| The American Revolution | 0 | - | 4.52 | 54,149 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,925 |
| The Iraq War | 0 | - | 4.47 | 15,598 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,018 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,940 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,698 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,942 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,672 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,894 |
| The Persian Gulf War | 0 | - | 4.02 | 8,426 |
| Vietnam War Countries | 0 | - | 4.83 | 93,899 |
| The Vietnam War | 0 | - | 4.43 | 35,410 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,764 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,674,285 |
| Random U.S. States on a Map | 0 | - | 4.96 | 623,663 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,049 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,793 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,485 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,141 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,185 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,682 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,146 |
| United States Map Quiz | 0 | - | 4.98 | 4,148,581 |
| Arms Exports - United States | 0 | - | 4.75 | 61,951 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,978 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,716 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,875 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,395 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,583 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,155 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,733 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,537 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,258 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,547 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,130 |
| U.S. President Scramble | 0 | - | 4.40 | 116,474 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,087 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,779 |
| California A-Z | 0 | - | 4.49 | 28,746 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,338 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,555 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,518 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,355 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,210 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,457 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,318 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,205 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,179 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,774 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,783 |
| Name a Valid African Country | 0 | - | 4.98 | 153,430 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,730 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,212 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,390 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,580 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,832 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,061 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,169 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,294 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,927 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,852 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,683 |
| U.S. Senators by State | 0 | - | 4.45 | 39,848 |
| History of Florida | 0 | - | 4.45 | 9,791 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,470 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,907 |
| History of Texas | 0 | - | 4.43 | 14,579 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,695 |
| American History Quotes #1 | 0 | - | 4.37 | 95,837 |
| American History Quotes #2 | 0 | - | 4.38 | 41,305 |
| US States Quiz | 0 | - | 5.00 | 16,780,505 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,140 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,089 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,802 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,740 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 166,090 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,545 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 75,869 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,968 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,494 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,743 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,924 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,382 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,152 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,434 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,869 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,609 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,786 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,713 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 119,536 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,330 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,055 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,490 |
| Political Movements by Country | 0 | - | 4.46 | 72,395 |
| Brand Logos Quiz #1 | 0 | - | 4.82 | 2,411,405 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,975 |
| Hindu Countries | 0 | - | 4.86 | 49,828 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,529 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,238 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,944 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,848 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,689 |
| Pixelated United States Map | 0 | - | 4.89 | 93,818 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,022 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,258 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,826 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,506 |
| 75 Americans Named John | 0 | - | 4.41 | 23,862 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,434 |
| Presidential Actors | 0 | - | 4.36 | 19,119 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,266 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,319 |
| History of California | 0 | - | 4.40 | 18,717 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,194 |
| History of Illinois | 0 | - | 4.24 | 11,196 |
| History of Maryland | 0 | - | 4.06 | 6,670 |
| History of Massachusetts | 0 | - | 4.14 | 8,357 |
| History of Michigan | 0 | - | 4.26 | 6,924 |
| History of New York | 0 | - | 4.36 | 16,313 |
| History of New Jersey | 0 | - | 4.38 | 7,230 |
| History of Ohio | 0 | - | 4.14 | 7,322 |
| History of Tennessee | 0 | - | 4.29 | 7,644 |
| History of Washington State | 0 | - | 4.27 | 6,853 |
| Valid Answer - U.S. History | 0 | - | 4.24 | 22,492 |
| The American Civil War | 0 | - | 4.62 | 52,285 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,363 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 504,088 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,932 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,929 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,372 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,596 |
| U.S. States By Population | 0 | - | 4.92 | 152,792 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,902 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,169 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,343 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,646 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,093 |
| US States with an Empty Map | 0 | - | 5.00 | 621,413 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,202 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,134 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,957 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,983 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,263 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,387 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,547 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,548 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,379 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,871 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,334 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,984 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,194 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,420 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,204 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,205 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,123 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,344 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,793 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,420 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,522 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,876 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,253 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,635 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,193 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 46,879 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,760 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,952 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,138 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,878 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,579 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,668 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,512 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,444 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,495 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,947 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,839 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,644 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 27,015 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,135 |
| Rivers of the United States | 0 | - | 4.93 | 65,836 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,793 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,272 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,940 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,333 |
| Presidential Middle Names | 0 | - | 4.41 | 59,935 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,989 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,209 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,858 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,284 |
| American Founding Fathers | 0 | - | 4.42 | 23,113 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,801 |
| California Groups of Things | 0 | - | 4.25 | 45,339 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.24 | 46,685 |
| Hawaiian Islands | 0 | - | 4.83 | 42,564 |
| Countries Closest to Maine | 0 | - | 4.85 | 66,756 |
| Harvard University | 0 | - | 4.15 | 8,280 |
| New York Groups of Things | 0 | - | 4.38 | 60,021 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,212 |
| People on Money - United States | 0 | - | 4.31 | 63,265 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,831 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,050 |
