| Countries of the Japanese Empire | 0 | - | 4.97 | 103,863 |
| The American Revolution | 0 | - | 4.52 | 54,058 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,788 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,481 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,877 |
| Countries of Europe After World War II | 0 | - | 4.99 | 186,755 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,360 |
| The Vietnam War | 0 | - | 4.43 | 35,297 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 128,691 |
| Vietnam War Countries | 0 | - | 4.83 | 93,619 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,187 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,909 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,655,018 |
| Random U.S. States on a Map | 0 | - | 4.96 | 621,569 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,280 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.85 | 113,258 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,689 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,269 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,285 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,361 |
| Hindu Countries | 0 | - | 4.86 | 49,589 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 303,393 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 69,428 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,440,543 |
| Asia Map Quiz | 0 | - | 4.99 | 907,114 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 69,221 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 81,814 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,687 |
| Countries Bordering China Since 1914 | 0 | - | 4.93 | 94,735 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 88,458 |
| United States Map Quiz | 0 | - | 4.98 | 4,142,018 |
| Arms Exports - United States | 0 | - | 4.70 | 54,364 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,883 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,670 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,816 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,594 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,483 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,015 |
| Category Elimination - U.S. States #1 | 0 | - | 4.87 | 218,567 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 132,523 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 97,480 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,375,971 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,380 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,089 |
| U.S. President Scramble | 0 | - | 4.40 | 116,207 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,027 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,696 |
| California A-Z | 0 | - | 4.49 | 28,708 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,467 |
| Countries of the Soviet Union | 0 | - | 4.98 | 193,850 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,243 |
| Flags of Asia Quiz | 0 | - | 4.99 | 605,648 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 109,353 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 152,773 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 98,427 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 107,259 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 57,626 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 125,722 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 106,502 |
| Countries of the Middle East | 0 | - | 4.96 | 198,945 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,220 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.68 | 55,179 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 57,779 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,335 |
| African Countries with the Most Christians | 0 | - | 4.94 | 74,869 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,368 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,962 |
| Name the U.S. National Parks | 0 | - | 4.86 | 59,009 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,346 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,667 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,879 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,184 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,953 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,740 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,530 |
| U.S. Senators by State | 0 | - | 4.45 | 39,757 |
| History of Florida | 0 | - | 4.45 | 9,764 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,082 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,632 |
| History of Texas | 0 | - | 4.43 | 14,554 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,501 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,078 |
| US States Quiz | 0 | - | 5.00 | 16,702,635 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,290 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,269 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,961 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 143,192 |
| Countries Italy Declared War On | 0 | - | 4.75 | 42,960 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 71,737 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 114,898 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,300 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 105,058 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,496 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,369 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 133,801 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,656 |
| Top 10 Richest Countries in Asia | 0 | - | 4.73 | 104,804 |
| Pixelated Asia Map | 0 | - | 4.90 | 72,420 |
| Monarchies of Asia | 0 | - | 4.97 | 70,611 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,062 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,434 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 82,982 |
| Syria Country Quiz | 0 | - | 4.81 | 32,323 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 79,462 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 100,809 |
| China Cities Map Quiz | 0 | - | 4.93 | 104,055 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 92,784 |
| Japan Country Quiz | 0 | - | 4.92 | 141,270 |
| Closest Countries to North Korea | 0 | - | 4.94 | 121,812 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,790 |
| States of India Map Quiz | 0 | - | 4.82 | 26,039 |
| Countries Bordering India | 0 | - | 4.98 | 162,605 |
| Countries Closest to India | 0 | - | 4.97 | 102,214 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,228 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,184 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 60,961 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,809 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 328,060 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.50 | 39,901 |
| Pixelated United States Map | 0 | - | 4.89 | 93,493 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,484 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,863 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,428 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,349 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,587 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,377 |
| Presidential Actors | 0 | - | 4.36 | 19,067 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,216 |
| The Barack Obama Presidency | 0 | - | 4.16 | 25,258 |
| History of California | 0 | - | 4.40 | 18,695 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,179 |
| History of Illinois | 0 | - | 4.24 | 11,176 |
| History of Maryland | 0 | - | 4.06 | 6,648 |
| History of Massachusetts | 0 | - | 4.14 | 8,331 |
| History of Michigan | 0 | - | 4.26 | 6,903 |
| History of New York | 0 | - | 4.36 | 16,282 |
| History of New Jersey | 0 | - | 4.38 | 7,207 |
| History of Ohio | 0 | - | 4.14 | 7,308 |
| History of Tennessee | 0 | - | 4.29 | 7,633 |
| History of Washington State | 0 | - | 4.27 | 6,839 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,487 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,498 |
| The American Civil War | 0 | - | 4.62 | 52,162 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,745 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 501,926 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,374 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,427 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,682 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,925 |
| U.S. States By Population | 0 | - | 4.92 | 152,382 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,410 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,869 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,189 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 52,173 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,597 |
| US States with an Empty Map | 0 | - | 5.00 | 618,889 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 81,908 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,033 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,560 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,767 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,891 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,276 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,482 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 158,888 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,088 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 124,499 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,073 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 85,664 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,092 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,109 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,941 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.84 | 66,846 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,728 |
| Top 10 Richest Countries in Europe | 0 | - | 4.91 | 148,161 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,113 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,961 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 88,979 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 164,500 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 102,645 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 97,849 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 236,325 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,546 |
| Prime Ministers of the UK | 0 | - | 4.96 | 434,685 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,154 |
| Countries Bordering Iran | 0 | - | 4.83 | 94,792 |
| Countries that Border Iraq | 0 | - | 4.97 | 107,854 |
| Biggest Trading Partners - Turkey | 0 | - | 4.80 | 50,184 |
| Countries Closest to Turkey | 0 | - | 4.96 | 125,355 |
| Countries Bordering Turkey | 0 | - | 4.98 | 116,493 |
| Egypt Country Quiz | 0 | - | 4.82 | 77,037 |
| Countries Bordering Saudi Arabia | 0 | - | 4.95 | 118,233 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 54,897 |
| Countries Closest to Indonesia | 0 | - | 4.96 | 103,972 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,188 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 93,513 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,089 |
| China A-Z | 0 | - | 4.55 | 66,734 |
| Countries that Beat China | 0 | - | 4.86 | 114,721 |
| Countries that Border China | 0 | - | 4.96 | 261,830 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 76,942 |
