| U.S. Presidents by Picture | 0 | - | 4.85 | 398,665 |
| Play-Doh Presidents | 0 | - | 5.00 | 76,140 |
| Name a Valid U.S. President #1 | 0 | - | 4.93 | 170,158 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,226,190 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 357,074 |
| The John F. Kennedy Presidency | 0 | - | 4.45 | 41,286 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.47 | 21,201 |
| People in Pictures with Barack Obama | 0 | - | 4.11 | 45,430 |
| US Presidents - 1 Minute Sprint | 0 | - | 4.43 | 282,727 |
| U.S. President Scramble | 0 | - | 4.42 | 107,953 |
| Name a Valid U.S. President #2 | 0 | - | 4.52 | 62,311 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.41 | 22,666 |
| Presidential Actors | 0 | - | 4.34 | 18,002 |
| The George W. Bush Presidency | 0 | - | 4.06 | 31,058 |
| The Barack Obama Presidency | 0 | - | 4.17 | 23,793 |
| Random U.S. States on a Map | 0 | - | 4.95 | 512,081 |
| U.S. Vice Presidents | 0 | - | 4.42 | 121,980 |
| U.S. Presidential Quotes | 0 | - | 4.36 | 42,931 |
| U.S. Presidential Trivia #1 | 0 | - | 4.52 | 98,635 |
| Losing U.S. Presidential Candidates in History | 0 | - | 4.57 | 83,211 |
| U.S. Presidential Trivia #2 | 0 | - | 4.51 | 45,413 |
| Assassinated U.S. Presidents | 0 | - | 4.54 | 80,996 |
| Ten Least Guessed U.S. Presidents | 0 | - | 4.45 | 33,809 |
| George Bush... or George Bush | 0 | - | 3.89 | 7,760 |
| Random U.S. Presidents by Picture | 0 | - | 4.37 | 60,900 |
| People in Pictures with Ronald Reagan | 0 | - | 4.36 | 37,970 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.32 | 16,972 |
| Vietnam War Countries | 0 | - | 4.81 | 87,444 |
| Governors Who Ran For President | 0 | - | 4.47 | 19,009 |
| U.S. Presidents by Event | 0 | - | 4.58 | 29,441 |
| First Ladies of the United States | 0 | - | 4.27 | 80,725 |
| Presidential Middle Names | 0 | - | 4.37 | 56,540 |
| The Bill Clinton Presidency | 0 | - | 4.18 | 30,327 |
| The George H. W. Bush Presidency | 0 | - | 4.35 | 20,659 |
| The Ronald Reagan Presidency | 0 | - | 4.25 | 23,764 |
| The Richard Nixon Presidency | 0 | - | 4.10 | 20,968 |
| The Jimmy Carter Presidency | 0 | - | 4.39 | 18,175 |
| The Abraham Lincoln Presidency | 0 | - | 4.52 | 24,993 |
| U.S. Presidents in Order - Whammies | 0 | - | 4.32 | 66,313 |
| U.S. Presidents Who Died in Office | 0 | - | 4.76 | 31,540 |
| Random U.S. Vice President to President | 0 | - | 4.55 | 28,367 |
| U.S. Vice Presidents Who Became President | 0 | - | 4.63 | 14,168 |
| Add a Letter - Make a U.S. President | 0 | - | 4.66 | 22,253 |
| Deadliest U.S. Wars | 0 | - | 4.83 | 160,038 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 123,316 |
| U.S. Senators by State | 0 | - | 4.49 | 36,748 |
| The American Revolution | 0 | - | 4.55 | 52,060 |
| Six Flags Over Texas | 0 | - | 4.84 | 59,416 |
| Random Sequential U.S. States on a Map | 0 | - | 4.99 | 220,726 |
| Vatican City Country Quiz | 0 | - | 4.50 | 40,043 |
| The Iraq War | 0 | - | 4.45 | 14,519 |
| United States Map Quiz | 0 | - | 4.98 | 3,933,755 |
| U.S. Presidential Running Mates | 0 | - | 4.39 | 26,166 |
| US Presidents Breakdown Puzzle #1 | 0 | - | 3.73 | 19,362 |
| The George Washington Presidency | 0 | - | 4.02 | 13,730 |
| The Thomas Jefferson Presidency | 0 | - | 4.26 | 12,949 |
| The John Adams Presidency | 0 | - | 4.10 | 8,050 |
| Franklin... or Theodore Roosevelt | 0 | - | 4.34 | 10,769 |
| The Theodore Roosevelt Presidency | 0 | - | 4.33 | 7,191 |
| U.S. Presidential Knowledge - Multiple Choice | 0 | - | 4.32 | 20,657 |
| U.S. Vice Presidential Trivia | 0 | - | 4.31 | 11,636 |
| U.S. Presidential Last Names as Baby Names | 0 | - | 4.20 | 30,700 |
| The Kennedy Family | 0 | - | 3.84 | 13,400 |
| Cartoon Versions of U.S. States | 0 | - | 4.82 | 53,242 |
| Third Most Common Language by U.S. State | 0 | - | 4.90 | 108,199 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.92 | 51,753 |
