| Countries of the Japanese Empire | 0 | - | 4.97 | 104,365 |
| The American Revolution | 0 | - | 4.52 | 54,292 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 427,016 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,758 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,577 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,706 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,846 |
| The Vietnam War | 0 | - | 4.44 | 35,575 |
| Confederate States of the U.S. Civil War | 0 | - | 4.91 | 129,398 |
| Vietnam War Countries | 0 | - | 4.82 | 94,354 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,302 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,073 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,707,917 |
| Random U.S. States on a Map | 0 | - | 4.96 | 627,741 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,456 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,449 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 81,402 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,065 |
| Countries in the Ottoman Empire | 0 | - | 4.89 | 72,795 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,198 |
| Hindu Countries | 0 | - | 4.86 | 50,296 |
| US Presidents - One Minute Sprint | 0 | - | 4.41 | 305,349 |
| Name a Valid U.S. President #2 | 0 | - | 4.54 | 70,210 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,449,674 |
| Asia Map Quiz | 0 | - | 4.99 | 919,523 |
| Modern-Day Countries of the Persian Empire on a Map | 0 | - | 4.98 | 70,099 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,897 |
| Modern-Day Countries of the Ottoman Empire on a Map | 0 | - | 4.96 | 82,983 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,286 |
| Countries Bordering China Since 1914 | 0 | - | 4.92 | 95,548 |
| Modern Day Countries of the Japanese Empire on a Map | 0 | - | 4.98 | 89,492 |
| United States Map Quiz | 0 | - | 4.98 | 4,163,432 |
| Arms Exports - United States | 0 | - | 4.77 | 62,521 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,106 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,830 |
| The Franklin D. Roosevelt Presidency | 0 | - | 4.43 | 23,978 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,290 |
| The John F. Kennedy Presidency | 0 | - | 4.47 | 43,797 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,446 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,298 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 134,599 |
| South and Central Asia Map Quiz | 0 | - | 4.94 | 99,276 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,384,801 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,805 |
| The George W. Bush Presidency | 0 | - | 4.06 | 32,211 |
| U.S. President Scramble | 0 | - | 4.40 | 116,918 |
| U.S. Presidents With Facial Hair By Picture | 0 | - | 4.48 | 23,217 |
| People in Pictures with Barack Obama | 0 | - | 4.10 | 47,945 |
| California A-Z | 0 | - | 4.49 | 28,807 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,911 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 69,620 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,794 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,852 |
| Flags of Asia Quiz | 0 | - | 4.99 | 615,782 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,401 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 154,011 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 99,357 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 108,219 |
| Countries of Asia in 1900 | 0 | - | 4.50 | 58,091 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 127,230 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 107,774 |
| Countries of the Middle East | 0 | - | 4.96 | 201,658 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 33,013 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,519 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,345 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,816 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,760 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,808 |
| U.S. State Border Crossings | 0 | - | 4.97 | 96,602 |
| Name the U.S. National Parks | 0 | - | 4.86 | 60,103 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 239,743 |
| Total United States Immigration by Country | 0 | - | 4.91 | 111,862 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 75,606 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 174,824 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 244,806 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 80,034 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,934 |
| U.S. Senators by State | 0 | - | 4.44 | 39,998 |
| History of Florida | 0 | - | 4.45 | 9,842 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 74,398 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.85 | 66,388 |
| History of Texas | 0 | - | 4.43 | 14,652 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 40,026 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,275 |
| US States Quiz | 0 | - | 5.00 | 16,916,294 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 367,783 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,790 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,736 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,356 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,308 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,958 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,410 |
| Countries in the Byzantine Empire | 0 | - | 4.95 | 72,261 |
| Biggest Spanish Empire Countries | 0 | - | 4.91 | 116,256 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,973 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 106,249 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,325 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,541 |
| "Stan" Countries - Map Quiz | 0 | - | 4.98 | 136,463 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 60,057 |
