| Countries of the Japanese Empire | 0 | - | 4.97 | 104,181 |
| Countries of Europe After World War II | 0 | - | 4.99 | 188,094 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 156,280 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 161,279 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,640 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 190,560 |
| Prime Ministers of the UK | 0 | - | 4.95 | 437,999 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 97,055 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,861 |
| Hindu Countries | 0 | - | 4.86 | 50,020 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,261 |
| Byzantine History | 0 | - | 4.91 | 28,760 |
| The Vietnam War | 0 | - | 4.44 | 35,488 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 436,422 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,019 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,446,897 |
| Asia Map Quiz | 0 | - | 4.99 | 914,835 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,381,475 |
| The Iraq War | 0 | - | 4.47 | 15,641 |
| The American Revolution | 0 | - | 4.52 | 54,220 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,446 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,628 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,909 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,891 |
| Figures from Greek Mythology | 0 | - | 4.91 | 186,510 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,838 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,597 |
| Flags of Asia Quiz | 0 | - | 4.99 | 611,650 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,103 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 153,560 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 98,992 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 107,836 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 126,685 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 107,306 |
| Top Asian Languages on a Map | 0 | - | 4.95 | 71,288 |
| South and Central Asia Map Quiz | 0 | - | 4.94 | 98,694 |
| Countries of Asia with an Empty Map | 0 | - | 4.98 | 230,038 |
| All First-Level Subdivisions of Asia on a Map | 0 | - | 4.91 | 49,774 |
| Countries of the Middle East | 0 | - | 4.96 | 200,794 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,728 |
| States of India | 0 | - | 4.94 | 192,718 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,395 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,138 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,665 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,480 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 120,395 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,853 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,689,513 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,437 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 199,051 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,924 |
| Countries of Europe in 1848 | 0 | - | 4.99 | 76,155 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 64,319 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,730 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 94,858 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 144,332 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 117,269 |
| Name the English Monarchs | 0 | - | 4.91 | 501,669 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,416 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 105,803 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,864 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,086 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 132,315 |
| Pixelated Asia Map | 0 | - | 4.90 | 73,021 |
| Monarchies of Asia | 0 | - | 4.97 | 70,994 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,754 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 96,588 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,810 |
| Asian Country Superlatives | 0 | - | 4.84 | 80,786 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,296 |
| The Persian Gulf War | 0 | - | 4.02 | 8,445 |
| Provinces of Turkey | 0 | - | 4.95 | 203,722 |
| Syria Country Quiz | 0 | - | 4.81 | 32,684 |
| Jordan Country Quiz | 0 | - | 4.86 | 31,691 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 79,949 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,336 |
| Provinces of China | 0 | - | 4.97 | 203,612 |
| China Cities Map Quiz | 0 | - | 4.93 | 104,967 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 93,437 |
| Japanese Prefectures | 0 | - | 4.98 | 136,497 |
| Japan Country Quiz | 0 | - | 4.93 | 142,245 |
| Battle to Country | 0 | - | 4.91 | 53,169 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,278 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,196 |
| Bhutan Country Quiz | 0 | - | 4.87 | 24,187 |
| States of India Map Quiz | 0 | - | 4.83 | 26,419 |
| History of India | 0 | - | 4.61 | 21,401 |
| Countries Bordering India | 0 | - | 4.98 | 163,342 |
| Countries Closest to India | 0 | - | 4.97 | 102,657 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,131 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,452 |
| Arms Exports - United States | 0 | - | 4.75 | 62,287 |
| The American Civil War | 0 | - | 4.62 | 52,381 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 149,497 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,722 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,826 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,451 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,767 |
| The Trojan War | 0 | - | 4.83 | 39,657 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 646,265 |
