| Countries of the Japanese Empire | 0 | - | 4.97 | 103,997 |
| Countries of Europe After World War II | 0 | - | 4.99 | 187,492 |
| Countries of Europe Before World War I | 0 | - | 4.99 | 155,770 |
| Neutral European Countries of WWII | 0 | - | 4.91 | 160,824 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,222 |
| Deadliest U.S. Wars | 0 | - | 4.89 | 189,645 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,213 |
| Asian Countries with the Most Christians | 0 | - | 4.85 | 96,604 |
| Countries with the Most Hindus | 0 | - | 4.90 | 122,575 |
| Hindu Countries | 0 | - | 4.86 | 49,775 |
| Countries Italy Declared War On | 0 | - | 4.75 | 43,111 |
| Byzantine History | 0 | - | 4.91 | 28,678 |
| The Vietnam War | 0 | - | 4.43 | 35,374 |
| Roman Numeral Decoding Quiz | 0 | - | 4.94 | 434,797 |
| Two Letter Roman Numerals | 0 | - | 4.97 | 55,783 |
| East Asia Map Quiz | 0 | - | 4.99 | 1,443,332 |
| Asia Map Quiz | 0 | - | 4.99 | 909,963 |
| Middle East Map Quiz | 0 | - | 4.99 | 1,378,630 |
| The Iraq War | 0 | - | 4.47 | 15,584 |
| The American Revolution | 0 | - | 4.52 | 54,126 |
| Countries of the Soviet Union | 0 | - | 4.98 | 194,136 |
| Soviet Union Country Quiz | 0 | - | 4.90 | 80,422 |
| The Reign of Napoleon | 0 | - | 4.54 | 38,803 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,706 |
| Figures from Greek Mythology | 0 | - | 4.91 | 185,640 |
| The Life of Winston Churchill | 0 | - | 4.16 | 11,824 |
| Places Where Winston Churchill Said We Would Fight the Nazis | 0 | - | 4.57 | 14,573 |
| Flags of Asia Quiz | 0 | - | 4.99 | 608,175 |
| East Asia Cities Map Quiz | 0 | - | 4.96 | 109,757 |
| 10 Biggest Asian Countries by Area | 0 | - | 4.97 | 153,124 |
| 10 Southernmost Countries in Asia | 0 | - | 4.97 | 98,664 |
| 10 Easternmost Countries in Asia | 0 | - | 4.99 | 107,520 |
| Countries of Asia with Two or More Words | 0 | - | 4.96 | 126,168 |
| Asian Countries Ending in "IA" | 0 | - | 4.96 | 106,872 |
| Top Asian Languages on a Map | 0 | - | 4.95 | 70,944 |
| South and Central Asia Map Quiz | 0 | - | 4.93 | 98,065 |
| Countries of Asia with an Empty Map | 0 | - | 4.98 | 229,417 |
| All First-Level Subdivisions of Asia on a Map | 0 | - | 4.93 | 49,407 |
| Countries of the Middle East | 0 | - | 4.96 | 199,663 |
| Countries Kim Jong Un Has Been To | 0 | - | 4.95 | 32,450 |
| Kazakhstan Country Quiz | 0 | - | 4.79 | 35,476 |
| States of India | 0 | - | 4.94 | 191,357 |
| Countries that Bordered British India with an Empty Map | 0 | - | 4.69 | 55,276 |
| Countries with the Most Ascents of Mount Everest | 0 | - | 4.95 | 57,934 |
| Nepal Country Quiz | 0 | - | 4.95 | 37,490 |
| African Countries with the Most Christians | 0 | - | 4.94 | 75,095 |
| Top 10 Biggest Economies in Africa | 0 | - | 4.99 | 119,678 |
| Prime Ministers of Australia | 0 | - | 4.50 | 31,764 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,669,897 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,237 |
| Top 10 Biggest Economies in Europe | 0 | - | 4.98 | 197,895 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,408 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,759 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,864 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,410 |
| Soviet Leaders 1917–1991 | 0 | - | 4.43 | 94,628 |
| Modern Day Countries of Nazi Germany on a Map | 0 | - | 4.97 | 143,701 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,718 |
| Name the English Monarchs | 0 | - | 4.92 | 499,596 |
| Asian Geography By Letter - B | 0 | - | 4.85 | 66,154 |
| 10 Asian Countries with the Most Tourists | 0 | - | 4.89 | 105,403 |
| Top 10 Coldest Asian Countries | 0 | - | 4.95 | 122,642 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,696 |
| Top 10 Biggest Economies in Asia | 0 | - | 4.87 | 118,411 |
