| All Countries by Population With a Map | 108,688 | 0 | - |
| US States Quiz | 16,846,101 | 0 | - |
| Countries of the World Quiz | 47,367,185 | 0 | - |
| U.S. Presidents Quiz | 3,691,492 | 0 | - |
| Countries that Start with A | 2,159,998 | 0 | - |
| Countries that Start with B | 2,291,858 | 0 | - |
| Countries that Start with C | 1,819,987 | 0 | - |
| Countries that Start with D | 708,162 | 0 | - |
| Countries that Start with E | 1,375,496 | 0 | - |
| Countries that Start with F | 616,654 | 0 | - |
| Countries that Start with G | 1,501,198 | 0 | - |
| Countries that Start with H | 603,553 | 0 | - |
| Countries that Start with I | 1,286,666 | 0 | - |
| Countries that Start with J | 601,360 | 0 | - |
| Countries that Start with K | 814,700 | 0 | - |
| Countries that Start with L | 1,089,405 | 0 | - |
| Countries that Start with M | 1,380,194 | 0 | - |
| Countries that Start with N | 1,116,390 | 0 | - |
| Countries that Start with O | 312,295 | - | - |
| Countries that Start with P | 1,214,855 | 0 | - |
| Countries that Start with Q | 283,257 | - | - |
| Countries that Start with R | 446,915 | 0 | - |
| Countries that Start with S | 1,753,020 | 0 | - |
| Countries that Start with T | 1,008,837 | 0 | - |
| Countries that Start with U | 903,677 | 0 | - |
| Countries that Start with V | 608,695 | 0 | - |
| Countries that Start with Y | 249,416 | - | - |
| Countries that Start with Z | 251,702 | - | - |
| Elements of the Periodic Table | 2,239,026 | 0 | - |
| Flags of Europe Quiz | 1,241,425 | 0 | - |
| Flags of North and South America | 372,332 | 0 | - |
| Flags of the Mediterranean | 148,372 | 0 | - |
| Flags of Oceania | 258,493 | 0 | - |
| Flags of Asia Quiz | 612,257 | 0 | - |
| Flags of Africa Quiz | 469,947 | 0 | - |
| Countries of the World in 1945 with a Map | 150,530 | 0 | - |
| Countries of the World in 1914 with a Map | 194,894 | 0 | - |
| European Countries NOT in NATO | 60,892 | 0 | - |
| Countries of the World in 1900 | 84,690 | 0 | - |
