| Countries of the Japanese Empire | 0 | - | 4.97 | 104,487 |
| Countries of Europe After World War II | 0 | - | 4.99 | 189,117 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 157,214 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 162,089 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 191,580 |
| Prime Ministers of the UK | 0 | - | 4.95 | 441,468 |
| Asian Countries with the Most Christians | 0 | - | 4.86 | 97,774 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 107,346 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,565 |
| Byzantine History | 0 | - | 4.91 | 28,992 |
| Byzantine Emperors | 0 | - | 4.92 | 14,515 |
| The Vietnam War | 0 | - | 4.44 | 35,624 |
| Countries with the Most Hindus | 0 | - | 4.90 | 123,428 |
| Hindu Countries | 0 | - | 4.87 | 50,477 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 439,119 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 56,416 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,451,160 |
| Asia Map Quiz | 0 | - | 4.99 | 923,191 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,386,301 |
| The Iraq War | 0 | - | 4.47 | 15,692 |
| The American Revolution | 0 | - | 4.52 | 54,326 |
| Countries of the Soviet Union | 0 | - | 4.98 | 195,400 |
| Soviet Union Country Quiz | 0 | - | 4.91 | 81,040 |
| The Reign of Napoleon | 0 | - | 4.54 | 39,091 |
| States of the German Confederation in 1848 | 0 | - | 4.90 | 32,343 |
| Figures from Greek Mythology | 0 | - | 4.91 | 188,396 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,864 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,645 |
| Flags of Asia Quiz | 0 | - | 4.99 | 618,406 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 110,634 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 154,370 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 99,729 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 109,004 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 127,592 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 108,126 |
| Top Asian Languages on a Map | 0 | - | 4.95 | 71,900 |
| South and Central Asia Map Quiz | 0 | - | 4.94 | 99,697 |
| Countries of Asia with an Empty Map | 0 | - | 4.98 | 231,282 |
| All First-Level Subdivisions of Asia on a Map | 0 | - | 4.91 | 50,427 |
| Countries of the Middle East | 0 | - | 4.96 | 202,293 |
| Prime Ministers of Australia | 0 | - | 4.51 | 32,152 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,719,221 |
| Canadian Prime Ministers | 0 | - | 4.64 | 57,814 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 200,305 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 151,102 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 84,733 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 65,517 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 71,641 |
| Soviet Leaders 1917–1991 | 0 | - | 4.44 | 95,416 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 145,358 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 118,477 |
| Name the English Monarchs | 0 | - | 4.91 | 505,483 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,886 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 106,614 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 123,642 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 135,902 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 136,616 |
| Pixelated Asia Map | 0 | - | 4.90 | 73,641 |
| Monarchies of Asia | 0 | - | 4.97 | 71,396 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.86 | 110,801 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 97,466 |
| Name a Valid Asian Country | 0 | - | 4.98 | 121,585 |
| Asian Country Superlatives | 0 | - | 4.84 | 81,195 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,628 |
| Qatar Country Quiz | 0 | - | 4.86 | 31,659 |
| The Persian Gulf War | 0 | - | 4.02 | 8,474 |
| Provinces of Turkey | 0 | - | 4.94 | 205,447 |
| Jordan Country Quiz | 0 | - | 4.86 | 32,017 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 80,656 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,915 |
| Provinces of China | 0 | - | 4.97 | 207,077 |
| China Cities Map Quiz | 0 | - | 4.94 | 105,732 |
| Provinces of China Map Quiz | 0 | - | 4.92 | 94,481 |
| Japanese Prefectures | 0 | - | 4.98 | 138,506 |
| Japan Country Quiz | 0 | - | 4.93 | 143,113 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 33,226 |
| States of India | 0 | - | 4.95 | 195,237 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,606 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 58,499 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,916 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,959 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 121,092 |
| Battle to Country | 0 | - | 4.91 | 53,769 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,884 |
| Arms Exports - United States | 0 | - | 4.77 | 62,645 |
| The American Civil War | 0 | - | 4.62 | 52,587 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 150,526 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 73,153 |
| Category Elimination - European Countries #1 | 0 | - | 4.90 | 90,819 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,613 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,909 |
| The Trojan War | 0 | - | 4.83 | 39,936 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 650,781 |
| Name that Greek Letter | 0 | - | 4.93 | 324,695 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 112,695 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 85,493 |
| Roman Emperors | 0 | - | 4.95 | 120,915 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.92 | 96,615 |
| Countries Bordering Iran | 0 | - | 4.83 | 95,944 |
