| U.S. Presidents Quiz | 0 | - | 5.00 | 3,709,339 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,648 |
| The American Revolution | 0 | - | 4.52 | 54,295 |
| The Iraq War | 0 | - | 4.47 | 15,674 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,416 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,652 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,948 |
| U.S. Presidents by Event | 0 | - | 4.58 | 34,740 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 94,025 |
| Presidential Middle Names | 0 | - | 4.41 | 60,423 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 53,460 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 94,675 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 35,057 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,491 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,207 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,302 |
| Mississippi River States Empty Map Quiz | 0 | - | 4.82 | 56,070 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,396 |
| The Persian Gulf War | 0 | - | 4.02 | 8,463 |
| Vietnam War Countries | 0 | - | 4.82 | 94,369 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,852 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,229 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,277 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 507,956 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 209,509 |
| The Vietnam War | 0 | - | 4.44 | 35,581 |
| United States Map Quiz | 0 | - | 4.98 | 4,163,877 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,108 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,831 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,111 |
| U.S. Vice Presidents | 0 | - | 4.39 | 136,519 |
| U.S. Governors Who Ran For President | 0 | - | 4.47 | 20,281 |
| First Ladies of the United States | 0 | - | 4.28 | 85,751 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,983 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 26,251 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,364 |
| U.S. Presidents in Order by First Letter | 0 | - | 4.32 | 77,282 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.64 | 16,238 |
| Add a Letter - Make a U.S. President | 0 | - | 4.57 | 24,003 |
| Harvard University | 0 | - | 4.15 | 8,306 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,455 |
| Shortest U.S. Presidential Terms | 0 | - | 4.75 | 12,858 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,801 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,812 |
| Rust Belt Cities Map Quiz | 0 | - | 4.57 | 35,172 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,491 |
| U.S. Presidents by Picture - Multiple Choice | 0 | - | 4.50 | 28,900 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,952 |
| California A-Z | 0 | - | 4.49 | 28,807 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,647 |
| Fifty US States in One Minute | 0 | - | 4.61 | 3,545,433 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,926 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,330,997 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,682 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,757 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,886 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,822 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,868 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,727 |
| Lord of the Rings Decoder | 0 | - | 4.61 | 42,700 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,379 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,624 |
| U.S. State Nicknames | 0 | - | 4.47 | 50,601 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,128 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,768 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,893 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,626 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,889 |
| Names of Generations | 0 | - | 4.09 | 45,218 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,915 |
| Cities by Wikipedia Descriptions #2 | 0 | - | 4.53 | 39,078 |
| U.S. Cities by Wikipedia Descriptions | 0 | - | 4.48 | 34,226 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,040 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,944 |
| U.S. Senators by State | 0 | - | 4.44 | 40,006 |
| U.S. Presidential Running Mates | 0 | - | 4.40 | 28,679 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 13,751 |
| Random U.S. Vice President to President | 0 | - | 4.39 | 30,673 |
| The John Adams Presidency | 0 | - | 4.12 | 8,762 |
| The Theodore Roosevelt Presidency | 0 | - | 4.39 | 7,749 |
| U.S. Vice Presidential Trivia | 0 | - | 4.26 | 12,871 |
| History of Florida | 0 | - | 4.45 | 9,844 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,425 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,415 |
| History of Texas | 0 | - | 4.43 | 14,654 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,040 |
| American History Quotes #1 | 0 | - | 4.37 | 96,104 |
| American History Quotes #2 | 0 | - | 4.38 | 41,445 |
| US States Quiz | 0 | - | 5.00 | 16,921,884 |
| U.S. States by First Two Letters in 30 Seconds | 0 | - | 4.70 | 1,394,062 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,847 |
| Books by U.S. State | 0 | - | 4.20 | 14,008 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,840 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,775 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,554 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,129 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,347 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 262,280 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 115,078 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 57,162 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,287 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,025 |
| Lord of the Rings Characters | 0 | - | 4.54 | 113,444 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,843 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,578 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,495 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,598 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,256 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,115 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,779 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,828 |
| Name a Valid African Country | 0 | - | 4.98 | 154,396 |
| Political Movements by Country | 0 | - | 4.46 | 72,626 |
| Brand Logos Quiz #1 | 0 | - | 4.83 | 2,429,105 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,716 |
| Countries that Beat Australia | 0 | - | 4.92 | 93,032 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,247 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,238 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,167 |
| Pixelated United States Map | 0 | - | 4.88 | 94,489 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,965 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 92,010 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,715 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,736 |
| Arms Exports - United States | 0 | - | 4.77 | 62,538 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,557 |
| The George Washington Presidency | 0 | - | 4.03 | 14,569 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.35 | 16,949 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,335 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.36 | 21,708 |
| 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 | 11,235 |
| History of Maryland | 0 | - | 4.06 | 6,704 |
| History of Massachusetts | 0 | - | 4.14 | 8,405 |
| History of Michigan | 0 | - | 4.26 | 6,961 |
| History of New York | 0 | - | 4.36 | 16,379 |
| Las Vegas Casinos | 0 | - | 4.13 | 38,091 |
| History of New Jersey | 0 | - | 4.38 | 7,282 |
| 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 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,206 |
| The American Civil War | 0 | - | 4.62 | 52,505 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,141 |
| U.S. States by Clue #1 | 0 | - | 4.51 | 39,220 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,737 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,687 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,362 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,678 |
| U.S. States By Population | 0 | - | 4.92 | 153,757 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,739 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,607 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.52 | 66,600 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,555 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,859 |
| US States with an Empty Map | 0 | - | 5.00 | 626,116 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,716 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 77,159 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,521 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 49,113 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,338 |
| Draw All US State Borders | 0 | - | 4.99 | 138,705 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,804 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,584 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,676 |
| U.S. State Birds | 0 | - | 4.31 | 21,426 |
| Tourist Attractions by U.S. State | 0 | - | 4.46 | 62,641 |
| Colleges by U.S. State - Multiple Choice | 0 | - | 4.57 | 23,079 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,301 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,962 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,429 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,676 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,457 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,355 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,958 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,618 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,734 |
| Merged U.S. States | 0 | - | 4.37 | 44,261 |
| Countries that Beat Canada | 0 | - | 4.91 | 98,531 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,403 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,038 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,965 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,537 |
| Random Point on Land to European Country | 0 | - | 4.94 | 77,461 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,671 |
| Countries that Beat Russia | 0 | - | 4.81 | 83,080 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,864 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,124 |
| Country Quiz on a Map - France | 0 | - | 4.98 | 47,373 |
| Countries that Beat Germany | 0 | - | 4.94 | 106,760 |
| Country Quiz on a Map - Germany | 0 | - | 4.95 | 35,214 |
| Least Irish U.S. States | 0 | - | 4.49 | 18,338 |
| Countries that Beat Italy | 0 | - | 4.85 | 54,664 |
| Modern Day Countries of the Dutch Empire on a Map | 0 | - | 4.86 | 61,320 |
| Countries that Beat Portugal | 0 | - | 4.86 | 59,529 |
| Geography of the Spanish Empire | 0 | - | 4.49 | 37,226 |
| Countries that Beat Spain | 0 | - | 4.94 | 63,082 |
| Countries of Iberia in History with a Map | 0 | - | 4.88 | 42,074 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.95 | 86,537 |
