| The American Revolution | 0 | - | 4.52 | 54,296 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,417 |
| The Iraq War | 0 | - | 4.47 | 15,674 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,156 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,812 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,675 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,500 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,763 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,897 |
| The Persian Gulf War | 0 | - | 4.02 | 8,463 |
| Vietnam War Countries | 0 | - | 4.82 | 94,376 |
| The Vietnam War | 0 | - | 4.44 | 35,584 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,906 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,709,798 |
| Random U.S. States on a Map | 0 | - | 4.96 | 627,965 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,380 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,288 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,411 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,864 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,518 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,234 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,280 |
| United States Map Quiz | 0 | - | 4.98 | 4,164,028 |
| Arms Exports - United States | 0 | - | 4.77 | 62,541 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,109 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,832 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,984 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,397 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,805 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,459 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,208 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,498 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,668 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,814 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,214 |
| U.S. President Scramble | 0 | - | 4.40 | 117,133 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,231 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,955 |
| California A-Z | 0 | - | 4.49 | 28,808 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,509 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,647 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,928 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,331,083 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,692 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,830 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,872 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 121,302 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,627 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,607 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,136 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,780 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,900 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,630 |
| Names of Generations | 0 | - | 4.09 | 45,227 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,955 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 69,264 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,041 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,952 |
| U.S. Senators by State | 0 | - | 4.44 | 40,008 |
| History of Florida | 0 | - | 4.45 | 9,844 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,433 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,423 |
| History of Texas | 0 | - | 4.43 | 14,656 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,048 |
| American History Quotes #1 | 0 | - | 4.37 | 96,110 |
| American History Quotes #2 | 0 | - | 4.38 | 41,447 |
| US States Quiz | 0 | - | 5.00 | 16,923,390 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,861 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,853 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 234,009 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 277,437 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 167,710 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,789 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,603 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,141 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,356 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,410 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,086 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,170 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,433 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,295 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,040 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,845 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,595 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,517 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,637 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,377 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,121 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,262 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,121 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,405 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,787 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,835 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 92,630 |
| Name a Valid African Country | 0 | - | 4.98 | 154,403 |
| Political Movements by Country | 0 | - | 4.46 | 72,630 |
| Brand Logos Quiz #1 | 0 | - | 4.83 | 2,429,271 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,722 |
| U.S. Cities A-Z by Clue #1 | 0 | - | 4.36 | 39,868 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,248 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,307 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,208 |
| Pixelated United States Map | 0 | - | 4.88 | 94,494 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,974 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,020 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,726 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,738 |
| 75 Americans Named John | 0 | - | 4.41 | 23,929 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,558 |
| Presidential Actors | 0 | - | 4.36 | 19,201 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,336 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,426 |
| History of California | 0 | - | 4.40 | 18,769 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,241 |
| History of Illinois | 0 | - | 4.24 | 11,237 |
| History of Maryland | 0 | - | 4.06 | 6,704 |
| History of Massachusetts | 0 | - | 4.14 | 8,405 |
| History of Michigan | 0 | - | 4.26 | 6,962 |
| History of New York | 0 | - | 4.36 | 16,380 |
| History of New Jersey | 0 | - | 4.38 | 7,284 |
| History of Ohio | 0 | - | 4.14 | 7,361 |
| History of Tennessee | 0 | - | 4.29 | 7,675 |
| History of Washington State | 0 | - | 4.27 | 6,889 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,558 |
| The American Civil War | 0 | - | 4.62 | 52,506 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,147 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 507,995 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,748 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,693 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,371 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,686 |
| U.S. States By Population | 0 | - | 4.92 | 153,765 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,754 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,612 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.52 | 66,603 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,559 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,865 |
| US States with an Empty Map | 0 | - | 5.00 | 626,173 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,719 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,338 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,536 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,340 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,813 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,586 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,678 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,310 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,965 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,431 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,678 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,459 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,356 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,965 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,624 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,740 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,542 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,419 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,052 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,970 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,548 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,676 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,090 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,871 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,130 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,384 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,217 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,535 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,538 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,760 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,735 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,625 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,220 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,129 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,809 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,120 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,585 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,533 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,438 |
| Hindu Countries | 0 | - | 4.86 | 50,321 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,455 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,273 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,411 |
| Rivers of the United States | 0 | - | 4.93 | 66,370 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 118,368 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,962 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,752 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,038 |
| Presidential Middle Names | 0 | - | 4.41 | 60,438 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,473 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,680 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,065 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,496 |
| American Founding Fathers | 0 | - | 4.42 | 23,243 |
| Countries Closest to Alaska | 0 | - | 4.93 | 124,612 |
| California Groups of Things | 0 | - | 4.25 | 45,531 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 47,016 |
| Hawaiian Islands | 0 | - | 4.83 | 42,784 |
| Countries Closest to Maine | 0 | - | 4.85 | 67,261 |
| Harvard University | 0 | - | 4.15 | 8,306 |
| New York Groups of Things | 0 | - | 4.35 | 63,965 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,389 |