| Countries of the Soviet Union | 0 | - | 4.98 | 186,139 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 75,313 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 95,387 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 102,369 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.84 | 55,857 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 95,247 |
| U.S. State Border Crossings | 0 | - | 4.96 | 82,995 |
| U.S. Citizenship Test Questions | 0 | - | 4.86 | 224,253 |
| Total United States Immigration by Country | 0 | - | 4.90 | 98,230 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 66,481 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.93 | 149,446 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.94 | 189,098 |
| All U.S. Supreme Court Justices | 0 | - | 4.49 | 27,463 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 68,131 |
| Most-Visited Countries by U.S. Presidents | 0 | - | 4.97 | 180,391 |
| Cities and Towns of Massachusetts | 0 | - | 4.90 | 62,261 |
| U.S. Civil War Decoder | 0 | - | 4.17 | 24,228 |
| US States Quiz | 0 | - | 5.00 | 14,999,115 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.97 | 343,405 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 135,784 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 64,504 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.94 | 51,102 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 60,288 |
| Countries of Europe in 1360 with a Map | 0 | - | 4.99 | 47,508 |
| Modern Day Countries of the Spanish Empire on a Map | 0 | - | 4.96 | 77,064 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 91,353 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 224,266 |
| Most-Visited Countries by Popes | 0 | - | 4.65 | 77,568 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 61,816 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 67,744 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 88,619 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 79,289 |
| Biggest Mongol Empire Countries | 0 | - | 4.91 | 68,160 |
| Most Guessed North American Teams by Sport | 0 | - | 4.30 | 57,152 |
| 10 Longest Rivers in the United States | 0 | - | 4.82 | 35,442 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.96 | 282,010 |
| Pixelated United States Map | 0 | - | 4.90 | 83,779 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 95,347 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 80,339 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 126,116 |
| Countries that Beat the United States | 0 | - | 4.92 | 148,168 |
| U.S. Presidents True or False | 0 | - | 3.94 | 14,702 |
| California A-Z | 0 | - | 4.48 | 27,941 |
| Top 10 Los Angeles Lakers of All-Time | 0 | - | 4.34 | 42,650 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.85 | 22,514 |
| Embarrassing Chapters in US History | 0 | - | 4.15 | 31,673 |
| U.S. History for Dummies | 0 | - | 4.50 | 66,332 |
| The American Civil War | 0 | - | 4.74 | 49,486 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 102,140 |
| Word Scramble - U.S. States | 0 | - | 4.96 | 464,472 |
| U.S. States with the Letter Y | 0 | - | 4.86 | 97,829 |
| 10 Southernmost U.S. States | 0 | - | 4.86 | 100,815 |
| U.S. States with Short Names | 0 | - | 4.87 | 132,088 |
| U.S. States that Start with M | 0 | - | 4.91 | 152,674 |
| U.S. States By Population | 0 | - | 4.90 | 131,476 |
| U.S. States that Start with N | 0 | - | 4.95 | 157,448 |
| U.S. States with Longest Names | 0 | - | 4.84 | 36,837 |
| Louisiana Purchase with a Map | 0 | - | 4.95 | 37,355 |
| US States with an Empty Map | 0 | - | 5.00 | 562,815 |
| 10 Northernmost U.S. States | 0 | - | 4.89 | 74,761 |
| U.S. States with a Unique First Letter | 0 | - | 4.95 | 78,984 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 59,011 |
| The Only Remaining U.S. State . . . | 0 | - | 4.94 | 57,105 |
| U.S. States with the Longest International Borders | 0 | - | 4.81 | 42,449 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 146,835 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 168,804 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.85 | 99,844 |
