name a World Capital A-Z | 0 | - | 5.00 | 177,380 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,489 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,612 |
| Top U.S. Universities | 0 | - | 4.15 | 146,037 |
| Rivers of the United States | 0 | - | 4.93 | 66,819 |
| Names of Generations | 0 | - | 4.09 | 45,618 |
| U.S. States by Governor | 0 | - | 4.43 | 18,125 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,790 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,508 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,813 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 109,692 |
| U.S. Presidents by Event | 0 | - | 4.58 | 35,494 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.62 | 94,788 |
| Presidential Middle Names | 0 | - | 4.42 | 60,821 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,758 |
| Assassinated U.S. Presidents | 0 | - | 4.62 | 94,948 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,262 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,666 |
| The Barack Obama Presidency | 0 | - | 4.14 | 25,534 |
| American Founding Fathers | 0 | - | 4.42 | 23,306 |
| Countries Closest to Alaska | 0 | - | 4.93 | 125,354 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 47,267 |
