| Countries of the Japanese Empire | 0 | - | 4.97 | 104,347 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,657 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,792 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,712 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,045 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,012 |
| Prime Ministers of the UK | 0 | - | 4.95 | 439,872 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,421 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,171 |
| Hindu Countries | 0 | - | 4.86 | 50,272 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,396 |
| Byzantine History | 0 | - | 4.91 | 28,907 |
| Byzantine Emperors | 0 | - | 4.92 | 14,337 |
| The Vietnam War | 0 | - | 4.44 | 35,568 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 437,776 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,245 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,449,392 |
| Asia Map Quiz | 0 | - | 4.99 | 918,955 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,384,532 |
| The Iraq War | 0 | - | 4.47 | 15,670 |
| The American Revolution | 0 | - | 4.52 | 54,285 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,766 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 80,835 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,013 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 32,156 |
| Figures from Greek Mythology | 0 | - | 4.91 | 187,498 |
| The Dictator Files: Benito Mussolini | 0 | - | 4.65 | 23,487 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,851 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,620 |
| Flags of Asia Quiz | 0 | - | 4.99 | 615,444 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,364 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 153,958 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 99,328 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 108,181 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 127,166 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 107,726 |
| Top Asian Languages on a Map | 0 | - | 4.95 | 71,608 |
| South and Central Asia Map Quiz | 0 | - | 4.94 | 99,196 |
| Countries of Asia with an Empty Map | 0 | - | 4.98 | 230,687 |
| All First-Level Subdivisions of Asia on a Map | 0 | - | 4.91 | 50,068 |
| Countries of the Middle East | 0 | - | 4.96 | 201,565 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,989 |
| States of India | 0 | - | 4.95 | 193,963 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,507 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,332 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,794 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,733 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,765 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,996 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,706,234 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,610 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,732 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 150,671 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 83,108 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,017 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,266 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,167 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,892 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,922 |
| Name the English Monarchs | 0 | - | 4.91 | 503,684 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,642 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 106,199 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,068 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,498 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 135,298 |
| Pixelated Asia Map | 0 | - | 4.90 | 73,357 |
| Monarchies of Asia | 0 | - | 4.97 | 71,184 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,287 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,029 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,184 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,987 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,469 |
| The Persian Gulf War | 0 | - | 4.02 | 8,460 |
| Provinces of Turkey | 0 | - | 4.95 | 204,557 |
| Syria Country Quiz | 0 | - | 4.81 | 32,872 |
| Jordan Country Quiz | 0 | - | 4.86 | 31,864 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 80,339 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,661 |
| Provinces of China | 0 | - | 4.97 | 205,448 |
| China Cities Map Quiz | 0 | - | 4.94 | 105,384 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 93,856 |
| Japanese Prefectures | 0 | - | 4.98 | 137,442 |
| Japan Country Quiz | 0 | - | 4.93 | 142,681 |
| Battle to Country | 0 | - | 4.91 | 53,490 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,537 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,434 |
| Bhutan Country Quiz | 0 | - | 4.87 | 24,259 |
| States of India Map Quiz | 0 | - | 4.83 | 26,587 |
| History of India | 0 | - | 4.62 | 21,447 |
| Countries Bordering India | 0 | - | 4.98 | 163,534 |
| Countries Closest to India | 0 | - | 4.97 | 102,920 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,395 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,681 |
| Arms Exports - United States | 0 | - | 4.77 | 62,500 |
| The American Civil War | 0 | - | 4.62 | 52,479 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,948 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,926 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 90,312 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,543 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,856 |
