| All Countries by Population With a Map | 106,459 | 0 | - |
| US States Quiz | 16,684,217 | 0 | - |
| Countries of the World Quiz | 46,868,548 | 0 | - |
| U.S. Presidents Quiz | 3,649,973 | 0 | - |
| Countries that Start with A | 2,145,184 | 0 | - |
| Countries that Start with B | 2,278,454 | 0 | - |
| Countries that Start with C | 1,809,153 | 0 | - |
| Countries that Start with D | 700,757 | 0 | - |
| Countries that Start with E | 1,366,590 | 0 | - |
| Countries that Start with F | 611,641 | 0 | - |
| Countries that Start with G | 1,491,792 | 0 | - |
| Countries that Start with H | 597,273 | 0 | - |
| Countries that Start with I | 1,279,463 | 0 | - |
| Countries that Start with J | 595,353 | 0 | - |
| Countries that Start with K | 808,795 | 0 | - |
| Countries that Start with L | 1,082,176 | 0 | - |
| Countries that Start with M | 1,372,527 | 0 | - |
| Countries that Start with N | 1,109,034 | 0 | - |
| Countries that Start with O | 309,397 | - | - |
| Countries that Start with P | 1,207,861 | 0 | - |
| Countries that Start with Q | 280,966 | - | - |
| Countries that Start with R | 443,238 | 0 | - |
| Countries that Start with S | 1,743,521 | 0 | - |
| Countries that Start with T | 1,003,635 | 0 | - |
| Countries that Start with U | 899,483 | 0 | - |
| Countries that Start with V | 604,684 | 0 | - |
| Countries that Start with Y | 247,588 | - | - |
| Countries that Start with Z | 249,815 | - | - |
| Elements of the Periodic Table | 2,218,042 | 0 | - |
| Flags of Europe Quiz | 1,224,720 | 0 | - |
| Flags of North and South America | 366,047 | 0 | - |
| Flags of the Mediterranean | 147,416 | 0 | - |
| Flags of Oceania | 254,775 | 0 | - |
| Flags of Asia Quiz | 604,743 | 0 | - |
| Flags of Africa Quiz | 462,512 | 0 | - |
| Countries of the World in 1945 with a Map | 148,644 | 0 | - |
| Countries of the World in 1914 with a Map | 192,960 | 0 | - |
| European Countries NOT in NATO | 59,364 | 0 | - |
| Countries of the World in 1900 | 83,359 | 0 | - |