| Pixelated Asia Map | 0 | - | 4.90 | 72,708 |
| Monarchies of Asia | 0 | - | 4.97 | 70,770 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,167 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,949 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,376 |
| Asian Country Superlatives | 0 | - | 4.83 | 80,577 |
| Countries Closest to the Persian Gulf | 0 | - | 4.93 | 83,118 |
| The Persian Gulf War | 0 | - | 4.02 | 8,421 |
| Provinces of Turkey | 0 | - | 4.95 | 202,633 |
| Syria Country Quiz | 0 | - | 4.81 | 32,508 |
| Countries with the Most Arabic Speakers | 0 | - | 4.92 | 79,688 |
| Countries in Southeast Asia With an Empty Map | 0 | - | 4.97 | 101,025 |
| Provinces of China | 0 | - | 4.97 | 201,600 |
| China Cities Map Quiz | 0 | - | 4.93 | 104,548 |
| Provinces of China Map Quiz | 0 | - | 4.91 | 93,081 |
| Japanese Prefectures | 0 | - | 4.98 | 135,433 |
| Japan Country Quiz | 0 | - | 4.92 | 141,769 |
| Battle to Country | 0 | - | 4.91 | 52,805 |
| Closest Countries to North Korea | 0 | - | 4.94 | 122,026 |
| Countries Closest to Taiwan | 0 | - | 4.81 | 92,973 |
| Bhutan Country Quiz | 0 | - | 4.87 | 24,097 |
| States of India Map Quiz | 0 | - | 4.82 | 26,188 |
| History of India | 0 | - | 4.61 | 21,331 |
| Countries Bordering India | 0 | - | 4.98 | 163,141 |
| Countries Closest to India | 0 | - | 4.97 | 102,417 |
| Top 10 Richest Countries in Africa | 0 | - | 4.85 | 75,443 |
| Biggest Trading Partners – Australia | 0 | - | 4.93 | 61,165 |
| Arms Exports - United States | 0 | - | 4.75 | 61,634 |
| The American Civil War | 0 | - | 4.62 | 52,249 |
| Top 10 Richest Countries in Europe | 0 | - | 4.90 | 148,634 |
| Biggest Trading Partners - European Union | 0 | - | 4.91 | 72,346 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,368 |
| The Dictator Files: Joseph Stalin | 0 | - | 4.37 | 48,372 |
| The Dictator Files: Vladimir Lenin | 0 | - | 4.45 | 26,699 |
| The Trojan War | 0 | - | 4.83 | 39,534 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,990 |
| Name that Greek Letter | 0 | - | 4.93 | 322,323 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,033 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,227 |
| Roman Emperors | 0 | - | 4.95 | 119,044 |
| Top 10 Asian Countries by Coastline | 0 | - | 4.91 | 96,259 |
| Qatar Country Quiz | 0 | - | 4.85 | 31,377 |
| Countries Bordering Iran | 0 | - | 4.83 | 94,973 |
| History of Iran | 0 | - | 4.66 | 16,298 |
| Countries that Border Iraq | 0 | - | 4.97 | 108,020 |
| Countries Closest to Turkey | 0 | - | 4.96 | 125,618 |
| Countries Bordering Turkey | 0 | - | 4.98 | 116,735 |
| Ottoman Empire Quiz | 0 | - | 4.42 | 17,066 |
| History of Egypt | 0 | - | 4.58 | 23,973 |
| Egypt Country Quiz | 0 | - | 4.82 | 77,203 |
| Countries Bordering Saudi Arabia | 0 | - | 4.95 | 118,359 |
| Countries Closest to Yemen | 0 | - | 4.91 | 22,401 |
| Oman Country Quiz | 0 | - | 4.86 | 26,771 |
| Countries Closest to Cyprus | 0 | - | 4.91 | 55,132 |
| Jordan Country Quiz | 0 | - | 4.86 | 31,522 |
| Countries Closest to Indonesia | 0 | - | 4.97 | 104,190 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,437 |
| Countries Closest to Vietnam | 0 | - | 4.95 | 93,656 |
| Countries Bordering Myanmar | 0 | - | 4.87 | 77,234 |
| Brunei Country Quiz | 0 | - | 4.87 | 21,821 |
| Chinese Inventions | 0 | - | 4.30 | 33,746 |
| History of China | 0 | - | 4.37 | 56,862 |
| China A-Z | 0 | - | 4.55 | 66,916 |
| Countries that Beat China | 0 | - | 4.86 | 115,084 |
| Countries that Border China | 0 | - | 4.96 | 262,346 |
| Countries that Visit Japan the Most | 0 | - | 4.93 | 77,129 |
| Most-Visited Countries by Japanese | 0 | - | 4.95 | 59,866 |
| Countries Closest to Japan | 0 | - | 4.92 | 138,153 |
| Axis Occupied Countries of WWII | 0 | - | 4.99 | 228,031 |
| Countries in World War I | 0 | - | 4.88 | 227,227 |