| The Trojan War | 0 | - | 4.83 | 39,785 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 648,561 |
| Name that Greek Letter | 0 | - | 4.93 | 324,096 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,136 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,629 |
| Roman Emperors | 0 | - | 4.95 | 120,320 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,514 |
| Topological Map of Asia Quiz | 0 | - | 4.81 | 20,210 |
| Qatar Country Quiz | 0 | - | 4.86 | 31,578 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,607 |
| History of Iran | 0 | - | 4.66 | 16,372 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,681 |
| Countries Closest to Turkey | 0 | - | 4.96 | 126,348 |
| Countries Bordering Turkey | 0 | - | 4.98 | 117,467 |
| History of Egypt | 0 | - | 4.58 | 24,056 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,631 |
| Countries Bordering Saudi Arabia | 0 | - | 4.96 | 130,933 |
| Countries Closest to Yemen | 0 | - | 4.92 | 22,619 |
| Oman Country Quiz | 0 | - | 4.86 | 26,958 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,698 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,686 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,073 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 94,102 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,835 |
| Brunei Country Quiz | 0 | - | 4.87 | 21,973 |
| Chinese Inventions | 0 | - | 4.30 | 33,815 |
| History of China | 0 | - | 4.37 | 57,289 |
| China A-Z | 0 | - | 4.55 | 67,343 |
| Countries that Beat China | 0 | - | 4.85 | 116,067 |
| Countries that Border China | 0 | - | 4.96 | 263,475 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,539 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,244 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,792 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,301 |
| Countries in World War I | 0 | - | 4.88 | 228,397 |
| The Life of Gandhi | 0 | - | 4.37 | 13,061 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,390 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 426,919 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 382,192 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,291 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 221,204 |
| Category Elimination - U.S. States #2 | 0 | - | 4.83 | 134,525 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,884 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,559 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,148 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,629 |
| Countries of the German Empire | 0 | - | 4.51 | 38,004 |
| Olympian Gods Quiz | 0 | - | 4.96 | 501,666 |
| Ancient Greek Words | 0 | - | 4.93 | 111,840 |
| Roman to Greek God | 0 | - | 4.52 | 122,982 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,387 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,829 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,500 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,059 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 388,599 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,707 |
| Countries and States in the Caucasus | 0 | - | 4.46 | 51,604 |
| Asian Countries by Borders in 30 Seconds | 0 | - | 4.45 | 415,814 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,019 |
| The Only Remaining Asian Country . . . | 0 | - | 4.64 | 45,906 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,578 |
| Middle Eastern Geography Quiz | 0 | - | 4.57 | 43,938 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,875 |
| Ottoman Empire Quiz | 0 | - | 4.37 | 17,161 |
| Countries Surrounding Istanbul | 0 | - | 4.89 | 24,863 |
| Countries Closest to Egypt | 0 | - | 4.83 | 101,171 |
| Countries that Beat Egypt | 0 | - | 4.88 | 57,103 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,860 |
| Countries Closest to Israel | 0 | - | 4.69 | 106,257 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,272 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 48,920 |
| Mongolia Country Quiz | 0 | - | 4.73 | 39,601 |
| Taiwan Country Quiz | 0 | - | 4.69 | 43,570 |
| Afghanistan Country Quiz | 0 | - | 4.45 | 43,393 |
| Kazakhstan Country Quiz | 0 | - | 4.74 | 36,471 |
| Bangladesh Country Quiz | 0 | - | 4.78 | 43,202 |
| Pakistan Country Quiz | 0 | - | 4.54 | 61,863 |
| India Country Quiz | 0 | - | 4.43 | 130,714 |
| India Cities Map Quiz | 0 | - | 4.67 | 61,172 |
| Countries of the Indian Diaspora | 0 | - | 4.45 | 59,449 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,529 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,994 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,338 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,100 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,827 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 192,484 |
| Play-Doh Presidents | 0 | - | 5.00 | 82,425 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,309 |
| Europe Map Quiz | 0 | - | 5.00 | 4,769,207 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 530,348 |
| History of Russia Quiz | 0 | - | 4.47 | 31,943 |
| History of France | 0 | - | 4.59 | 57,234 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,364 |
| Mythology A-Z | 0 | - | 4.31 | 37,270 |
| History of Italy | 0 | - | 4.55 | 32,041 |
| Countries of the Italian Empire | 0 | - | 4.21 | 27,725 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 126,145 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,183 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,714 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,288 |
