| Countries of the Japanese Empire | 0 | - | 4.97 | 104,690 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,676 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,741 |
| Neutral European Countries of WWII | 0 | - | 4.92 | 162,554 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 192,000 |
| Prime Ministers of the UK | 0 | - | 4.95 | 443,189 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 98,153 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,710 |
| Countries Italy Declared War On | 0 | - | 4.74 | 48,216 |
| Byzantine History | 0 | - | 4.91 | 29,051 |
| Byzantine Emperors | 0 | - | 4.93 | 14,664 |
| The Vietnam War | 0 | - | 4.44 | 35,691 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,676 |
| Hindu Countries | 0 | - | 4.86 | 50,674 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 440,466 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,618 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,453,470 |
| Asia Map Quiz | 0 | - | 4.99 | 926,808 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,388,067 |
| The Iraq War | 0 | - | 4.47 | 15,719 |
| The American Revolution | 0 | - | 4.52 | 54,389 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,701 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,232 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,221 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,511 |
| Figures from Greek Mythology | 0 | - | 4.91 | 191,988 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,884 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,657 |
| Flags of Asia Quiz | 0 | - | 4.99 | 621,992 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,943 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 154,731 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 100,083 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 109,329 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 128,032 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 108,492 |
| Top Asian Languages on a Map | 0 | - | 4.95 | 72,230 |
| South and Central Asia Map Quiz | 0 | - | 4.94 | 100,180 |
| Countries of Asia with an Empty Map | 0 | - | 4.98 | 231,905 |
| All First-Level Subdivisions of Asia on a Map | 0 | - | 4.92 | 50,803 |
| Countries of the Middle East | 0 | - | 4.96 | 203,281 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,242 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,731,296 |
| Canadian Prime Ministers | 0 | - | 4.64 | 58,010 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,984 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,562 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 86,057 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 66,019 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.97 | 72,022 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,673 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 146,077 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 119,045 |
| Name the English Monarchs | 0 | - | 4.91 | 507,409 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 67,113 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.90 | 107,081 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,817 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 136,299 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 137,755 |
| Pixelated Asia Map | 0 | - | 4.90 | 73,891 |
| Monarchies of Asia | 0 | - | 4.97 | 71,614 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 111,556 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,932 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,957 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,360 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,792 |
| Qatar Country Quiz | 0 | - | 4.86 | 31,758 |
| The Persian Gulf War | 0 | - | 4.02 | 8,490 |
| Provinces of Turkey | 0 | - | 4.95 | 206,323 |
| Syria Country Quiz | 0 | - | 4.80 | 33,114 |
| Jordan Country Quiz | 0 | - | 4.86 | 32,143 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 80,944 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 102,155 |
| Provinces of China | 0 | - | 4.97 | 208,885 |
| China Cities Map Quiz | 0 | - | 4.94 | 106,038 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 94,839 |
| Japanese Prefectures | 0 | - | 4.98 | 139,423 |
| Japan Country Quiz | 0 | - | 4.93 | 143,530 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 33,445 |
| States of India | 0 | - | 4.94 | 196,522 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,705 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,656 |
| Nepal Country Quiz | 0 | - | 4.95 | 38,027 |
| African Countries with the Most Christians | 0 | - | 4.94 | 76,218 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,493 |
| Battle to Country | 0 | - | 4.91 | 54,121 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 62,110 |
| Arms Exports - United States | 0 | - | 4.77 | 62,806 |
| The American Civil War | 0 | - | 4.62 | 52,660 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 151,431 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,425 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 91,278 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,692 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.46 | 26,968 |
| The Trojan War | 0 | - | 4.83 | 40,074 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 652,999 |
| Name that Greek Letter | 0 | - | 4.93 | 325,298 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 113,225 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,696 |
| Roman Emperors | 0 | - | 4.95 | 121,448 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,752 |
