| U.S. Presidents Quiz | 0 | - | 5.00 | 3,673,708 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,677 |
| The American Revolution | 0 | - | 4.52 | 54,147 |
| The Iraq War | 0 | - | 4.47 | 15,596 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,515 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,235 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,255 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,925 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,322 |
| Presidential Middle Names | 0 | - | 4.41 | 59,924 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,979 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,202 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,856 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,280 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,775 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,225 |
| Mississippi River States Empty Map Quiz | 0 | - | 4.81 | 55,761 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,472 |
| The Persian Gulf War | 0 | - | 4.02 | 8,425 |
| Vietnam War Countries | 0 | - | 4.83 | 93,890 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,129 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,676 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,144 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 504,034 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,706 |
| The Vietnam War | 0 | - | 4.43 | 35,408 |
| United States Map Quiz | 0 | - | 4.98 | 4,148,366 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,975 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,710 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,968 |
| U.S. Vice Presidents | 0 | - | 4.39 | 135,629 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,198 |
| First Ladies of the United States | 0 | - | 4.28 | 85,373 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,871 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,160 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,366 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 76,669 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,083 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 23,884 |
| Harvard University | 0 | - | 4.15 | 8,280 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,152 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,733 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,925 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,539 |
| Rust Belt Cities Map Quiz | 0 | - | 4.57 | 34,965 |
| Play-Doh Presidents | 0 | - | 5.00 | 81,935 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.49 | 28,698 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,777 |
| California A-Z | 0 | - | 4.49 | 28,745 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,554 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,527,145 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,323,419 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,315 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,657 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,879 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,204 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,453 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,462 |
| Lord of the Rings Decoder | 0 | - | 4.59 | 42,368 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,045 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,309 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,167 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,761 |
| Name a Valid African Country | 0 | - | 4.98 | 153,412 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,201 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,387 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,569 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,816 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,041 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,163 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,750 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,244 |
| Cities by Wikipedia Descriptions #2 | 0 | - | 4.53 | 38,966 |
| U.S. Cities by Wikipedia Descriptions | 0 | - | 4.48 | 34,112 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,848 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,680 |
| U.S. Senators by State | 0 | - | 4.45 | 39,845 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,546 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,690 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,568 |
| The John Adams Presidency | 0 | - | 4.12 | 8,706 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,712 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,809 |
| History of Florida | 0 | - | 4.45 | 9,791 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,455 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 65,901 |
| History of Texas | 0 | - | 4.43 | 14,579 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,689 |
| American History Quotes #1 | 0 | - | 4.37 | 95,822 |
| American History Quotes #2 | 0 | - | 4.38 | 41,301 |
| US States Quiz | 0 | - | 5.00 | 16,778,380 |
| U.S. States by First Two Letters in 30 Seconds | 0 | - | 4.69 | 1,385,349 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,120 |
| Books by U.S. State | 0 | - | 4.20 | 13,970 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,064 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,522 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,854 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,953 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,486 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,682 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,894 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 56,368 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,419 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,851 |
| Lord of the Rings Characters | 0 | - | 4.54 | 112,849 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,607 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,768 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,698 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 119,424 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,477 |
| Political Movements by Country | 0 | - | 4.46 | 72,390 |
| Brand Logos Quiz #1 | 0 | - | 4.82 | 2,411,139 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,965 |
| Hindu Countries | 0 | - | 4.86 | 49,818 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,517 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,226 |
| Countries that Beat Australia | 0 | - | 4.92 | 92,395 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,943 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,774 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,651 |
| Pixelated United States Map | 0 | - | 4.89 | 93,813 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,002 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,243 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,817 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,502 |
| Arms Exports - United States | 0 | - | 4.75 | 61,922 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,431 |
| The George Washington Presidency | 0 | - | 4.03 | 14,505 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,903 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,265 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,638 |
| History of California | 0 | - | 4.40 | 18,716 |
| 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 | 16,312 |
| Las Vegas Casinos | 0 | - | 4.12 | 38,016 |
| History of New Jersey | 0 | - | 4.38 | 7,229 |
| History of Ohio | 0 | - | 4.14 | 7,322 |
| History of Tennessee | 0 | - | 4.29 | 7,644 |
| History of Washington State | 0 | - | 4.27 | 6,852 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,729 |
| The American Civil War | 0 | - | 4.62 | 52,281 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,346 |
| U.S. States by Clue #1 | 0 | - | 4.51 | 38,815 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,917 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,912 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,351 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,583 |
| U.S. States By Population | 0 | - | 4.92 | 152,784 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,884 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,160 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,334 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,630 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,082 |
| US States with an Empty Map | 0 | - | 5.00 | 621,345 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,200 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,707 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,952 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,851 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,975 |
| Draw All US State Borders | 0 | - | 4.99 | 135,304 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,254 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,384 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,545 |
| U.S. State Birds | 0 | - | 4.31 | 21,371 |
| Tourist Attractions by U.S. State | 0 | - | 4.46 | 62,510 |
| Colleges by U.S. State - Multiple Choice | 0 | - | 4.57 | 22,979 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,528 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,372 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,859 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,325 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,980 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,189 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,407 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,200 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,196 |
| Merged U.S. States | 0 | - | 4.37 | 43,986 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,116 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,322 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,782 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,410 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,504 |
| Random Point on Land to European Country | 0 | - | 4.93 | 76,507 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,864 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,245 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,632 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,178 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 46,870 |
| Countries that Beat Germany | 0 | - | 4.95 | 105,813 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 34,747 |
| Least Irish U.S. States | 0 | - | 4.49 | 18,259 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,123 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 60,675 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,948 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,083 |
| Countries that Beat Spain | 0 | - | 4.94 | 62,658 |
| Countries of Iberia in History with a Map | 0 | - | 4.87 | 41,341 |
