| Countries of the Japanese Empire | 0 | - | 4.97 | 104,007 |
| The American Revolution | 0 | - | 4.52 | 54,128 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,716 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,844 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,519 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,557 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,797 |
| The Vietnam War | 0 | - | 4.43 | 35,378 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,871 |
| Vietnam War Countries | 0 | - | 4.83 | 93,846 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,215 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,232 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,670,347 |
| Random U.S. States on a Map | 0 | - | 4.96 | 623,272 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,615 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 118,598 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,906 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,652 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,410 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,579 |
| Hindu Countries | 0 | - | 4.86 | 49,784 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 304,040 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,623 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,408 |
| Asia Map Quiz | 0 | - | 4.99 | 910,055 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,452 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,333 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,143 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,820 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,907 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,747 |
| United States Map Quiz | 0 | - | 4.98 | 4,147,070 |
| Arms Exports - United States | 0 | - | 4.75 | 61,688 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,948 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,693 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,856 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,208 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,560 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,120 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,346 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,121 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 98,080 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,378,691 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,506 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,118 |
| U.S. President Scramble | 0 | - | 4.40 | 116,409 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,072 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,761 |
| California A-Z | 0 | - | 4.49 | 28,737 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 68,163 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,149 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,427 |
| Flags of Asia Quiz | 0 | - | 4.99 | 608,286 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 109,765 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 153,139 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 98,675 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 107,532 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,735 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 126,190 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 106,888 |
| Countries of the Middle East | 0 | - | 4.96 | 199,681 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,458 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,278 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 57,937 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,497 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,099 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,692 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,156 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,496 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,722 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,951 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,110 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,654 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 241,999 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,826 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,648 |
| U.S. Senators by State | 0 | - | 4.45 | 39,829 |
| History of Florida | 0 | - | 4.45 | 9,786 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,368 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,854 |
| History of Texas | 0 | - | 4.43 | 14,575 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,653 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,130 |
| US States Quiz | 0 | - | 5.00 | 16,763,585 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,978 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,925 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,426 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 143,716 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,113 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,866 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 115,346 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,735 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 105,420 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,652 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,706 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 134,482 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,764 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 105,153 |
| Pixelated Asia Map | 0 | - | 4.90 | 72,716 |
| Monarchies of Asia | 0 | - | 4.97 | 70,782 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,388 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,581 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,123 |
| Syria Country Quiz | 0 | - | 4.81 | 32,510 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 79,695 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,033 |
| China Cities Map Quiz | 0 | - | 4.93 | 104,559 |
| Provinces of China Map Quiz | 0 | - | 4.91 | 93,101 |
| Japan Country Quiz | 0 | - | 4.92 | 141,786 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,030 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,982 |
| States of India Map Quiz | 0 | - | 4.83 | 26,200 |
| Countries Bordering India | 0 | - | 4.98 | 163,151 |
| Countries Closest to India | 0 | - | 4.97 | 102,419 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,377 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,448 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,170 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,912 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,406 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,462 |
| Pixelated United States Map | 0 | - | 4.89 | 93,749 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,905 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,176 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,748 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,467 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,048 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,413 |
| Presidential Actors | 0 | - | 4.36 | 19,104 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,258 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,303 |
| History of California | 0 | - | 4.40 | 18,712 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,192 |
| History of Illinois | 0 | - | 4.24 | 11,191 |
| History of Maryland | 0 | - | 4.06 | 6,665 |
| History of Massachusetts | 0 | - | 4.14 | 8,351 |
| History of Michigan | 0 | - | 4.26 | 6,917 |
| History of New York | 0 | - | 4.36 | 16,305 |
| History of New Jersey | 0 | - | 4.38 | 7,224 |
| History of Ohio | 0 | - | 4.14 | 7,319 |
| History of Tennessee | 0 | - | 4.29 | 7,642 |
| History of Washington State | 0 | - | 4.27 | 6,848 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,684 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,541 |
| The American Civil War | 0 | - | 4.62 | 52,253 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 117,239 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 503,677 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,833 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,822 |
| U.S. States with Short Names | 0 | - | 4.91 | 148,239 |
| U.S. States that Start with M | 0 | - | 4.93 | 186,473 |
| U.S. States By Population | 0 | - | 4.92 | 152,717 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,805 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,113 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,308 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,521 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,992 |
| US States with an Empty Map | 0 | - | 5.00 | 620,897 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,128 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,119 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,885 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,944 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 65,196 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,356 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,531 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 159,421 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,296 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,768 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,250 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,916 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,173 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,338 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,145 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,109 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,204 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,658 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,350 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,390 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,382 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,813 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 103,095 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,062 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,758 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,575 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,249 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.91 | 96,263 |
| Countries Bordering Iran | 0 | - | 4.83 | 94,976 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,027 |
| Countries Closest to Turkey | 0 | - | 4.96 | 125,621 |
| Countries Bordering Turkey | 0 | - | 4.98 | 116,740 |
| Egypt Country Quiz | 0 | - | 4.82 | 77,210 |
| Countries Bordering Saudi Arabia | 0 | - | 4.95 | 118,363 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,139 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,197 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,439 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 93,658 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,237 |
| China A-Z | 0 | - | 4.55 | 66,921 |
| Countries that Beat China | 0 | - | 4.86 | 115,098 |
| Countries that Border China | 0 | - | 4.96 | 262,366 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,133 |