| The Life of Gandhi | 0 | - | 4.37 | 13,027 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,085 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 424,678 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 380,187 |
| U.S. Civil War Decoder | 0 | - | 4.14 | 25,214 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,322 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,106 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,267 |
| Arms Exports - Russia | 0 | - | 4.48 | 25,067 |
| Biggest Trading Partners - Germany | 0 | - | 4.97 | 71,016 |
| Countries of the German Empire | 0 | - | 4.51 | 37,761 |
| Olympian Gods Quiz | 0 | - | 4.96 | 497,878 |
| Ancient Greek Words | 0 | - | 4.93 | 111,016 |
| Roman to Greek God | 0 | - | 4.52 | 122,432 |
| Countries Closest to Spain A-Z | 0 | - | 4.99 | 107,884 |
| Biggest Trading Partners - Spain | 0 | - | 4.91 | 53,606 |
| Biggest Trading Partners – United Kingdom | 0 | - | 4.93 | 79,806 |
| Countries Closest to the United Kingdom A-Z | 0 | - | 4.96 | 190,263 |
| Shakespeare's Plays Quiz | 0 | - | 4.38 | 386,562 |
| The Thirteen Dwarves in the Hobbit | 0 | - | 4.81 | 28,440 |
| Countries and States in the Caucasus | 0 | - | 4.46 | 51,299 |
| Asian Countries by Borders in 30 Seconds | 0 | - | 4.45 | 413,664 |
| Turkmenistan Country Quiz | 0 | - | 4.81 | 25,823 |
| The Only Remaining Asian Country . . . | 0 | - | 4.69 | 45,562 |
| Countries that Have Controlled Mesopotamia | 0 | - | 4.15 | 15,512 |
| Middle Eastern Geography Quiz | 0 | - | 4.57 | 43,464 |
| Countries Surrounding Istanbul | 0 | - | 4.89 | 24,761 |
| Countries Closest to Egypt | 0 | - | 4.83 | 100,711 |
| Countries that Beat Egypt | 0 | - | 4.88 | 56,731 |
| 10 Plagues of Egypt | 0 | - | 4.41 | 53,665 |
| Countries Closest to Israel | 0 | - | 4.67 | 105,385 |
| Biggest Trading Partners - China | 0 | - | 4.95 | 74,815 |
| Biggest Axis-Controlled Cities | 0 | - | 4.43 | 48,712 |
| Mongolia Country Quiz | 0 | - | 4.73 | 39,379 |
| Taiwan Country Quiz | 0 | - | 4.69 | 43,347 |
| Afghanistan Country Quiz | 0 | - | 4.45 | 43,041 |
| Bangladesh Country Quiz | 0 | - | 4.78 | 42,909 |
| Pakistan Country Quiz | 0 | - | 4.54 | 61,457 |
| India Country Quiz | 0 | - | 4.44 | 129,981 |
| India Cities Map Quiz | 0 | - | 4.63 | 60,842 |
| Countries of the Indian Diaspora | 0 | - | 4.48 | 57,194 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,147 |
| African Countries with the Most Muslims | 0 | - | 4.80 | 100,587 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,312 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,939 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,692 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 190,502 |
| States in a Tank of the U.S. Map | 0 | - | 4.47 | 31,117 |
| Europe Map Quiz | 0 | - | 5.00 | 4,742,327 |
| European Countries by First 2 Letters | 0 | - | 4.95 | 527,349 |
| History of Russia Quiz | 0 | - | 4.49 | 31,829 |
| History of France | 0 | - | 4.59 | 56,500 |
| Countries Closest to Germany A-Z | 0 | - | 4.98 | 27,063 |
| Mythology A-Z | 0 | - | 4.31 | 37,081 |
| History of Italy | 0 | - | 4.55 | 31,879 |
| Countries of the Italian Empire | 0 | - | 4.21 | 27,597 |
| Modern-Day Countries of the Roman Empire on a Map | 0 | - | 4.99 | 125,113 |
| Count in Roman Numerals - 30 Second Sprint | 0 | - | 4.26 | 101,928 |
| Geography of the Dutch Empire | 0 | - | 4.62 | 34,545 |
| Countries of the Spanish Empire | 0 | - | 4.52 | 77,070 |
| Arthurian Legend | 0 | - | 4.33 | 25,070 |
| Invasions of Great Britain | 0 | - | 4.51 | 59,684 |
| Wives of King Henry VIII | 0 | - | 4.55 | 53,254 |
| Countries the UK Declared War On | 0 | - | 4.61 | 122,042 |
| Geography of the British Empire | 0 | - | 4.48 | 39,564 |
| Asian Islands | 0 | - | 4.49 | 20,792 |
