| U.S. Presidents Quiz | 0 | - | 5.00 | 3,652,735 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,217 |
| The Iraq War | 0 | - | 4.47 | 15,548 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,774 |
| The American Revolution | 0 | - | 4.52 | 54,049 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,675 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,183 |
| The Persian Gulf War | 0 | - | 4.02 | 8,399 |
| Vietnam War Countries | 0 | - | 4.83 | 93,584 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 227,365 |
| Countries in World War I | 0 | - | 4.88 | 226,560 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,430 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,544 |
| The Vietnam War | 0 | - | 4.43 | 35,287 |
| Battle to Country | 0 | - | 4.91 | 52,497 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,507 |
| The American Civil War | 0 | - | 4.62 | 52,148 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,309 |
| WWII First Names | 0 | - | 4.44 | 41,555 |
| U.S. Vice Presidents | 0 | - | 4.41 | 134,884 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 107,921 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,448 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 92,984 |
| Presidential Middle Names | 0 | - | 4.41 | 59,687 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,714 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,798 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,730 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,161 |
| Mississippi River States Empty Map Quiz | 0 | - | 4.81 | 55,594 |
| Countries in World War II | 0 | - | 4.53 | 904,200 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,382 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,840 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,628 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,534 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,220 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,301 |
| Countries Closest to United States A-Z | 0 | - | 4.81 | 117,387 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,878 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,669 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,583 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,162 |
| First Ladies of the United States | 0 | - | 4.28 | 85,230 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,812 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,109 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,498 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,261 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 15,998 |
| Add a Letter - Make a U.S. President | 0 | - | 4.61 | 23,827 |
| Harvard University | 0 | - | 4.15 | 8,260 |
| Las Vegas Casinos | 0 | - | 4.12 | 37,969 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,000 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,681 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 72,420 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.90 | 105,292 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,809 |
| Important Cities in WWII | 0 | - | 4.42 | 92,866 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,370 |
| Rust Belt Cities Map Quiz | 0 | - | 4.57 | 34,880 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,655 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,689 |
| California A-Z | 0 | - | 4.49 | 28,703 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,725 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,666 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,304 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 124,681 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 103,847 |
| Communist Countries in History | 0 | - | 4.63 | 492,398 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,835 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,343 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,068 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,058 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,934 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,805 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,286 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,622 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,846 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,116 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,799 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,732 |
| U.S. Senators by State | 0 | - | 4.45 | 39,743 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,457 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,658 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,491 |
| The John Adams Presidency | 0 | - | 4.12 | 8,675 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,681 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,770 |
| History of Florida | 0 | - | 4.45 | 9,761 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,040 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,605 |
| History of Texas | 0 | - | 4.43 | 14,551 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,470 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,074 |
| US States Quiz | 0 | - | 5.00 | 16,694,268 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,211 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,215 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,090 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,190 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,199 |
| Monarchies of Europe | 0 | - | 4.90 | 97,284 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,435 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,102 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,893 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,384 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,344 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,068 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 55,983 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,932 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,741 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,211 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,482 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,208 |
| Monarchies of Asia | 0 | - | 4.97 | 70,586 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,680 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,524 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,421 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,646 |
| Hindu Countries | 0 | - | 4.85 | 49,544 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,155 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,079 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,792 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,847 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 38,910 |
| Pixelated United States Map | 0 | - | 4.89 | 93,443 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,425 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,819 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,376 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,336 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,517 |
| Red State or Blue State Trait? | 0 | - | 4.42 | 54,924 |
| The George Washington Presidency | 0 | - | 4.03 | 14,473 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,867 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,206 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,608 |
| History of California | 0 | - | 4.40 | 18,693 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,178 |
| History of Illinois | 0 | - | 4.24 | 11,175 |
| History of Maryland | 0 | - | 4.06 | 6,648 |
| History of Massachusetts | 0 | - | 4.14 | 8,327 |
| History of Michigan | 0 | - | 4.26 | 6,902 |
| History of New York | 0 | - | 4.36 | 16,279 |
| History of New Jersey | 0 | - | 4.38 | 7,204 |
| History of Ohio | 0 | - | 4.14 | 7,307 |
| History of Tennessee | 0 | - | 4.29 | 7,632 |
| History of Washington State | 0 | - | 4.27 | 6,837 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,463 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,495 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,692 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,651 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,325 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,373 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,617 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,870 |
| U.S. States By Population | 0 | - | 4.92 | 152,329 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,364 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,837 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,175 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 51,367 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,542 |
| US States with an Empty Map | 0 | - | 5.00 | 618,607 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,880 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,527 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,747 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,861 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,263 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,468 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,849 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,065 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,459 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,057 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,648 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,410 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,074 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,391 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,070 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,921 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,810 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,561 |
| Merged U.S. States | 0 | - | 4.36 | 43,850 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,665 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,112 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,091 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,887 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,937 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,444 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,502 |
| Least Irish U.S. States | 0 | - | 4.49 | 18,215 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.87 | 60,341 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,118 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 85,465 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,817 |
| Name the English Monarchs | 0 | - | 4.92 | 497,754 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,190 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,186 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,252 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,702 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,401 |
| The Dictator Files: Adolf Hitler | 0 | - | 4.79 | 77,298 |
| Cities Bombed During WWII | 0 | - | 4.08 | 29,898 |
| Countries by Percent WWII Deaths | 0 | - | 4.09 | 29,728 |
| Countries that Have Won the Most Battles | 0 | - | 4.02 | 39,356 |
