| The Persian Gulf War | 0 | - | 4.02 | 8,438 |
| Countries of the Japanese Empire | 0 | - | 4.97 | 104,121 |
| The American Revolution | 0 | - | 4.52 | 54,195 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,582 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,159 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,143 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,917 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,129 |
| The Vietnam War | 0 | - | 4.44 | 35,459 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,041 |
| Vietnam War Countries | 0 | - | 4.83 | 94,006 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,244 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,522 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,684,237 |
| Random U.S. States on a Map | 0 | - | 4.96 | 624,640 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,888 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 120,732 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,096 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,380 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,516 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,767 |
| Hindu Countries | 0 | - | 4.86 | 49,950 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,505 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,805 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,445,573 |
| Asia Map Quiz | 0 | - | 4.99 | 913,268 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,630 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,490 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,386 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,929 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 95,052 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,993 |
| United States Map Quiz | 0 | - | 4.98 | 4,151,353 |
| Arms Exports - United States | 0 | - | 4.75 | 62,195 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,041 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,748 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,909 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 380,848 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,645 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,252 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,152 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,706 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 98,483 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,380,329 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,613 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,156 |
| U.S. President Scramble | 0 | - | 4.40 | 116,582 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,124 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,825 |
| California A-Z | 0 | - | 4.49 | 28,764 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,639 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,374 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,559 |
| Flags of Asia Quiz | 0 | - | 4.99 | 610,668 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,014 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 153,424 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 98,886 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 107,742 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,866 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 126,552 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 107,172 |
| Countries of the Middle East | 0 | - | 4.96 | 200,568 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,652 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,371 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,076 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,619 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,322 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,943 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,321 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,715 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,062 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,235 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,286 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,063 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 242,917 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,910 |
| U.S. Cabinet Departments | 0 | - | 4.85 | 72,765 |
| U.S. Senators by State | 0 | - | 4.45 | 39,881 |
| History of Florida | 0 | - | 4.45 | 9,803 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,650 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,016 |
| History of Texas | 0 | - | 4.43 | 14,597 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,771 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,204 |
| US States Quiz | 0 | - | 5.00 | 16,814,864 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 366,438 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 198,415 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,765 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,629 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,147 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,225 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,993 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,639 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,113 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 105,694 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,776 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,962 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 135,092 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,863 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,383 |
| Pixelated Asia Map | 0 | - | 4.90 | 72,938 |
| Monarchies of Asia | 0 | - | 4.97 | 70,921 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,660 |
| Asian Country Superlatives | 0 | - | 4.85 | 80,741 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,241 |
| Syria Country Quiz | 0 | - | 4.81 | 32,624 |
| Jordan Country Quiz | 0 | - | 4.86 | 31,637 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 79,877 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,250 |
| China Cities Map Quiz | 0 | - | 4.94 | 104,838 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 93,340 |
| Japan Country Quiz | 0 | - | 4.93 | 142,119 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,213 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,137 |
| States of India Map Quiz | 0 | - | 4.83 | 26,316 |
| Countries Bordering India | 0 | - | 4.98 | 163,278 |
| Countries Closest to India | 0 | - | 4.97 | 102,578 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,499 |
| Top 10 Richest Countries in Africa | 0 | - | 4.86 | 75,683 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,347 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,063 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 330,652 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,904 |
| Pixelated United States Map | 0 | - | 4.87 | 93,994 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 109,238 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,439 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,048 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,552 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,417 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,493 |
| Presidential Actors | 0 | - | 4.36 | 19,140 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,288 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,349 |
| History of California | 0 | - | 4.40 | 18,733 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,203 |
| History of Illinois | 0 | - | 4.24 | 11,207 |
| History of Maryland | 0 | - | 4.06 | 6,676 |
| History of Massachusetts | 0 | - | 4.14 | 8,372 |
| History of Michigan | 0 | - | 4.26 | 6,929 |
| History of New York | 0 | - | 4.36 | 16,328 |
| History of New Jersey | 0 | - | 4.38 | 7,242 |
| History of Ohio | 0 | - | 4.14 | 7,328 |
| History of Tennessee | 0 | - | 4.29 | 7,650 |
| History of Washington State | 0 | - | 4.27 | 6,865 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,870 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,581 |
| The American Civil War | 0 | - | 4.62 | 52,346 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,571 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 505,006 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,079 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 113,100 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,607 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,852 |
| U.S. States By Population | 0 | - | 4.92 | 152,940 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,097 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,279 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,402 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,861 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,296 |
| US States with an Empty Map | 0 | - | 5.00 | 622,483 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,320 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,172 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,066 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,068 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,401 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,446 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,578 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,703 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,464 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,983 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,402 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,068 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,232 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,533 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,303 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,325 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,613 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,035 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,558 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,781 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,669 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,081 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,398 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,296 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,072 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,589 |
| Prime Ministers of the UK | 0 | - | 4.95 | 437,351 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,362 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,105 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,184 |
| Countries Closest to Turkey | 0 | - | 4.96 | 125,814 |
| Countries Bordering Turkey | 0 | - | 4.98 | 116,921 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,349 |
| Countries Bordering Saudi Arabia | 0 | - | 4.95 | 118,473 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,334 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,357 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,632 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 93,809 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,382 |
| China A-Z | 0 | - | 4.55 | 67,062 |