| Top 10 Least Obese U.S. States | 0 | - | 4.81 | 69,367 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 91,053 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 74,510 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 73,006 |
| U.S. States or European Countries by Population | 0 | - | 4.98 | 117,389 |
| Countries that Bordered the USSR | 0 | - | 4.94 | 154,499 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 90,664 |
| Ultimate Harry Potter Name Game | 0 | - | 4.95 | 467,633 |
| The Persian Gulf War | 0 | - | 4.00 | 7,789 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 73,056 |
| The Vietnam War | 0 | - | 4.41 | 33,185 |
| Random American Countries on a Map | 0 | - | 4.96 | 87,857 |
| Rivers of the United States | 0 | - | 4.92 | 58,107 |
| Countries Closest to United States A-Z | 0 | - | 4.84 | 108,595 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.33 | 10,535 |
| Countries Closest to Alaska | 0 | - | 4.92 | 100,352 |
| History of Florida | 0 | - | 4.44 | 8,845 |
| The Life of Martin Luther King Jr. | 0 | - | 4.80 | 10,456 |
| Hawaiian Islands | 0 | - | 4.86 | 38,926 |
| Countries Closest to Maine | 0 | - | 4.86 | 59,889 |
| History of Texas | 0 | - | 4.41 | 13,621 |
| U.S. States that Border Tennessee | 0 | - | 4.84 | 58,090 |
| American History Quotes #1 | 0 | - | 4.40 | 92,053 |
| People on Money - United States | 0 | - | 4.31 | 61,982 |
| American History Quotes #2 | 0 | - | 4.38 | 39,524 |
| Old West History | 0 | - | 4.29 | 14,831 |
| U.S. History Groups of Two | 0 | - | 4.25 | 42,066 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.18 | 41,706 |
| Life of Benjamin Franklin | 0 | - | 4.20 | 6,254 |
| American Revolution - Multiple Choice | 0 | - | 4.32 | 18,968 |
| Last Names in U.S. History #1 | 0 | - | 4.24 | 34,485 |
| Last Names in U.S. History #2 | 0 | - | 4.42 | 16,213 |
| Fifty US States in One Minute | 0 | - | 4.57 | 3,288,141 |
| U.S. State Flags | 0 | - | 4.88 | 140,368 |
| U.S. States that Border Canada | 0 | - | 4.90 | 167,010 |
| Name a Valid U.S. State #1 | 0 | - | 4.95 | 187,610 |
| Category Elimination - U.S. States #1 | 0 | - | 4.90 | 197,657 |
| Great Plains States and Provinces on a Map | 0 | - | 4.94 | 39,276 |
| Top 10 Coldest U.S. States | 0 | - | 4.91 | 102,124 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 108,541 |
| Top 10 Most Native American U.S. States | 0 | - | 4.84 | 72,668 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 57,555 |
| U.S. State Shapes Quiz #2 | 0 | - | 4.82 | 91,547 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 52,519 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 149,877 |
| U.S. States or European Countries by GDP | 0 | - | 4.98 | 78,252 |
| States of the Holy Roman Empire in 1356 | 0 | - | 4.97 | 59,572 |
| Modern Countries Conquered by Alexander the Great | 0 | - | 4.91 | 100,610 |
| Biggest Roman Empire Countries | 0 | - | 4.88 | 83,017 |
| U.S. History Multiple Choice #5 | 0 | - | 4.36 | 10,599 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 67,466 |
| Biggest British Empire Countries | 0 | - | 4.69 | 80,623 |
| Groups of Things - Harry Potter | 0 | - | 4.85 | 263,880 |
| Top 100 Harry Potter Characters by Mention | 0 | - | 4.93 | 354,353 |
| Countries of Asia in 1900 | 0 | - | 4.49 | 54,073 |
| Random Sequential Asian Countries on a Map | 0 | - | 4.99 | 109,303 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 99,338 |
| Colonies of Africa with a Map | 0 | - | 4.79 | 49,124 |
| Random Sequential African Countries on a Map | 0 | - | 5.00 | 117,806 |
| Most-Spoken Languages of the United States | 0 | - | 4.45 | 165,666 |
| U.S. State Nicknames Quiz | 0 | - | 4.48 | 46,788 |
| U.S. National Parks Quiz | 0 | - | 4.78 | 47,745 |
| Territories of the United States | 0 | - | 4.76 | 49,007 |
| Countries with American Expatriates | 0 | - | 4.58 | 41,166 |
| Five Biggest Immigrant Groups by Decade in the US | 0 | - | 4.79 | 34,662 |
| Most Mentioned Enemies of the USA | 0 | - | 4.79 | 162,030 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.38 | 7,914 |