| Top 10 Richest Countries in Asia | 0 | - | 4.74 | 105,843 |
| Pixelated Asia Map | 0 | - | 4.90 | 73,384 |
| Monarchies of Asia | 0 | - | 4.97 | 71,216 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,210 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,015 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,499 |
| Syria Country Quiz | 0 | - | 4.81 | 32,880 |
| Jordan Country Quiz | 0 | - | 4.86 | 31,885 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 80,396 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,693 |
| China Cities Map Quiz | 0 | - | 4.94 | 105,428 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 93,892 |
| Japan Country Quiz | 0 | - | 4.93 | 142,726 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,573 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,462 |
| States of India Map Quiz | 0 | - | 4.83 | 26,600 |
| Countries Bordering India | 0 | - | 4.98 | 163,551 |
| Countries Closest to India | 0 | - | 4.97 | 102,932 |
| Modern Day Countries of the Mughal Empire on a Map | 0 | - | 4.42 | 33,706 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,423 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,703 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 39,232 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 333,078 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.48 | 52,054 |
| Pixelated United States Map | 0 | - | 4.88 | 94,458 |
| Most-Visited Countries by Americans | 0 | - | 4.86 | 109,936 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 91,984 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 146,678 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,725 |
| Countries that Beat the United States | 0 | - | 4.93 | 167,806 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,554 |
| Presidential Actors | 0 | - | 4.36 | 19,198 |
| U.S. Presidents to Win the Nobel Peace Prize | 0 | - | 4.34 | 18,334 |
| The Barack Obama Presidency | 0 | - | 4.13 | 25,423 |
| History of California | 0 | - | 4.40 | 18,768 |
| History of Georgia (U.S. State) | 0 | - | 4.30 | 13,240 |
| History of Illinois | 0 | - | 4.24 | 11,234 |
| History of Maryland | 0 | - | 4.06 | 6,701 |
| History of Massachusetts | 0 | - | 4.14 | 8,403 |
| History of Michigan | 0 | - | 4.26 | 6,958 |
| History of New York | 0 | - | 4.36 | 16,378 |
| History of New Jersey | 0 | - | 4.38 | 7,277 |
| History of Ohio | 0 | - | 4.14 | 7,359 |
| History of Tennessee | 0 | - | 4.29 | 7,674 |
| History of Washington State | 0 | - | 4.27 | 6,888 |
| U.S. History for Dummies | 0 | - | 4.47 | 83,190 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,642 |
| The American Civil War | 0 | - | 4.62 | 52,499 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 118,128 |
| Word Scramble - U.S. States | 0 | - | 4.95 | 507,833 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 111,702 |
| 10 Southernmost U.S. States | 0 | - | 4.89 | 113,664 |
| U.S. States with Short Names | 0 | - | 4.91 | 149,325 |
| U.S. States that Start with M | 0 | - | 4.93 | 187,629 |
| U.S. States By Population | 0 | - | 4.92 | 153,732 |
| U.S. States that Start with N | 0 | - | 4.95 | 171,699 |
| U.S. States with Longest Names | 0 | - | 4.84 | 44,590 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.52 | 66,591 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 54,531 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 48,834 |
| US States with an Empty Map | 0 | - | 5.00 | 625,943 |
| 10 Northernmost U.S. States | 0 | - | 4.90 | 82,695 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,329 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 88,495 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 64,330 |
| The Only Remaining U.S. State . . . | 0 | - | 4.93 | 65,788 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,575 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,670 |
| Top 10 Largest U.S. States by Area | 0 | - | 4.95 | 160,279 |
| Top 10 Smallest U.S. States by Area | 0 | - | 4.98 | 177,943 |
| Top 10 Poorest U.S. States by Median Income | 0 | - | 4.86 | 125,407 |
| U.S. States with the Highest Percentage of Hispanics | 0 | - | 4.85 | 69,660 |
| Top 10 Newest U.S. States | 0 | - | 4.85 | 86,441 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,346 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,934 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 82,605 |
| Top 10 U.S. States Where the Rent is Too Dang High | 0 | - | 4.85 | 67,713 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 96,362 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,998 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,942 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 133,494 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,359 |
| Countries that Bordered the USSR | 0 | - | 4.93 | 165,642 |
| Modern Day Countries of Austria-Hungary on a Map | 0 | - | 4.98 | 104,067 |
| The United States... or the United Kingdom? | 0 | - | 4.87 | 98,728 |
| Commonwealth of Nations Countries | 0 | - | 4.94 | 237,674 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,621 |
| Prime Ministers of the UK | 0 | - | 4.95 | 440,023 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,523 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,659 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,721 |
| Countries Closest to Turkey | 0 | - | 4.96 | 126,558 |
| Countries Bordering Turkey | 0 | - | 4.98 | 117,512 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,653 |
| Countries Bordering Saudi Arabia | 0 | - | 4.96 | 132,082 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,731 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,709 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,101 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 94,131 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,880 |