| History of Iran | 0 | - | 4.66 | 16,406 |
| Countries that Border Iraq | 0 | - | 4.97 | 109,001 |
| Countries Closest to Turkey | 0 | - | 4.96 | 126,789 |
| Countries Bordering Turkey | 0 | - | 4.98 | 117,782 |
| History of Egypt | 0 | - | 4.58 | 24,088 |
| Egypt Country Quiz | 0 | - | 4.83 | 77,842 |
| Countries Bordering Saudi Arabia | 0 | - | 4.96 | 133,584 |
| Countries Closest to Yemen | 0 | - | 4.92 | 22,721 |
| Oman Country Quiz | 0 | - | 4.86 | 27,039 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 56,000 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,928 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 56,338 |
| Countries Closest to Vietnam | 0 | - | 4.96 | 94,289 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 78,078 |
| Brunei Country Quiz | 0 | - | 4.87 | 22,045 |
| Chinese Inventions | 0 | - | 4.30 | 33,846 |
| History of China | 0 | - | 4.35 | 57,477 |
| China A-Z | 0 | - | 4.55 | 67,524 |
| Countries that Beat China | 0 | - | 4.85 | 116,527 |
| Countries that Border China | 0 | - | 4.96 | 263,999 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,725 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 60,432 |
| Countries Closest to Japan | 0 | - | 4.92 | 139,059 |
| Closest Countries to North Korea | 0 | - | 4.94 | 123,125 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 93,620 |
| Bhutan Country Quiz | 0 | - | 4.87 | 24,315 |
| States of India Map Quiz | 0 | - | 4.84 | 26,806 |
| History of India | 0 | - | 4.62 | 21,490 |
| Countries Bordering India | 0 | - | 4.98 | 163,724 |
| Countries Closest to India | 0 | - | 4.97 | 103,118 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 76,747 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 229,807 |
| Countries in World War I | 0 | - | 4.88 | 228,855 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,488 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 428,003 |
| First Names of U.S. Presidents | 0 | - | 4.86 | 383,179 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,328 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 222,066 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 135,309 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,696 |
| Arms Exports - Russia | 0 | - | 4.49 | 25,175 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,863 |
| Countries of the German Empire | 0 | - | 4.51 | 38,118 |
| Olympian Gods Quiz | 0 | - | 4.96 | 503,038 |
| Ancient Greek Words | 0 | - | 4.93 | 112,262 |
| Roman to Greek God | 0 | - | 4.52 | 123,218 |
| Countries Closest to Spain A-Z | 0 | - | 4.98 | 108,630 |
| Biggest Trading Partners - Spain | 0 | - | 4.92 | 53,926 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 80,781 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 191,462 |
| Shakespeare's Plays Quiz | 0 | - | 4.37 | 389,480 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,772 |
| Countries and States in the Caucasus | 0 | - | 4.46 | 51,737 |
| Asian Countries by Borders in 30 Seconds | 0 | - | 4.45 | 417,247 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 26,102 |
| The Only Remaining Asian Country . . . | 0 | - | 4.64 | 46,052 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,601 |
| Middle Eastern Geography Quiz | 0 | - | 4.57 | 44,102 |
| Biggest Trading Partners - Turkey | 0 | - | 4.81 | 51,089 |
| Ottoman Empire Quiz | 0 | - | 4.37 | 17,199 |
| Countries Surrounding Istanbul | 0 | - | 4.89 | 24,939 |
| Countries Closest to Egypt | 0 | - | 4.83 | 101,463 |
| Countries that Beat Egypt | 0 | - | 4.91 | 66,573 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,891 |
| Countries Closest to Israel | 0 | - | 4.69 | 106,409 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 75,420 |
| The Life of Gandhi | 0 | - | 4.37 | 13,070 |
| Midwestern States of the U.S. | 0 | - | 4.88 | 14,063 |
| Biggest Axis-Controlled Cities | 0 | - | 4.44 | 48,996 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,352 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 29,132 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.50 | 11,853 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 193,380 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,407 |
| Europe Map Quiz | 0 | - | 5.00 | 4,781,130 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 531,764 |
| History of Russia Quiz | 0 | - | 4.47 | 31,986 |
| History of France | 0 | - | 4.61 | 57,476 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,516 |
| Mythology A-Z | 0 | - | 4.31 | 37,352 |
| History of Italy | 0 | - | 4.55 | 32,113 |
| Countries of the Italian Empire | 0 | - | 4.21 | 27,796 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 126,531 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.27 | 103,531 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,784 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,383 |
| Arthurian Legend | 0 | - | 4.33 | 25,158 |
| Invasions of Great Britain | 0 | - | 4.51 | 60,043 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,439 |
| Countries the UK Declared War On | 0 | - | 4.55 | 123,122 |
| Geography of the British Empire | 0 | - | 4.48 | 39,818 |
| Asian Islands | 0 | - | 4.49 | 20,887 |
| Asian Geography By Letter - A | 0 | - | 4.64 | 71,368 |
| Asian Geography by Letter - H | 0 | - | 4.50 | 65,963 |
| Asian Geography By Letter - M | 0 | - | 4.48 | 61,587 |
| Asian Geography by Letter - P | 0 | - | 4.45 | 58,110 |
| Asian Geography by Letter - T | 0 | - | 4.52 | 57,577 |
| Asian Physical Geography | 0 | - | 4.61 | 35,597 |
| Asia Geography Quiz #1 | 0 | - | 4.70 | 53,621 |
| Asia Geography Quiz #2 | 0 | - | 4.56 | 48,688 |
| Asia Geography Quiz #3 | 0 | - | 4.49 | 32,333 |