| Name that Greek Letter | 0 | - | 4.93 | 323,130 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,570 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,431 |
| Roman Emperors | 0 | - | 4.95 | 119,685 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,392 |
| Topological Map of Asia Quiz | 0 | - | 4.81 | 20,105 |
| Qatar Country Quiz | 0 | - | 4.86 | 31,471 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,163 |
| History of Iran | 0 | - | 4.66 | 16,342 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,253 |
| Countries Closest to Turkey | 0 | - | 4.96 | 125,899 |
| Countries Bordering Turkey | 0 | - | 4.98 | 117,013 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,106 |
| History of Egypt | 0 | - | 4.58 | 24,011 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,425 |
| Countries Bordering Saudi Arabia | 0 | - | 4.95 | 118,536 |
| Countries Closest to Yemen | 0 | - | 4.91 | 22,501 |
| Oman Country Quiz | 0 | - | 4.86 | 26,865 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,432 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,433 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,706 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 93,865 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,437 |
| Brunei Country Quiz | 0 | - | 4.87 | 21,898 |
| Chinese Inventions | 0 | - | 4.30 | 33,785 |
| History of China | 0 | - | 4.37 | 57,070 |
| China A-Z | 0 | - | 4.55 | 67,141 |
| Countries that Beat China | 0 | - | 4.86 | 115,521 |
| Countries that Border China | 0 | - | 4.96 | 262,894 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,339 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,054 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,484 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,738 |
| Countries in World War I | 0 | - | 4.88 | 227,856 |
| The Life of Gandhi | 0 | - | 4.37 | 13,046 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,257 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 425,987 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 381,145 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,252 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 220,392 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,887 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 13,654 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,413 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,123 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,347 |
| Countries of the German Empire | 0 | - | 4.51 | 37,877 |
| Olympian Gods Quiz | 0 | - | 4.96 | 499,695 |
| Ancient Greek Words | 0 | - | 4.93 | 111,386 |
| Roman to Greek God | 0 | - | 4.52 | 122,668 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,138 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,741 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,202 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,666 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 387,578 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,617 |
| Countries and States in the Caucasus | 0 | - | 4.46 | 51,459 |
| Asian Countries by Borders in 30 Seconds | 0 | - | 4.45 | 414,686 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,928 |
| The Only Remaining Asian Country . . . | 0 | - | 4.64 | 45,736 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,549 |
| Middle Eastern Geography Quiz | 0 | - | 4.57 | 43,727 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 50,643 |
| Countries Surrounding Istanbul | 0 | - | 4.89 | 24,811 |
| Countries Closest to Egypt | 0 | - | 4.83 | 100,938 |
| Countries that Beat Egypt | 0 | - | 4.88 | 56,904 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,787 |
| Countries Closest to Israel | 0 | - | 4.67 | 105,589 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,088 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 48,837 |
| Mongolia Country Quiz | 0 | - | 4.73 | 39,490 |
| Taiwan Country Quiz | 0 | - | 4.69 | 43,467 |
| Afghanistan Country Quiz | 0 | - | 4.45 | 43,229 |
| Kazakhstan Country Quiz | 0 | - | 4.74 | 36,075 |
| Bangladesh Country Quiz | 0 | - | 4.78 | 43,050 |
| Pakistan Country Quiz | 0 | - | 4.54 | 61,664 |
| India Country Quiz | 0 | - | 4.44 | 130,379 |
| India Cities Map Quiz | 0 | - | 4.64 | 61,013 |
| Countries of the Indian Diaspora | 0 | - | 4.48 | 58,890 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,355 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,818 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,328 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,063 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,759 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 191,413 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,193 |
| Europe Map Quiz | 0 | - | 5.00 | 4,756,499 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 528,896 |
| History of Russia Quiz | 0 | - | 4.49 | 31,883 |
| History of France | 0 | - | 4.59 | 56,855 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,233 |
| Mythology A-Z | 0 | - | 4.31 | 37,177 |
| History of Italy | 0 | - | 4.55 | 31,937 |
| Countries of the Italian Empire | 0 | - | 4.21 | 27,668 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 125,597 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 102,583 |
| Geography of the Dutch Empire | 0 | - | 4.61 | 34,620 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,177 |
| Arthurian Legend | 0 | - | 4.33 | 25,099 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,805 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,309 |
