| U.S. Presidents by Picture | 0 | - | 4.87 | 424,119 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,810 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,408 |
| Countries Closest to United States A-Z | 0 | - | 4.82 | 117,511 |
| Random U.S. States on a Map | 0 | - | 4.96 | 622,190 |
| Name Every Beatles Song | 0 | - | 4.97 | 234,352 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,564 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,660,168 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,743 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,542 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.96 | 192,682 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 233,336 |
| U.S. Map with Random Merged States | 0 | - | 4.94 | 300,243 |
| The Vietnam War | 0 | - | 4.43 | 35,324 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,895 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,674 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,506 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,046 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,990 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,799 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,600 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,752 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,037 |
| United States Map Quiz | 0 | - | 4.98 | 4,143,725 |
| U.S. President Scramble | 0 | - | 4.40 | 116,271 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,105 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,039 |
| The American Civil War | 0 | - | 4.62 | 52,186 |
| Imagine Lyrics | 0 | - | 4.53 | 43,082 |
| The Iraq War | 0 | - | 4.47 | 15,565 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,024 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,470 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,418 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,955 |
| U.S. Presidential Quotes | 0 | - | 4.37 | 44,371 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,091 |
| The Jimmy Carter Presidency | 0 | - | 4.41 | 19,039 |
| People in Pictures with Ronald Reagan | 0 | - | 4.35 | 40,488 |
| The American Revolution | 0 | - | 4.52 | 54,078 |
| History of Florida | 0 | - | 4.45 | 9,771 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,155 |
| History of Texas | 0 | - | 4.43 | 14,561 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,556 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,757 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,095 |
| US States Quiz | 0 | - | 5.00 | 16,723,039 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,478 |
| Catholic Countries in Europe | 0 | - | 4.83 | 94,317 |
| Monarchies of Europe | 0 | - | 4.90 | 97,425 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,785 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,090 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,546 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,223 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 26,982 |
| Beatles Songs by Synonyms | 0 | - | 4.74 | 40,344 |
| Monarchies of Asia | 0 | - | 4.97 | 70,659 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,479 |
| Battle to Country | 0 | - | 4.91 | 52,608 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,026 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,759 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,227 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,442 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,202 |
| Australia A-Z | 0 | - | 4.54 | 49,809 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,160 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.93 | 91,162 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,255 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,307 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,760 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,341 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 241,274 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,594 |
| Pixelated United States Map | 0 | - | 4.89 | 93,587 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,623 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,954 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,771 |
| Presidential Actors | 0 | - | 4.36 | 19,075 |
| The Bill Clinton Presidency | 0 | - | 4.22 | 31,365 |
| The George H. W. Bush Presidency | 0 | - | 4.36 | 21,426 |
| The Ronald Reagan Presidency | 0 | - | 4.26 | 24,729 |
| The Richard Nixon Presidency | 0 | - | 4.05 | 21,930 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,269 |
| American Revolution Decoder | 0 | - | 4.10 | 20,886 |
| California A-Z | 0 | - | 4.49 | 28,722 |
| Chicago A-Z | 0 | - | 4.25 | 15,460 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,709 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,558 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,195 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,868 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,488 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,533 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,823 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,078 |
| U.S. States By Population | 0 | - | 4.92 | 152,478 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,528 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,947 |
| US States with an Empty Map | 0 | - | 5.00 | 619,546 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,953 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,650 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,804 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,967 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,995 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,139 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,565 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,110 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,717 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,898 |
| Top 10 Coldest European Countries | 0 | - | 4.94 | 192,338 |
| Top 10 Hottest European Countries | 0 | - | 4.89 | 126,205 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,255 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,444 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,183 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 230,827 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,387 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,090 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,090 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,490 |
| First Lines of Beatles Songs | 0 | - | 4.36 | 46,625 |
| Beatles Songs by Synopsis | 0 | - | 4.31 | 32,714 |
| Name the English Monarchs | 0 | - | 4.92 | 498,587 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,535 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,327 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 108,852 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,677 |
| The Persian Gulf War | 0 | - | 4.02 | 8,412 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,330 |
| Name a World Capital A-Z | 0 | - | 5.00 | 175,118 |
| India A-Z | 0 | - | 4.42 | 33,945 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,435 |
| Hindu Countries | 0 | - | 4.86 | 49,644 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 26,903 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,007 |
| Top U.S. Universities | 0 | - | 4.15 | 144,215 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,843 |
| Rivers of the United States | 0 | - | 4.93 | 65,601 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 40,739 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,542 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,395 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,718 |
| U.S. States by Governor | 0 | - | 4.43 | 17,992 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,589 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,196 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,562 |
| U.S. Vice Presidents | 0 | - | 4.41 | 135,169 |
| U.S. Presidential Trivia #1 | 0 | - | 4.45 | 108,049 |
| U.S. Presidents by Event | 0 | - | 4.58 | 33,630 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.61 | 93,092 |
| Presidential Middle Names | 0 | - | 4.41 | 59,767 |
| U.S. Presidential Trivia #2 | 0 | - | 4.49 | 52,815 |
| Assassinated U.S. Presidents | 0 | - | 4.63 | 93,904 |
| U.S. Presidents Who Died in Office | 0 | - | 4.77 | 34,770 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 38,198 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,504 |
| American Founding Fathers | 0 | - | 4.41 | 23,084 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,427 |
| History of California | 0 | - | 4.40 | 18,704 |
| Stephen Curry Quiz | 0 | - | 4.36 | 66,432 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,183 |
| Hawaiian Islands | 0 | - | 4.83 | 42,470 |
| History of Illinois | 0 | - | 4.24 | 11,181 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,518 |
| History of Maryland | 0 | - | 4.06 | 6,652 |
| History of Massachusetts | 0 | - | 4.14 | 8,338 |
| Harvard University | 0 | - | 4.15 | 8,269 |
| History of Michigan | 0 | - | 4.26 | 6,907 |
| History of New York | 0 | - | 4.36 | 16,290 |
| History of New Jersey | 0 | - | 4.38 | 7,213 |
| History of Ohio | 0 | - | 4.14 | 7,310 |
| LeBron James Trivia | 0 | - | 4.01 | 170,026 |
| History of Tennessee | 0 | - | 4.29 | 7,637 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,113 |
| History of Washington State | 0 | - | 4.27 | 6,843 |
| American History Quotes #1 | 0 | - | 4.37 | 95,722 |
| People on Money - United States | 0 | - | 4.31 | 63,224 |
| American History Quotes #2 | 0 | - | 4.38 | 41,241 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,272 |
| Embarrassing Chapters in US History | 0 | - | 4.17 | 33,012 |
| U.S. History Multiple Choice #3 | 0 | - | 4.43 | 24,654 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,513 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 502,479 |
| U.S. State Flags | 0 | - | 4.89 | 167,695 |
| U.S. States that Border Canada | 0 | - | 4.91 | 182,772 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,226 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 52,924 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,710 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,975 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,219 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,990 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,682 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,301 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,495 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,194 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,481 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,598 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,120 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,456 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,168 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,998 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,584 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,722 |