| Countries Bordering Iran | 0 | - | 4.83 | 96,163 |
| History of Iran | 0 | - | 4.66 | 16,439 |
| Countries that Border Iraq | 0 | - | 4.97 | 109,207 |
| Countries Closest to Turkey | 0 | - | 4.96 | 127,031 |
| Countries Bordering Turkey | 0 | - | 4.98 | 117,979 |
| History of Egypt | 0 | - | 4.58 | 24,114 |
| Egypt Country Quiz | 0 | - | 4.82 | 78,017 |
| Countries Bordering Saudi Arabia | 0 | - | 4.96 | 133,923 |
| Countries Closest to Yemen | 0 | - | 4.92 | 22,828 |
| Oman Country Quiz | 0 | - | 4.86 | 27,116 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 56,274 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 105,170 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,584 |
| Countries Closest to Vietnam | 0 | - | 4.96 | 94,471 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 78,272 |
| Brunei Country Quiz | 0 | - | 4.87 | 22,108 |
| Chinese Inventions | 0 | - | 4.30 | 33,873 |
| History of China | 0 | - | 4.35 | 57,679 |
| China A-Z | 0 | - | 4.55 | 67,747 |
| Countries that Beat China | 0 | - | 4.85 | 116,986 |
| Countries that Border China | 0 | - | 4.96 | 264,553 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,949 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,639 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,314 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,388 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,837 |
| Bhutan Country Quiz | 0 | - | 4.87 | 24,367 |
| States of India Map Quiz | 0 | - | 4.85 | 26,973 |
| History of India | 0 | - | 4.62 | 21,527 |
| Countries Bordering India | 0 | - | 4.98 | 163,903 |
| Countries Closest to India | 0 | - | 4.97 | 103,337 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 77,142 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 230,634 |
| Countries in World War I | 0 | - | 4.88 | 229,461 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,605 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,884 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,903 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,346 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,760 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,833 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,219 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,828 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,207 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 72,139 |
| Countries of the German Empire | 0 | - | 4.51 | 38,311 |
| Olympian Gods Quiz | 0 | - | 4.96 | 504,464 |
| Ancient Greek Words | 0 | - | 4.93 | 112,668 |
| Roman to Greek God | 0 | - | 4.52 | 123,482 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 108,938 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 54,033 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 81,091 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 192,188 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 390,579 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,850 |
| Countries and States in the Caucasus | 0 | - | 4.46 | 51,877 |
| Asian Countries by Borders in 30 Seconds | 0 | - | 4.45 | 418,246 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,171 |
| The Only Remaining Asian Country . . . | 0 | - | 4.64 | 46,180 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,624 |
| Middle Eastern Geography Quiz | 0 | - | 4.57 | 44,273 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,283 |
| Ottoman Empire Quiz | 0 | - | 4.37 | 17,239 |
| Countries Surrounding Istanbul | 0 | - | 4.89 | 24,992 |
| Countries Closest to Egypt | 0 | - | 4.83 | 101,674 |
| Countries that Beat Egypt | 0 | - | 4.91 | 67,235 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,934 |
| Countries Closest to Israel | 0 | - | 4.69 | 106,895 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,590 |
| The Life of Gandhi | 0 | - | 4.37 | 13,087 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 49,084 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,363 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,163 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,876 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 194,035 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,501 |
| Europe Map Quiz | 0 | - | 5.00 | 4,793,577 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 533,072 |
| History of Russia Quiz | 0 | - | 4.47 | 32,026 |
| History of France | 0 | - | 4.61 | 57,729 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,666 |
| Mythology A-Z | 0 | - | 4.31 | 37,451 |
| History of Italy | 0 | - | 4.55 | 32,185 |
| Countries of the Italian Empire | 0 | - | 4.21 | 27,855 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 127,067 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 104,161 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,851 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,470 |
| Arthurian Legend | 0 | - | 4.33 | 25,194 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,148 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,490 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,380 |
| Geography of the British Empire | 0 | - | 4.48 | 39,880 |
| Asian Islands | 0 | - | 4.49 | 20,921 |
| Asian Geography By Letter - A | 0 | - | 4.64 | 71,530 |
| Asian Geography by Letter - H | 0 | - | 4.50 | 66,142 |
| Asian Geography By Letter - M | 0 | - | 4.48 | 61,717 |
| Asian Geography by Letter - P | 0 | - | 4.45 | 58,278 |
| Asian Geography by Letter - T | 0 | - | 4.52 | 57,718 |
| Asian Physical Geography | 0 | - | 4.61 | 35,643 |
| Asia Geography Quiz #1 | 0 | - | 4.70 | 53,692 |
| Asia Geography Quiz #2 | 0 | - | 4.56 | 48,770 |
